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Update Stockfish to development version from 2020-06-17

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This commit is contained in:
Peter Osterlund 2020-06-19 11:49:56 +02:00
parent a64eab03cc
commit 6bcbd6d080
34 changed files with 1445 additions and 885 deletions
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3
DroidFishApp/src/main/cpp/stockfish/Android.mk
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@ -2,7 +2,8 @@ LOCAL_PATH := $(call my-dir)
SF_SRC_FILES := \
benchmark.cpp main.cpp movegen.cpp pawns.cpp thread.cpp uci.cpp psqt.cpp \
bitbase.cpp endgame.cpp material.cpp movepick.cpp position.cpp timeman.cpp ucioption.cpp \
bitbase.cpp endgame.cpp material.cpp movepick.cpp position.cpp timeman.cpp \
tune.cpp ucioption.cpp \
bitboard.cpp evaluate.cpp misc.cpp search.cpp tt.cpp syzygy/tbprobe.cpp
MY_ARCH_DEF :=

1
DroidFishApp/src/main/cpp/stockfish/benchmark.cpp
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@ -65,6 +65,7 @@ const vector<string> Defaults = {
"4rrk1/1p1nq3/p7/2p1P1pp/3P2bp/3Q1Bn1/PPPB4/1K2R1NR w - - 40 21",
"r3k2r/3nnpbp/q2pp1p1/p7/Pp1PPPP1/4BNN1/1P5P/R2Q1RK1 w kq - 0 16",
"3Qb1k1/1r2ppb1/pN1n2q1/Pp1Pp1Pr/4P2p/4BP2/4B1R1/1R5K b - - 11 40",
"4k3/3q1r2/1N2r1b1/3ppN2/2nPP3/1B1R2n1/2R1Q3/3K4 w - - 5 1",
// 5-man positions
"8/8/8/8/5kp1/P7/8/1K1N4 w - - 0 1", // Kc2 - mate

66
DroidFishApp/src/main/cpp/stockfish/bitbase.cpp
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@ -19,8 +19,8 @@
*/
#include <cassert>
#include <numeric>
#include <vector>
#include <bitset>
#include "bitboard.h"
#include "types.h"
@ -31,8 +31,7 @@ namespace {
// Positions with the pawn on files E to H will be mirrored before probing.
constexpr unsigned MAX_INDEX = 2*24*64*64; // stm * psq * wksq * bksq = 196608
// Each uint32_t stores results of 32 positions, one per bit
uint32_t KPKBitbase[MAX_INDEX / 32];
std::bitset<MAX_INDEX> KPKBitbase;
// A KPK bitbase index is an integer in [0, IndexMax] range
//
@ -43,8 +42,8 @@ namespace {
// bit 12: side to move (WHITE or BLACK)
// bit 13-14: white pawn file (from FILE_A to FILE_D)
// bit 15-17: white pawn RANK_7 - rank (from RANK_7 - RANK_7 to RANK_7 - RANK_2)
unsigned index(Color us, Square bksq, Square wksq, Square psq) {
return int(wksq) | (bksq << 6) | (us << 12) | (file_of(psq) << 13) | ((RANK_7 - rank_of(psq)) << 15);
unsigned index(Color stm, Square bksq, Square wksq, Square psq) {
return int(wksq) | (bksq << 6) | (stm << 12) | (file_of(psq) << 13) | ((RANK_7 - rank_of(psq)) << 15);
}
enum Result {
@ -60,12 +59,9 @@ namespace {
KPKPosition() = default;
explicit KPKPosition(unsigned idx);
operator Result() const { return result; }
Result classify(const std::vector<KPKPosition>& db)
{ return us == WHITE ? classify<WHITE>(db) : classify<BLACK>(db); }
Result classify(const std::vector<KPKPosition>& db);
template<Color Us> Result classify(const std::vector<KPKPosition>& db);
Color us;
Color stm;
Square ksq[COLOR_NB], psq;
Result result;
};
@ -73,12 +69,11 @@ namespace {
} // namespace
bool Bitbases::probe(Square wksq, Square wpsq, Square bksq, Color us) {
bool Bitbases::probe(Square wksq, Square wpsq, Square bksq, Color stm) {
assert(file_of(wpsq) <= FILE_D);
unsigned idx = index(us, bksq, wksq, wpsq);
return KPKBitbase[idx / 32] & (1 << (idx & 0x1F));
return KPKBitbase[index(stm, bksq, wksq, wpsq)];
}
@ -97,10 +92,10 @@ void Bitbases::init() {
for (repeat = idx = 0; idx < MAX_INDEX; ++idx)
repeat |= (db[idx] == UNKNOWN && db[idx].classify(db) != UNKNOWN);
// Map 32 results into one KPKBitbase[] entry
// Fill the bitbase with the decisive results
for (idx = 0; idx < MAX_INDEX; ++idx)
if (db[idx] == WIN)
KPKBitbase[idx / 32] |= 1 << (idx & 0x1F);
KPKBitbase.set(idx);
}
@ -110,28 +105,28 @@ namespace {
ksq[WHITE] = Square((idx >> 0) & 0x3F);
ksq[BLACK] = Square((idx >> 6) & 0x3F);
us = Color ((idx >> 12) & 0x01);
stm = Color ((idx >> 12) & 0x01);
psq = make_square(File((idx >> 13) & 0x3), Rank(RANK_7 - ((idx >> 15) & 0x7)));
// Check if two pieces are on the same square or if a king can be captured
if ( distance(ksq[WHITE], ksq[BLACK]) <= 1
|| ksq[WHITE] == psq
|| ksq[BLACK] == psq
|| (us == WHITE && (PawnAttacks[WHITE][psq] & ksq[BLACK])))
|| (stm == WHITE && (pawn_attacks_bb(WHITE, psq) & ksq[BLACK])))
result = INVALID;
// Immediate win if a pawn can be promoted without getting captured
else if ( us == WHITE
else if ( stm == WHITE
&& rank_of(psq) == RANK_7
&& ksq[us] != psq + NORTH
&& ( distance(ksq[~us], psq + NORTH) > 1
|| (PseudoAttacks[KING][ksq[us]] & (psq + NORTH))))
&& ksq[stm] != psq + NORTH
&& ( distance(ksq[~stm], psq + NORTH) > 1
|| (attacks_bb<KING>(ksq[stm]) & (psq + NORTH))))
result = WIN;
// Immediate draw if it is a stalemate or a king captures undefended pawn
else if ( us == BLACK
&& ( !(PseudoAttacks[KING][ksq[us]] & ~(PseudoAttacks[KING][ksq[~us]] | PawnAttacks[~us][psq]))
|| (PseudoAttacks[KING][ksq[us]] & psq & ~PseudoAttacks[KING][ksq[~us]])))
else if ( stm == BLACK
&& ( !(attacks_bb<KING>(ksq[stm]) & ~(attacks_bb<KING>(ksq[~stm]) | pawn_attacks_bb(~stm, psq)))
|| (attacks_bb<KING>(ksq[stm]) & psq & ~attacks_bb<KING>(ksq[~stm]))))
result = DRAW;
// Position will be classified later
@ -139,7 +134,6 @@ namespace {
result = UNKNOWN;
}
template<Color Us>
Result KPKPosition::classify(const std::vector<KPKPosition>& db) {
// White to move: If one move leads to a position classified as WIN, the result
@ -151,27 +145,25 @@ namespace {
// of the current position is DRAW. If all moves lead to positions classified
// as WIN, the position is classified as WIN, otherwise the current position is
// classified as UNKNOWN.
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Result Good = (Us == WHITE ? WIN : DRAW);
constexpr Result Bad = (Us == WHITE ? DRAW : WIN);
const Result Good = (stm == WHITE ? WIN : DRAW);
const Result Bad = (stm == WHITE ? DRAW : WIN);
Result r = INVALID;
Bitboard b = PseudoAttacks[KING][ksq[Us]];
Bitboard b = attacks_bb<KING>(ksq[stm]);
while (b)
r |= Us == WHITE ? db[index(Them, ksq[Them] , pop_lsb(&b), psq)]
: db[index(Them, pop_lsb(&b), ksq[Them] , psq)];
r |= stm == WHITE ? db[index(BLACK, ksq[BLACK] , pop_lsb(&b), psq)]
: db[index(WHITE, pop_lsb(&b), ksq[WHITE], psq)];
if (Us == WHITE)
if (stm == WHITE)
{
if (rank_of(psq) < RANK_7) // Single push
r |= db[index(Them, ksq[Them], ksq[Us], psq + NORTH)];
r |= db[index(BLACK, ksq[BLACK], ksq[WHITE], psq + NORTH)];
if ( rank_of(psq) == RANK_2 // Double push
&& psq + NORTH != ksq[Us]
&& psq + NORTH != ksq[Them])
r |= db[index(Them, ksq[Them], ksq[Us], psq + NORTH + NORTH)];
&& psq + NORTH != ksq[WHITE]
&& psq + NORTH != ksq[BLACK])
r |= db[index(BLACK, ksq[BLACK], ksq[WHITE], psq + NORTH + NORTH)];
}
return result = r & Good ? Good : r & UNKNOWN ? UNKNOWN : Bad;

50
DroidFishApp/src/main/cpp/stockfish/bitboard.cpp
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@ -56,8 +56,9 @@ const std::string Bitboards::pretty(Bitboard b) {
for (File f = FILE_A; f <= FILE_H; ++f)
s += b & make_square(f, r) ? "| X " : "| ";
s += "|\n+---+---+---+---+---+---+---+---+\n";
s += "| " + std::to_string(1 + r) + "\n+---+---+---+---+---+---+---+---+\n";
}
s += " a b c d e f g h\n";
return s;
}
@ -69,7 +70,7 @@ const std::string Bitboards::pretty(Bitboard b) {
void Bitboards::init() {
for (unsigned i = 0; i < (1 << 16); ++i)
PopCnt16[i] = std::bitset<16>(i).count();
PopCnt16[i] = uint8_t(std::bitset<16>(i).count());
for (Square s = SQ_A1; s <= SQ_H8; ++s)
SquareBB[s] = (1ULL << s);
@ -78,28 +79,6 @@ void Bitboards::init() {
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
SquareDistance[s1][s2] = std::max(distance<File>(s1, s2), distance<Rank>(s1, s2));
for (Square s = SQ_A1; s <= SQ_H8; ++s)
{
PawnAttacks[WHITE][s] = pawn_attacks_bb<WHITE>(square_bb(s));
PawnAttacks[BLACK][s] = pawn_attacks_bb<BLACK>(square_bb(s));
}
// Helper returning the target bitboard of a step from a square
auto landing_square_bb = [&](Square s, int step)
{
Square to = Square(s + step);
return is_ok(to) && distance(s, to) <= 2 ? square_bb(to) : Bitboard(0);
};
for (Square s = SQ_A1; s <= SQ_H8; ++s)
{
for (int step : {-9, -8, -7, -1, 1, 7, 8, 9} )
PseudoAttacks[KING][s] |= landing_square_bb(s, step);
for (int step : {-17, -15, -10, -6, 6, 10, 15, 17} )
PseudoAttacks[KNIGHT][s] |= landing_square_bb(s, step);
}
Direction RookDirections[] = { NORTH, EAST, SOUTH, WEST };
Direction BishopDirections[] = { NORTH_EAST, SOUTH_EAST, SOUTH_WEST, NORTH_WEST };
@ -108,6 +87,15 @@ void Bitboards::init() {
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
{
PawnAttacks[WHITE][s1] = pawn_attacks_bb<WHITE>(square_bb(s1));
PawnAttacks[BLACK][s1] = pawn_attacks_bb<BLACK>(square_bb(s1));
for (int step : {-9, -8, -7, -1, 1, 7, 8, 9} )
PseudoAttacks[KING][s1] |= safe_destination(s1, step);
for (int step : {-17, -15, -10, -6, 6, 10, 15, 17} )
PseudoAttacks[KNIGHT][s1] |= safe_destination(s1, step);
PseudoAttacks[QUEEN][s1] = PseudoAttacks[BISHOP][s1] = attacks_bb<BISHOP>(s1, 0);
PseudoAttacks[QUEEN][s1] |= PseudoAttacks[ ROOK][s1] = attacks_bb< ROOK>(s1, 0);
@ -123,20 +111,16 @@ namespace {
Bitboard sliding_attack(Direction directions[], Square sq, Bitboard occupied) {
Bitboard attack = 0;
Bitboard attacks = 0;
for (int i = 0; i < 4; ++i)
for (Square s = sq + directions[i];
is_ok(s) && distance(s, s - directions[i]) == 1;
s += directions[i])
{
attack |= s;
if (occupied & s)
break;
Square s = sq;
while(safe_destination(s, directions[i]) && !(occupied & s))
attacks |= (s += directions[i]);
}
return attack;
return attacks;
}

87
DroidFishApp/src/main/cpp/stockfish/bitboard.h
View File

@ -106,7 +106,7 @@ extern Magic RookMagics[SQUARE_NB];
extern Magic BishopMagics[SQUARE_NB];
inline Bitboard square_bb(Square s) {
assert(s >= SQ_A1 && s <= SQ_H8);
assert(is_ok(s));
return SquareBB[s];
}
@ -123,14 +123,14 @@ inline Bitboard operator&(Square s, Bitboard b) { return b & s; }
inline Bitboard operator|(Square s, Bitboard b) { return b | s; }
inline Bitboard operator^(Square s, Bitboard b) { return b ^ s; }
inline Bitboard operator|(Square s, Square s2) { return square_bb(s) | square_bb(s2); }
inline Bitboard operator|(Square s, Square s2) { return square_bb(s) | s2; }
constexpr bool more_than_one(Bitboard b) {
return b & (b - 1);
}
inline bool opposite_colors(Square s1, Square s2) {
return bool(DarkSquares & s1) != bool(DarkSquares & s2);
constexpr bool opposite_colors(Square s1, Square s2) {
return (s1 + rank_of(s1) + s2 + rank_of(s2)) & 1;
}
@ -154,7 +154,7 @@ inline Bitboard file_bb(Square s) {
}
/// shift() moves a bitboard one step along direction D
/// shift() moves a bitboard one or two steps as specified by the direction D
template<Direction D>
constexpr Bitboard shift(Bitboard b) {
@ -176,6 +176,12 @@ constexpr Bitboard pawn_attacks_bb(Bitboard b) {
: shift<SOUTH_WEST>(b) | shift<SOUTH_EAST>(b);
}
inline Bitboard pawn_attacks_bb(Color c, Square s) {
assert(is_ok(s));
return PawnAttacks[c][s];
}
/// pawn_double_attacks_bb() returns the squares doubly attacked by pawns of the
/// given color from the squares in the given bitboard.
@ -194,13 +200,25 @@ inline Bitboard adjacent_files_bb(Square s) {
return shift<EAST>(file_bb(s)) | shift<WEST>(file_bb(s));
}
/// between_bb() returns squares that are linearly between the given squares
/// line_bb(Square, Square) returns a Bitboard representing an entire line
/// (from board edge to board edge) that intersects the given squares.
/// If the given squares are not on a same file/rank/diagonal, return 0.
/// Ex. line_bb(SQ_C4, SQ_F7) returns a bitboard with the A2-G8 diagonal.
inline Bitboard line_bb(Square s1, Square s2) {
assert(is_ok(s1) && is_ok(s2));
return LineBB[s1][s2];
}
/// between_bb() returns a Bitboard representing squares that are linearly
/// between the given squares (excluding the given squares).
/// If the given squares are not on a same file/rank/diagonal, return 0.
/// Ex. between_bb(SQ_C4, SQ_F7) returns a bitboard with squares D5 and E6.
inline Bitboard between_bb(Square s1, Square s2) {
return LineBB[s1][s2] & ( (AllSquares << (s1 + (s1 < s2)))
^(AllSquares << (s2 + !(s1 < s2))));
Bitboard b = line_bb(s1, s2) & ((AllSquares << s1) ^ (AllSquares << s2));
return b & (b - 1); //exclude lsb
}
@ -209,8 +227,8 @@ inline Bitboard between_bb(Square s1, Square s2) {
/// forward_ranks_bb(BLACK, SQ_D3) will return the 16 squares on ranks 1 and 2.
inline Bitboard forward_ranks_bb(Color c, Square s) {
return c == WHITE ? ~Rank1BB << 8 * (rank_of(s) - RANK_1)
: ~Rank8BB >> 8 * (RANK_8 - rank_of(s));
return c == WHITE ? ~Rank1BB << 8 * relative_rank(WHITE, s)
: ~Rank8BB >> 8 * relative_rank(BLACK, s);
}
@ -243,7 +261,7 @@ inline Bitboard passed_pawn_span(Color c, Square s) {
/// straight or on a diagonal line.
inline bool aligned(Square s1, Square s2, Square s3) {
return LineBB[s1][s2] & s3;
return line_bb(s1, s2) & s3;
}
@ -255,23 +273,49 @@ template<> inline int distance<File>(Square x, Square y) { return std::abs(file_
template<> inline int distance<Rank>(Square x, Square y) { return std::abs(rank_of(x) - rank_of(y)); }
template<> inline int distance<Square>(Square x, Square y) { return SquareDistance[x][y]; }
template<class T> constexpr const T& clamp(const T& v, const T& lo, const T& hi) {
return v < lo ? lo : v > hi ? hi : v;
inline int edge_distance(File f) { return std::min(f, File(FILE_H - f)); }
inline int edge_distance(Rank r) { return std::min(r, Rank(RANK_8 - r)); }
/// Return the target square bitboard if we do not step off the board, empty otherwise
inline Bitboard safe_destination(Square s, int step)
{
Square to = Square(s + step);
return is_ok(to) && distance(s, to) <= 2 ? square_bb(to) : Bitboard(0);
}
/// attacks_bb() returns a bitboard representing all the squares attacked by a
/// piece of type Pt (bishop or rook) placed on 's'.
/// attacks_bb(Square) returns the pseudo attacks of the give piece type
/// assuming an empty board.
template<PieceType Pt>
inline Bitboard attacks_bb(Square s) {
assert((Pt != PAWN) && (is_ok(s)));
return PseudoAttacks[Pt][s];
}
/// attacks_bb(Square, Bitboard) returns the attacks by the given piece
/// assuming the board is occupied according to the passed Bitboard.
/// Sliding piece attacks do not continue passed an occupied square.
template<PieceType Pt>
inline Bitboard attacks_bb(Square s, Bitboard occupied) {
const Magic& m = Pt == ROOK ? RookMagics[s] : BishopMagics[s];
return m.attacks[m.index(occupied)];
assert((Pt != PAWN) && (is_ok(s)));
switch (Pt)
{
case BISHOP: return BishopMagics[s].attacks[BishopMagics[s].index(occupied)];
case ROOK : return RookMagics[s].attacks[ RookMagics[s].index(occupied)];
case QUEEN : return attacks_bb<BISHOP>(s, occupied) | attacks_bb<ROOK>(s, occupied);
default : return PseudoAttacks[Pt][s];
}
}
inline Bitboard attacks_bb(PieceType pt, Square s, Bitboard occupied) {
assert(pt != PAWN);
assert((pt != PAWN) && (is_ok(s)));
switch (pt)
{
@ -376,14 +420,17 @@ inline Square msb(Bitboard b) {
/// pop_lsb() finds and clears the least significant bit in a non-zero bitboard
inline Square pop_lsb(Bitboard* b) {
assert(*b);
const Square s = lsb(*b);
*b &= *b - 1;
return s;
}
/// frontmost_sq() returns the most advanced square for the given color
/// frontmost_sq() returns the most advanced square for the given color,
/// requires a non-zero bitboard.
inline Square frontmost_sq(Color c, Bitboard b) {
assert(b);
return c == WHITE ? msb(b) : lsb(b);
}

171
DroidFishApp/src/main/cpp/stockfish/endgame.cpp
View File

@ -24,42 +24,23 @@
#include "endgame.h"
#include "movegen.h"
using std::string;
namespace {
// Table used to drive the king towards the edge of the board
// Used to drive the king towards the edge of the board
// in KX vs K and KQ vs KR endgames.
constexpr int PushToEdges[SQUARE_NB] = {
100, 90, 80, 70, 70, 80, 90, 100,
90, 70, 60, 50, 50, 60, 70, 90,
80, 60, 40, 30, 30, 40, 60, 80,
70, 50, 30, 20, 20, 30, 50, 70,
70, 50, 30, 20, 20, 30, 50, 70,
80, 60, 40, 30, 30, 40, 60, 80,
90, 70, 60, 50, 50, 60, 70, 90,
100, 90, 80, 70, 70, 80, 90, 100
};
inline int push_to_edge(Square s) {
int rd = edge_distance(rank_of(s)), fd = edge_distance(file_of(s));
return 90 - (7 * fd * fd / 2 + 7 * rd * rd / 2);
}
// Table used to drive the king towards a corner square of the
// right color in KBN vs K endgames.
constexpr int PushToCorners[SQUARE_NB] = {
6400, 6080, 5760, 5440, 5120, 4800, 4480, 4160,
6080, 5760, 5440, 5120, 4800, 4480, 4160, 4480,
5760, 5440, 4960, 4480, 4480, 4000, 4480, 4800,
5440, 5120, 4480, 3840, 3520, 4480, 4800, 5120,
5120, 4800, 4480, 3520, 3840, 4480, 5120, 5440,
4800, 4480, 4000, 4480, 4480, 4960, 5440, 5760,
4480, 4160, 4480, 4800, 5120, 5440, 5760, 6080,
4160, 4480, 4800, 5120, 5440, 5760, 6080, 6400
};
// Used to drive the king towards A1H8 corners in KBN vs K endgames.
inline int push_to_corner(Square s) {
return abs(7 - rank_of(s) - file_of(s));
}
// Tables used to drive a piece towards or away from another piece
constexpr int PushClose[8] = { 0, 0, 100, 80, 60, 40, 20, 10 };
constexpr int PushAway [8] = { 0, 5, 20, 40, 60, 80, 90, 100 };
// Pawn Rank based scaling factors used in KRPPKRP endgame
constexpr int KRPPKRPScaleFactors[RANK_NB] = { 0, 9, 10, 14, 21, 44, 0, 0 };
// Drive a piece close to or away from another piece
inline int push_close(Square s1, Square s2) { return 140 - 20 * distance(s1, s2); }
inline int push_away(Square s1, Square s2) { return 120 - push_close(s1, s2); }
#ifndef NDEBUG
bool verify_material(const Position& pos, Color c, Value npm, int pawnsCnt) {
@ -74,9 +55,9 @@ namespace {
assert(pos.count<PAWN>(strongSide) == 1);
if (file_of(pos.square<PAWN>(strongSide)) >= FILE_E)
sq = Square(int(sq) ^ 7); // Mirror SQ_H1 -> SQ_A1
sq = flip_file(sq);
return strongSide == WHITE ? sq : ~sq;
return strongSide == WHITE ? sq : flip_rank(sq);
}
} // namespace
@ -98,8 +79,6 @@ namespace Endgames {
add<KQKR>("KQKR");
add<KNNKP>("KNNKP");
add<KNPK>("KNPK");
add<KNPKB>("KNPKB");
add<KRPKR>("KRPKR");
add<KRPKB>("KRPKB");
add<KBPKB>("KBPKB");
@ -129,15 +108,15 @@ Value Endgame<KXK>::operator()(const Position& pos) const {
Value result = pos.non_pawn_material(strongSide)
+ pos.count<PAWN>(strongSide) * PawnValueEg
+ PushToEdges[loserKSq]
+ PushClose[distance(winnerKSq, loserKSq)];
+ push_to_edge(loserKSq)
+ push_close(winnerKSq, loserKSq);
if ( pos.count<QUEEN>(strongSide)
|| pos.count<ROOK>(strongSide)
||(pos.count<BISHOP>(strongSide) && pos.count<KNIGHT>(strongSide))
|| ( (pos.pieces(strongSide, BISHOP) & ~DarkSquares)
&& (pos.pieces(strongSide, BISHOP) & DarkSquares)))
result = std::min(result + VALUE_KNOWN_WIN, VALUE_MATE_IN_MAX_PLY - 1);
result = std::min(result + VALUE_KNOWN_WIN, VALUE_TB_WIN_IN_MAX_PLY - 1);
return strongSide == pos.side_to_move() ? result : -result;
}
@ -158,11 +137,11 @@ Value Endgame<KBNK>::operator()(const Position& pos) const {
// If our bishop does not attack A1/H8, we flip the enemy king square
// to drive to opposite corners (A8/H1).
Value result = VALUE_KNOWN_WIN
+ PushClose[distance(winnerKSq, loserKSq)]
+ PushToCorners[opposite_colors(bishopSq, SQ_A1) ? ~loserKSq : loserKSq];
Value result = (VALUE_KNOWN_WIN + 3520)
+ push_close(winnerKSq, loserKSq)
+ 420 * push_to_corner(opposite_colors(bishopSq, SQ_A1) ? flip_file(loserKSq) : loserKSq);
assert(abs(result) < VALUE_MATE_IN_MAX_PLY);
assert(abs(result) < VALUE_TB_WIN_IN_MAX_PLY);
return strongSide == pos.side_to_move() ? result : -result;
}
@ -243,7 +222,7 @@ Value Endgame<KRKB>::operator()(const Position& pos) const {
assert(verify_material(pos, strongSide, RookValueMg, 0));
assert(verify_material(pos, weakSide, BishopValueMg, 0));
Value result = Value(PushToEdges[pos.square<KING>(weakSide)]);
Value result = Value(push_to_edge(pos.square<KING>(weakSide)));
return strongSide == pos.side_to_move() ? result : -result;
}
@ -258,7 +237,7 @@ Value Endgame<KRKN>::operator()(const Position& pos) const {
Square bksq = pos.square<KING>(weakSide);
Square bnsq = pos.square<KNIGHT>(weakSide);
Value result = Value(PushToEdges[bksq] + PushAway[distance(bksq, bnsq)]);
Value result = Value(push_to_edge(bksq) + push_away(bksq, bnsq));
return strongSide == pos.side_to_move() ? result : -result;
}
@ -277,11 +256,11 @@ Value Endgame<KQKP>::operator()(const Position& pos) const {
Square loserKSq = pos.square<KING>(weakSide);
Square pawnSq = pos.square<PAWN>(weakSide);
Value result = Value(PushClose[distance(winnerKSq, loserKSq)]);
Value result = Value(push_close(winnerKSq, loserKSq));
if ( relative_rank(weakSide, pawnSq) != RANK_7
|| distance(loserKSq, pawnSq) != 1
|| !((FileABB | FileCBB | FileFBB | FileHBB) & pawnSq))
|| ((FileBBB | FileDBB | FileEBB | FileGBB) & pawnSq))
result += QueenValueEg - PawnValueEg;
return strongSide == pos.side_to_move() ? result : -result;
@ -303,23 +282,24 @@ Value Endgame<KQKR>::operator()(const Position& pos) const {
Value result = QueenValueEg
- RookValueEg
+ PushToEdges[loserKSq]
+ PushClose[distance(winnerKSq, loserKSq)];
+ push_to_edge(loserKSq)
+ push_close(winnerKSq, loserKSq);
return strongSide == pos.side_to_move() ? result : -result;
}
/// KNN vs KP. Simply push the opposing king to the corner
/// KNN vs KP. Very drawish, but there are some mate opportunities if we can
// press the weakSide King to a corner before the pawn advances too much.
template<>
Value Endgame<KNNKP>::operator()(const Position& pos) const {
assert(verify_material(pos, strongSide, 2 * KnightValueMg, 0));
assert(verify_material(pos, weakSide, VALUE_ZERO, 1));
Value result = 2 * KnightValueEg
- PawnValueEg
+ PushToEdges[pos.square<KING>(weakSide)];
Value result = PawnValueEg
+ 2 * push_to_edge(pos.square<KING>(weakSide))
- 10 * relative_rank(weakSide, pos.square<PAWN>(weakSide));
return strongSide == pos.side_to_move() ? result : -result;
}
@ -342,29 +322,27 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
// No assertions about the material of weakSide, because we want draws to
// be detected even when the weaker side has some pawns.
Bitboard pawns = pos.pieces(strongSide, PAWN);
File pawnsFile = file_of(lsb(pawns));
Bitboard strongPawns = pos.pieces(strongSide, PAWN);
Bitboard allPawns = pos.pieces(PAWN);
// All pawns are on a single rook file?
if ( (pawnsFile == FILE_A || pawnsFile == FILE_H)
&& !(pawns & ~file_bb(pawnsFile)))
// All strongSide pawns are on a single rook file?
if (!(strongPawns & ~FileABB) || !(strongPawns & ~FileHBB))
{
Square bishopSq = pos.square<BISHOP>(strongSide);
Square queeningSq = relative_square(strongSide, make_square(pawnsFile, RANK_8));
Square kingSq = pos.square<KING>(weakSide);
Square queeningSq = relative_square(strongSide, make_square(file_of(lsb(strongPawns)), RANK_8));
Square weakKingSq = pos.square<KING>(weakSide);
if ( opposite_colors(queeningSq, bishopSq)
&& distance(queeningSq, kingSq) <= 1)
&& distance(queeningSq, weakKingSq) <= 1)
return SCALE_FACTOR_DRAW;
}
// If all the pawns are on the same B or G file, then it's potentially a draw
if ( (pawnsFile == FILE_B || pawnsFile == FILE_G)
&& !(pos.pieces(PAWN) & ~file_bb(pawnsFile))
if ((!(allPawns & ~FileBBB) || !(allPawns & ~FileGBB))
&& pos.non_pawn_material(weakSide) == 0
&& pos.count<PAWN>(weakSide) >= 1)
{
// Get weakSide pawn that is closest to the home rank
// Get the least advanced weakSide pawn
Square weakPawnSq = frontmost_sq(strongSide, pos.pieces(weakSide, PAWN));
Square strongKingSq = pos.square<KING>(strongSide);
@ -374,8 +352,8 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
// There's potential for a draw if our pawn is blocked on the 7th rank,
// the bishop cannot attack it or they only have one pawn left
if ( relative_rank(strongSide, weakPawnSq) == RANK_7
&& (pos.pieces(strongSide, PAWN) & (weakPawnSq + pawn_push(weakSide)))
&& (opposite_colors(bishopSq, weakPawnSq) || pos.count<PAWN>(strongSide) == 1))
&& (strongPawns & (weakPawnSq + pawn_push(weakSide)))
&& (opposite_colors(bishopSq, weakPawnSq) || !more_than_one(strongPawns)))
{
int strongKingDist = distance(weakPawnSq, strongKingSq);
int weakKingDist = distance(weakPawnSq, weakKingSq);
@ -413,8 +391,8 @@ ScaleFactor Endgame<KQKRPs>::operator()(const Position& pos) const {
&& relative_rank(weakSide, pos.square<KING>(strongSide)) >= RANK_4
&& relative_rank(weakSide, rsq) == RANK_3
&& ( pos.pieces(weakSide, PAWN)
& pos.attacks_from<KING>(kingSq)
& pos.attacks_from<PAWN>(rsq, strongSide)))
& attacks_bb<KING>(kingSq)
& pawn_attacks_bb(strongSide, rsq)))
return SCALE_FACTOR_DRAW;
return SCALE_FACTOR_NONE;
@ -557,7 +535,7 @@ ScaleFactor Endgame<KRPKB>::operator()(const Position& pos) const {
// the corner
if ( rk == RANK_6
&& distance(psq + 2 * push, ksq) <= 1
&& (PseudoAttacks[BISHOP][bsq] & (psq + push))
&& (attacks_bb<BISHOP>(bsq) & (psq + push))
&& distance<File>(bsq, psq) >= 2)
return ScaleFactor(8);
}
@ -588,7 +566,7 @@ ScaleFactor Endgame<KRPPKRP>::operator()(const Position& pos) const {
&& relative_rank(strongSide, bksq) > r)
{
assert(r > RANK_1 && r < RANK_7);
return ScaleFactor(KRPPKRPScaleFactors[r]);
return ScaleFactor(7 * r);
}
return SCALE_FACTOR_NONE;
}
@ -606,11 +584,9 @@ ScaleFactor Endgame<KPsK>::operator()(const Position& pos) const {
Square ksq = pos.square<KING>(weakSide);
Bitboard pawns = pos.pieces(strongSide, PAWN);
// If all pawns are ahead of the king, on a single rook file and
// the king is within one file of the pawns, it's a draw.
if ( !(pawns & ~forward_ranks_bb(weakSide, ksq))
&& !((pawns & ~FileABB) && (pawns & ~FileHBB))
&& distance<File>(ksq, lsb(pawns)) <= 1)
// If all pawns are ahead of the king on a single rook file, it's a draw.
if (!((pawns & ~FileABB) || (pawns & ~FileHBB)) &&
!(pawns & ~passed_pawn_span(weakSide, ksq)))
return SCALE_FACTOR_DRAW;
return SCALE_FACTOR_NONE;
@ -633,8 +609,7 @@ ScaleFactor Endgame<KBPKB>::operator()(const Position& pos) const {
Square weakKingSq = pos.square<KING>(weakSide);
// Case 1: Defending king blocks the pawn, and cannot be driven away
if ( file_of(weakKingSq) == file_of(pawnSq)
&& relative_rank(strongSide, pawnSq) < relative_rank(strongSide, weakKingSq)
if ( (forward_file_bb(strongSide, pawnSq) & weakKingSq)
&& ( opposite_colors(weakKingSq, strongBishopSq)
|| relative_rank(strongSide, weakKingSq) <= RANK_6))
return SCALE_FACTOR_DRAW;
@ -695,14 +670,14 @@ ScaleFactor Endgame<KBPPKB>::operator()(const Position& pos) const {
if ( ksq == blockSq1
&& opposite_colors(ksq, wbsq)
&& ( bbsq == blockSq2
|| (pos.attacks_from<BISHOP>(blockSq2) & pos.pieces(weakSide, BISHOP))
|| (attacks_bb<BISHOP>(blockSq2, pos.pieces()) & pos.pieces(weakSide, BISHOP))
|| distance<Rank>(psq1, psq2) >= 2))
return SCALE_FACTOR_DRAW;
else if ( ksq == blockSq2
&& opposite_colors(ksq, wbsq)
&& ( bbsq == blockSq1
|| (pos.attacks_from<BISHOP>(blockSq1) & pos.pieces(weakSide, BISHOP))))
|| (attacks_bb<BISHOP>(blockSq1, pos.pieces()) & pos.pieces(weakSide, BISHOP))))
return SCALE_FACTOR_DRAW;
else
return SCALE_FACTOR_NONE;
@ -737,46 +712,6 @@ ScaleFactor Endgame<KBPKN>::operator()(const Position& pos) const {
}
/// KNP vs K. There is a single rule: if the pawn is a rook pawn on the 7th rank
/// and the defending king prevents the pawn from advancing, the position is drawn.
template<>
ScaleFactor Endgame<KNPK>::operator()(const Position& pos) const {
assert(verify_material(pos, strongSide, KnightValueMg, 1));
assert(verify_material(pos, weakSide, VALUE_ZERO, 0));
// Assume strongSide is white and the pawn is on files A-D
Square pawnSq = normalize(pos, strongSide, pos.square<PAWN>(strongSide));
Square weakKingSq = normalize(pos, strongSide, pos.square<KING>(weakSide));
if (pawnSq == SQ_A7 && distance(SQ_A8, weakKingSq) <= 1)
return SCALE_FACTOR_DRAW;
return SCALE_FACTOR_NONE;
}
/// KNP vs KB. If knight can block bishop from taking pawn, it's a win.
/// Otherwise the position is drawn.
template<>
ScaleFactor Endgame<KNPKB>::operator()(const Position& pos) const {
assert(verify_material(pos, strongSide, KnightValueMg, 1));
assert(verify_material(pos, weakSide, BishopValueMg, 0));
Square pawnSq = pos.square<PAWN>(strongSide);
Square bishopSq = pos.square<BISHOP>(weakSide);
Square weakKingSq = pos.square<KING>(weakSide);
// King needs to get close to promoting pawn to prevent knight from blocking.
// Rules for this are very tricky, so just approximate.
if (forward_file_bb(strongSide, pawnSq) & pos.attacks_from<BISHOP>(bishopSq))
return ScaleFactor(distance(weakKingSq, pawnSq));
return SCALE_FACTOR_NONE;
}
/// KP vs KP. This is done by removing the weakest side's pawn and probing the
/// KP vs K bitbase: If the weakest side has a draw without the pawn, it probably
/// has at least a draw with the pawn as well. The exception is when the stronger

4
DroidFishApp/src/main/cpp/stockfish/endgame.h
View File

@ -21,10 +21,10 @@
#ifndef ENDGAME_H_INCLUDED
#define ENDGAME_H_INCLUDED
#include <unordered_map>
#include <memory>
#include <string>
#include <type_traits>
#include <unordered_map>
#include <utility>
#include "position.h"
@ -57,8 +57,6 @@ enum EndgameCode {
KBPKB, // KBP vs KB
KBPPKB, // KBPP vs KB
KBPKN, // KBP vs KN
KNPK, // KNP vs K
KNPKB, // KNP vs KB
KPKP // KP vs KP
};

266
DroidFishApp/src/main/cpp/stockfish/evaluate.cpp
View File

@ -35,7 +35,7 @@ namespace Trace {
enum Tracing { NO_TRACE, TRACE };
enum Term { // The first 8 entries are reserved for PieceType
MATERIAL = 8, IMBALANCE, MOBILITY, THREAT, PASSED, SPACE, INITIATIVE, TOTAL, TERM_NB
MATERIAL = 8, IMBALANCE, MOBILITY, THREAT, PASSED, SPACE, WINNABLE, TOTAL, TERM_NB
};
Score scores[TERM_NB][COLOR_NB];
@ -59,7 +59,7 @@ namespace Trace {
std::ostream& operator<<(std::ostream& os, Term t) {
if (t == MATERIAL || t == IMBALANCE || t == INITIATIVE || t == TOTAL)
if (t == MATERIAL || t == IMBALANCE || t == WINNABLE || t == TOTAL)
os << " ---- ----" << " | " << " ---- ----";
else
os << scores[t][WHITE] << " | " << scores[t][BLACK];
@ -81,44 +81,44 @@ namespace {
constexpr int KingAttackWeights[PIECE_TYPE_NB] = { 0, 0, 81, 52, 44, 10 };
// Penalties for enemy's safe checks
constexpr int QueenSafeCheck = 780;
constexpr int RookSafeCheck = 1080;
constexpr int BishopSafeCheck = 635;
constexpr int KnightSafeCheck = 790;
constexpr int QueenSafeCheck = 772;
constexpr int RookSafeCheck = 1084;
constexpr int BishopSafeCheck = 645;
constexpr int KnightSafeCheck = 792;
#define S(mg, eg) make_score(mg, eg)
// MobilityBonus[PieceType-2][attacked] contains bonuses for middle and end game,
// indexed by piece type and number of attacked squares in the mobility area.
constexpr Score MobilityBonus[][32] = {
{ S(-62,-81), S(-53,-56), S(-12,-30), S( -4,-14), S( 3, 8), S( 13, 15), // Knights
S( 22, 23), S( 28, 27), S( 33, 33) },
{ S(-48,-59), S(-20,-23), S( 16, -3), S( 26, 13), S( 38, 24), S( 51, 42), // Bishops
{ S(-62,-81), S(-53,-56), S(-12,-31), S( -4,-16), S( 3, 5), S( 13, 11), // Knight
S( 22, 17), S( 28, 20), S( 33, 25) },
{ S(-48,-59), S(-20,-23), S( 16, -3), S( 26, 13), S( 38, 24), S( 51, 42), // Bishop
S( 55, 54), S( 63, 57), S( 63, 65), S( 68, 73), S( 81, 78), S( 81, 86),
S( 91, 88), S( 98, 97) },
{ S(-58,-76), S(-27,-18), S(-15, 28), S(-10, 55), S( -5, 69), S( -2, 82), // Rooks
S( 9,112), S( 16,118), S( 30,132), S( 29,142), S( 32,155), S( 38,165),
S( 46,166), S( 48,169), S( 58,171) },
{ S(-39,-36), S(-21,-15), S( 3, 8), S( 3, 18), S( 14, 34), S( 22, 54), // Queens
S( 28, 61), S( 41, 73), S( 43, 79), S( 48, 92), S( 56, 94), S( 60,104),
S( 60,113), S( 66,120), S( 67,123), S( 70,126), S( 71,133), S( 73,136),
S( 79,140), S( 88,143), S( 88,148), S( 99,166), S(102,170), S(102,175),
S(106,184), S(109,191), S(113,206), S(116,212) }
{ S(-60,-78), S(-20,-17), S( 2, 23), S( 3, 39), S( 3, 70), S( 11, 99), // Rook
S( 22,103), S( 31,121), S( 40,134), S( 40,139), S( 41,158), S( 48,164),
S( 57,168), S( 57,169), S( 62,172) },
{ S(-30,-48), S(-12,-30), S( -8, -7), S( -9, 19), S( 20, 40), S( 23, 55), // Queen
S( 23, 59), S( 35, 75), S( 38, 78), S( 53, 96), S( 64, 96), S( 65,100),
S( 65,121), S( 66,127), S( 67,131), S( 67,133), S( 72,136), S( 72,141),
S( 77,147), S( 79,150), S( 93,151), S(108,168), S(108,168), S(108,171),
S(110,182), S(114,182), S(114,192), S(116,219) }
};
// RookOnFile[semiopen/open] contains bonuses for each rook when there is
// no (friendly) pawn on the rook file.
constexpr Score RookOnFile[] = { S(21, 4), S(47, 25) };
constexpr Score RookOnFile[] = { S(19, 7), S(48, 29) };
// ThreatByMinor/ByRook[attacked PieceType] contains bonuses according to
// which piece type attacks which one. Attacks on lesser pieces which are
// pawn-defended are not considered.
constexpr Score ThreatByMinor[PIECE_TYPE_NB] = {
S(0, 0), S(6, 32), S(59, 41), S(79, 56), S(90, 119), S(79, 161)
S(0, 0), S(5, 32), S(57, 41), S(77, 56), S(88, 119), S(79, 161)
};
constexpr Score ThreatByRook[PIECE_TYPE_NB] = {
S(0, 0), S(3, 44), S(38, 71), S(38, 61), S(0, 38), S(51, 38)
S(0, 0), S(3, 46), S(37, 68), S(42, 60), S(0, 38), S(58, 41)
};
// PassedRank[Rank] contains a bonus according to the rank of a passed pawn
@ -128,25 +128,31 @@ namespace {
// Assorted bonuses and penalties
constexpr Score BishopPawns = S( 3, 7);
constexpr Score BishopOnKingRing = S( 24, 0);
constexpr Score BishopXRayPawns = S( 4, 5);
constexpr Score CorneredBishop = S( 50, 50);
constexpr Score FlankAttacks = S( 8, 0);
constexpr Score Hanging = S( 69, 36);
constexpr Score KingProtector = S( 7, 8);
constexpr Score KnightOnQueen = S( 16, 12);
constexpr Score BishopKingProtector = S( 6, 9);
constexpr Score KnightKingProtector = S( 8, 9);
constexpr Score KnightOnQueen = S( 16, 11);
constexpr Score LongDiagonalBishop = S( 45, 0);
constexpr Score MinorBehindPawn = S( 18, 3);
constexpr Score Outpost = S( 30, 21);
constexpr Score KnightOutpost = S( 56, 36);
constexpr Score BishopOutpost = S( 30, 23);
constexpr Score ReachableOutpost = S( 31, 22);
constexpr Score PassedFile = S( 11, 8);
constexpr Score PawnlessFlank = S( 17, 95);
constexpr Score RestrictedPiece = S( 7, 7);
constexpr Score ReachableOutpost = S( 32, 10);
constexpr Score RookOnQueenFile = S( 7, 6);
constexpr Score RookOnKingRing = S( 16, 0);
constexpr Score RookOnQueenFile = S( 5, 9);
constexpr Score SliderOnQueen = S( 59, 18);
constexpr Score ThreatByKing = S( 24, 89);
constexpr Score ThreatByPawnPush = S( 48, 39);
constexpr Score ThreatBySafePawn = S(173, 94);
constexpr Score TrappedRook = S( 52, 10);
constexpr Score WeakQueen = S( 49, 15);
constexpr Score TrappedRook = S( 55, 13);
constexpr Score WeakQueen = S( 51, 14);
constexpr Score WeakQueenProtection = S( 15, 0);
#undef S
@ -167,8 +173,7 @@ namespace {
template<Color Us> Score threats() const;
template<Color Us> Score passed() const;
template<Color Us> Score space() const;
ScaleFactor scale_factor(Value eg) const;
Score initiative(Score score) const;
Value winnable(Score score) const;
const Position& pos;
Material::Entry* me;
@ -213,7 +218,7 @@ namespace {
template<Tracing T> template<Color Us>
void Evaluation<T>::initialize() {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Direction Up = pawn_push(Us);
constexpr Direction Down = -Up;
constexpr Bitboard LowRanks = (Us == WHITE ? Rank2BB | Rank3BB : Rank7BB | Rank6BB);
@ -230,15 +235,15 @@ namespace {
mobilityArea[Us] = ~(b | pos.pieces(Us, KING, QUEEN) | pos.blockers_for_king(Us) | pe->pawn_attacks(Them));
// Initialize attackedBy[] for king and pawns
attackedBy[Us][KING] = pos.attacks_from<KING>(ksq);
attackedBy[Us][KING] = attacks_bb<KING>(ksq);
attackedBy[Us][PAWN] = pe->pawn_attacks(Us);
attackedBy[Us][ALL_PIECES] = attackedBy[Us][KING] | attackedBy[Us][PAWN];
attackedBy2[Us] = dblAttackByPawn | (attackedBy[Us][KING] & attackedBy[Us][PAWN]);
// Init our king safety tables
Square s = make_square(clamp(file_of(ksq), FILE_B, FILE_G),
clamp(rank_of(ksq), RANK_2, RANK_7));
kingRing[Us] = PseudoAttacks[KING][s] | s;
Square s = make_square(Utility::clamp(file_of(ksq), FILE_B, FILE_G),
Utility::clamp(rank_of(ksq), RANK_2, RANK_7));
kingRing[Us] = attacks_bb<KING>(s) | s;
kingAttackersCount[Them] = popcount(kingRing[Us] & pe->pawn_attacks(Them));
kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
@ -252,7 +257,7 @@ namespace {
template<Tracing T> template<Color Us, PieceType Pt>
Score Evaluation<T>::pieces() {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Direction Down = -pawn_push(Us);
constexpr Bitboard OutpostRanks = (Us == WHITE ? Rank4BB | Rank5BB | Rank6BB
: Rank5BB | Rank4BB | Rank3BB);
@ -268,10 +273,10 @@ namespace {
// Find attacked squares, including x-ray attacks for bishops and rooks
b = Pt == BISHOP ? attacks_bb<BISHOP>(s, pos.pieces() ^ pos.pieces(QUEEN))
: Pt == ROOK ? attacks_bb< ROOK>(s, pos.pieces() ^ pos.pieces(QUEEN) ^ pos.pieces(Us, ROOK))
: pos.attacks_from<Pt>(s);
: attacks_bb<Pt>(s, pos.pieces());
if (pos.blockers_for_king(Us) & s)
b &= LineBB[pos.square<KING>(Us)][s];
b &= line_bb(pos.square<KING>(Us), s);
attackedBy2[Us] |= attackedBy[Us][ALL_PIECES] & b;
attackedBy[Us][Pt] |= b;
@ -284,6 +289,12 @@ namespace {
kingAttacksCount[Us] += popcount(b & attackedBy[Them][KING]);
}
else if (Pt == ROOK && (file_bb(s) & kingRing[Them]))
score += RookOnKingRing;
else if (Pt == BISHOP && (attacks_bb<BISHOP>(s, pos.pieces(PAWN)) & kingRing[Them]))
score += BishopOnKingRing;
int mob = popcount(b & mobilityArea[Us]);
mobility[Us] += MobilityBonus[Pt - 2][mob];
@ -293,26 +304,30 @@ namespace {
// Bonus if piece is on an outpost square or can reach one
bb = OutpostRanks & attackedBy[Us][PAWN] & ~pe->pawn_attacks_span(Them);
if (bb & s)
score += Outpost * (Pt == KNIGHT ? 2 : 1);
score += (Pt == KNIGHT) ? KnightOutpost : BishopOutpost;
else if (Pt == KNIGHT && bb & b & ~pos.pieces(Us))
score += ReachableOutpost;
// Knight and Bishop bonus for being right behind a pawn
// Bonus for a knight or bishop shielded by pawn
if (shift<Down>(pos.pieces(PAWN)) & s)
score += MinorBehindPawn;
// Penalty if the piece is far from the king
score -= KingProtector * distance(s, pos.square<KING>(Us));
score -= (Pt == KNIGHT ? KnightKingProtector
: BishopKingProtector) * distance(pos.square<KING>(Us), s);
if (Pt == BISHOP)
{
// Penalty according to number of pawns on the same color square as the
// bishop, bigger when the center files are blocked with pawns.
// Penalty according to the number of our pawns on the same color square as the
// bishop, bigger when the center files are blocked with pawns and smaller
// when the bishop is outside the pawn chain.
Bitboard blocked = pos.pieces(Us, PAWN) & shift<Down>(pos.pieces());
score -= BishopPawns * pos.pawns_on_same_color_squares(Us, s)
* (1 + popcount(blocked & CenterFiles));
* (!(attackedBy[Us][PAWN] & s) + popcount(blocked & CenterFiles));
// Penalty for all enemy pawns x-rayed
score -= BishopXRayPawns * popcount(attacks_bb<BISHOP>(s) & pos.pieces(Them, PAWN));
// Bonus for bishop on a long diagonal which can "see" both center squares
if (more_than_one(attacks_bb<BISHOP>(s, pos.pieces(PAWN)) & Center))
@ -371,7 +386,7 @@ namespace {
template<Tracing T> template<Color Us>
Score Evaluation<T>::king() const {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Bitboard Camp = (Us == WHITE ? AllSquares ^ Rank6BB ^ Rank7BB ^ Rank8BB
: AllSquares ^ Rank1BB ^ Rank2BB ^ Rank3BB);
@ -397,9 +412,9 @@ namespace {
// Enemy rooks checks
rookChecks = b1 & safe & attackedBy[Them][ROOK];
if (rookChecks)
kingDanger += RookSafeCheck;
kingDanger += more_than_one(rookChecks) ? RookSafeCheck * 175/100
: RookSafeCheck;
else
unsafeChecks |= b1 & attackedBy[Them][ROOK];
@ -410,9 +425,9 @@ namespace {
& safe
& ~attackedBy[Us][QUEEN]
& ~rookChecks;
if (queenChecks)
kingDanger += QueenSafeCheck;
kingDanger += more_than_one(queenChecks) ? QueenSafeCheck * 145/100
: QueenSafeCheck;
// Enemy bishops checks: we count them only if they are from squares from
// which we can't give a queen check, because queen checks are more valuable.
@ -420,17 +435,17 @@ namespace {
& attackedBy[Them][BISHOP]
& safe
& ~queenChecks;
if (bishopChecks)
kingDanger += BishopSafeCheck;
kingDanger += more_than_one(bishopChecks) ? BishopSafeCheck * 3/2
: BishopSafeCheck;
else
unsafeChecks |= b2 & attackedBy[Them][BISHOP];
// Enemy knights checks
knightChecks = pos.attacks_from<KNIGHT>(ksq) & attackedBy[Them][KNIGHT];
knightChecks = attacks_bb<KNIGHT>(ksq) & attackedBy[Them][KNIGHT];
if (knightChecks & safe)
kingDanger += KnightSafeCheck;
kingDanger += more_than_one(knightChecks & safe) ? KnightSafeCheck * 162/100
: KnightSafeCheck;
else
unsafeChecks |= knightChecks;
@ -479,7 +494,7 @@ namespace {
template<Tracing T> template<Color Us>
Score Evaluation<T>::threats() const {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Direction Up = pawn_push(Us);
constexpr Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
@ -517,13 +532,15 @@ namespace {
b = ~attackedBy[Them][ALL_PIECES]
| (nonPawnEnemies & attackedBy2[Us]);
score += Hanging * popcount(weak & b);
// Additional bonus if weak piece is only protected by a queen
score += WeakQueenProtection * popcount(weak & attackedBy[Them][QUEEN]);
}
// Bonus for restricting their piece moves
b = attackedBy[Them][ALL_PIECES]
& ~stronglyProtected
& attackedBy[Us][ALL_PIECES];
score += RestrictedPiece * popcount(b);
// Protected or unattacked squares
@ -551,12 +568,12 @@ namespace {
Square s = pos.square<QUEEN>(Them);
safe = mobilityArea[Us] & ~stronglyProtected;
b = attackedBy[Us][KNIGHT] & pos.attacks_from<KNIGHT>(s);
b = attackedBy[Us][KNIGHT] & attacks_bb<KNIGHT>(s);
score += KnightOnQueen * popcount(b & safe);
b = (attackedBy[Us][BISHOP] & pos.attacks_from<BISHOP>(s))
| (attackedBy[Us][ROOK ] & pos.attacks_from<ROOK >(s));
b = (attackedBy[Us][BISHOP] & attacks_bb<BISHOP>(s, pos.pieces()))
| (attackedBy[Us][ROOK ] & attacks_bb<ROOK >(s, pos.pieces()));
score += SliderOnQueen * popcount(b & safe & attackedBy2[Us]);
}
@ -573,18 +590,32 @@ namespace {
template<Tracing T> template<Color Us>
Score Evaluation<T>::passed() const {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Direction Up = pawn_push(Us);
constexpr Direction Down = -Up;
auto king_proximity = [&](Color c, Square s) {
return std::min(distance(pos.square<KING>(c), s), 5);
};
Bitboard b, bb, squaresToQueen, unsafeSquares;
Bitboard b, bb, squaresToQueen, unsafeSquares, blockedPassers, helpers;
Score score = SCORE_ZERO;
b = pe->passed_pawns(Us);
blockedPassers = b & shift<Down>(pos.pieces(Them, PAWN));
if (blockedPassers)
{
helpers = shift<Up>(pos.pieces(Us, PAWN))
& ~pos.pieces(Them)
& (~attackedBy2[Them] | attackedBy[Us][ALL_PIECES]);
// Remove blocked candidate passers that don't have help to pass
b &= ~blockedPassers
| shift<WEST>(helpers)
| shift<EAST>(helpers);
}
while (b)
{
Square s = pop_lsb(&b);
@ -635,13 +666,7 @@ namespace {
}
} // r > RANK_3
// Scale down bonus for candidate passers which need more than one
// pawn push to become passed, or have a pawn in front of them.
if ( !pos.pawn_passed(Us, s + Up)
|| (pos.pieces(PAWN) & (s + Up)))
bonus = bonus / 2;
score += bonus - PassedFile * map_to_queenside(file_of(s));
score += bonus - PassedFile * edge_distance(file_of(s));
}
if (T)
@ -664,7 +689,7 @@ namespace {
if (pos.non_pawn_material() < SpaceThreshold)
return SCORE_ZERO;
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Direction Down = -pawn_push(Us);
constexpr Bitboard SpaceMask =
Us == WHITE ? CenterFiles & (Rank2BB | Rank3BB | Rank4BB)
@ -681,7 +706,7 @@ namespace {
behind |= shift<Down+Down>(behind);
int bonus = popcount(safe) + popcount(behind & safe & ~attackedBy[Them][ALL_PIECES]);
int weight = pos.count<ALL_PIECES>(Us) - 1;
int weight = pos.count<ALL_PIECES>(Us) - 3 + std::min(pe->blocked_count(), 9);
Score score = make_score(bonus * weight * weight / 16, 0);
if (T)
@ -691,56 +716,48 @@ namespace {
}
// Evaluation::initiative() computes the initiative correction value
// for the position. It is a second order bonus/malus based on the
// Evaluation::winnable() adjusts the mg and eg score components based on the
// known attacking/defending status of the players.
// A single value is derived from the mg and eg values and returned.
template<Tracing T>
Score Evaluation<T>::initiative(Score score) const {
Value mg = mg_value(score);
Value eg = eg_value(score);
Value Evaluation<T>::winnable(Score score) const {
int outflanking = distance<File>(pos.square<KING>(WHITE), pos.square<KING>(BLACK))
- distance<Rank>(pos.square<KING>(WHITE), pos.square<KING>(BLACK));
bool infiltration = rank_of(pos.square<KING>(WHITE)) > RANK_4
|| rank_of(pos.square<KING>(BLACK)) < RANK_5;
bool pawnsOnBothFlanks = (pos.pieces(PAWN) & QueenSide)
&& (pos.pieces(PAWN) & KingSide);
bool almostUnwinnable = !pe->passed_count()
&& outflanking < 0
bool almostUnwinnable = outflanking < 0
&& !pawnsOnBothFlanks;
bool infiltration = rank_of(pos.square<KING>(WHITE)) > RANK_4
|| rank_of(pos.square<KING>(BLACK)) < RANK_5;
// Compute the initiative bonus for the attacking side
int complexity = 9 * pe->passed_count()
+ 11 * pos.count<PAWN>()
+ 12 * pos.count<PAWN>()
+ 9 * outflanking
+ 12 * infiltration
+ 21 * pawnsOnBothFlanks
+ 24 * infiltration
+ 51 * !pos.non_pawn_material()
- 43 * almostUnwinnable
- 100 ;
-110 ;
Value mg = mg_value(score);
Value eg = eg_value(score);
// Now apply the bonus: note that we find the attacking side by extracting the
// sign of the midgame or endgame values, and that we carefully cap the bonus
// so that the midgame and endgame scores do not change sign after the bonus.
int u = ((mg > 0) - (mg < 0)) * std::max(std::min(complexity + 50, 0), -abs(mg));
int u = ((mg > 0) - (mg < 0)) * Utility::clamp(complexity + 50, -abs(mg), 0);
int v = ((eg > 0) - (eg < 0)) * std::max(complexity, -abs(eg));
if (T)
Trace::add(INITIATIVE, make_score(u, v));
mg += u;
eg += v;
return make_score(u, v);
}
// Evaluation::scale_factor() computes the scale factor for the winning side
template<Tracing T>
ScaleFactor Evaluation<T>::scale_factor(Value eg) const {
// Compute the scale factor for the winning side
Color strongSide = eg > VALUE_DRAW ? WHITE : BLACK;
int sf = me->scale_factor(pos, strongSide);
@ -748,16 +765,30 @@ namespace {
// If scale is not already specific, scale down the endgame via general heuristics
if (sf == SCALE_FACTOR_NORMAL)
{
if ( pos.opposite_bishops()
&& pos.non_pawn_material() == 2 * BishopValueMg)
sf = 22 ;
if (pos.opposite_bishops())
{
if ( pos.non_pawn_material(WHITE) == BishopValueMg
&& pos.non_pawn_material(BLACK) == BishopValueMg)
sf = 18 + 4 * popcount(pe->passed_pawns(strongSide));
else
sf = std::min(sf, 36 + (pos.opposite_bishops() ? 2 : 7) * pos.count<PAWN>(strongSide));
sf = std::max(0, sf - (pos.rule50_count() - 12) / 4);
sf = 22 + 3 * pos.count<ALL_PIECES>(strongSide);
}
else
sf = std::min(sf, 36 + 7 * pos.count<PAWN>(strongSide));
}
return ScaleFactor(sf);
// Interpolate between the middlegame and (scaled by 'sf') endgame score
v = mg * int(me->game_phase())
+ eg * int(PHASE_MIDGAME - me->game_phase()) * ScaleFactor(sf) / SCALE_FACTOR_NORMAL;
v /= PHASE_MIDGAME;
if (T)
{
Trace::add(WINNABLE, make_score(u, eg * ScaleFactor(sf) / SCALE_FACTOR_NORMAL - eg_value(score)));
Trace::add(TOTAL, make_score(mg, eg * ScaleFactor(sf) / SCALE_FACTOR_NORMAL));
}
return Value(v);
}
@ -797,7 +828,8 @@ namespace {
initialize<WHITE>();
initialize<BLACK>();
// Pieces should be evaluated first (populate attack tables)
// Pieces evaluated first (also populates attackedBy, attackedBy2).
// Note that the order of evaluation of the terms is left unspecified
score += pieces<WHITE, KNIGHT>() - pieces<BLACK, KNIGHT>()
+ pieces<WHITE, BISHOP>() - pieces<BLACK, BISHOP>()
+ pieces<WHITE, ROOK >() - pieces<BLACK, ROOK >()
@ -805,19 +837,14 @@ namespace {
score += mobility[WHITE] - mobility[BLACK];
// More complex interactions that require fully populated attack bitboards
score += king< WHITE>() - king< BLACK>()
+ threats<WHITE>() - threats<BLACK>()
+ passed< WHITE>() - passed< BLACK>()
+ space< WHITE>() - space< BLACK>();
score += initiative(score);
// Interpolate between a middlegame and a (scaled by 'sf') endgame score
ScaleFactor sf = scale_factor(eg_value(score));
v = mg_value(score) * int(me->game_phase())
+ eg_value(score) * int(PHASE_MIDGAME - me->game_phase()) * sf / SCALE_FACTOR_NORMAL;
v /= PHASE_MIDGAME;
// Derive single value from mg and eg parts of score
v = winnable(score);
// In case of tracing add all remaining individual evaluation terms
if (T)
@ -826,11 +853,18 @@ namespace {
Trace::add(IMBALANCE, me->imbalance());
Trace::add(PAWN, pe->pawn_score(WHITE), pe->pawn_score(BLACK));
Trace::add(MOBILITY, mobility[WHITE], mobility[BLACK]);
Trace::add(TOTAL, score);
}
return (pos.side_to_move() == WHITE ? v : -v) // Side to move point of view
+ Eval::Tempo;
// Evaluation grain
v = (v / 16) * 16;
// Side to move point of view
v = (pos.side_to_move() == WHITE ? v : -v) + Tempo;
// Damp down the evaluation linearly when shuffling
v = v * (100 - pos.rule50_count()) / 100;
return v;
}
} // namespace
@ -878,11 +912,11 @@ std::string Eval::trace(const Position& pos) {
<< " Threats | " << Term(THREAT)
<< " Passed | " << Term(PASSED)
<< " Space | " << Term(SPACE)
<< " Initiative | " << Term(INITIATIVE)
<< " Winnable | " << Term(WINNABLE)
<< " ------------+-------------+-------------+------------\n"
<< " Total | " << Term(TOTAL);
ss << "\nTotal evaluation: " << to_cp(v) << " (white side)\n";
ss << "\nFinal evaluation: " << to_cp(v) << " (white side)\n";
return ss.str();
}

2
DroidFishApp/src/main/cpp/stockfish/evaluate.h
View File

@ -29,8 +29,6 @@ class Position;
namespace Eval {
constexpr Value Tempo = Value(28); // Must be visible to search
std::string trace(const Position& pos);
Value evaluate(const Position& pos);

5
DroidFishApp/src/main/cpp/stockfish/main.cpp
View File

@ -21,12 +21,12 @@
#include <iostream>
#include "bitboard.h"
#include "endgame.h"
#include "position.h"
#include "search.h"
#include "thread.h"
#include "tt.h"
#include "uci.h"
#include "endgame.h"
#include "syzygy/tbprobe.h"
namespace PSQT {
@ -38,12 +38,13 @@ int main(int argc, char* argv[]) {
std::cout << engine_info() << std::endl;
UCI::init(Options);
Tune::init();
PSQT::init();
Bitboards::init();
Position::init();
Bitbases::init();
Endgames::init();
Threads.set(Options["Threads"]);
Threads.set(size_t(Options["Threads"]));
Search::clear(); // After threads are up
UCI::loop(argc, argv);

4
DroidFishApp/src/main/cpp/stockfish/material.cpp
View File

@ -84,7 +84,7 @@ namespace {
template<Color Us>
int imbalance(const int pieceCount[][PIECE_TYPE_NB]) {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
int bonus = 0;
@ -129,7 +129,7 @@ Entry* probe(const Position& pos) {
Value npm_w = pos.non_pawn_material(WHITE);
Value npm_b = pos.non_pawn_material(BLACK);
Value npm = clamp(npm_w + npm_b, EndgameLimit, MidgameLimit);
Value npm = Utility::clamp(npm_w + npm_b, EndgameLimit, MidgameLimit);
// Map total non-pawn material into [PHASE_ENDGAME, PHASE_MIDGAME]
e->gamePhase = Phase(((npm - EndgameLimit) * PHASE_MIDGAME) / (MidgameLimit - EndgameLimit));

149
DroidFishApp/src/main/cpp/stockfish/misc.cpp
View File

@ -47,6 +47,11 @@ typedef bool(*fun3_t)(HANDLE, CONST GROUP_AFFINITY*, PGROUP_AFFINITY);
#include <sstream>
#include <vector>
#if defined(__linux__) && !defined(__ANDROID__)
#include <stdlib.h>
#include <sys/mman.h>
#endif
#include "misc.h"
#include "thread.h"
@ -56,7 +61,7 @@ namespace {
/// Version number. If Version is left empty, then compile date in the format
/// DD-MM-YY and show in engine_info.
const string Version = "11";
const string Version = "";
/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
@ -142,7 +147,9 @@ const string engine_info(bool to_uci) {
ss << setw(2) << day << setw(2) << (1 + months.find(month) / 4) << year.substr(2);
}
ss << (to_uci ? "\nid author ": " by ")
ss << (Is64Bit ? " 64" : "")
<< (HasPext ? " BMI2" : (HasPopCnt ? " POPCNT" : ""))
<< (to_uci ? "\nid author ": " by ")
<< "T. Romstad, M. Costalba, J. Kiiski, G. Linscott";
return ss.str();
@ -153,9 +160,9 @@ const string engine_info(bool to_uci) {
const std::string compiler_info() {
#define STRINGIFY2(x) #x
#define STRINGIFY(x) STRINGIFY2(x)
#define VER_STRING(major, minor, patch) STRINGIFY(major) "." STRINGIFY(minor) "." STRINGIFY(patch)
#define stringify2(x) #x
#define stringify(x) stringify2(x)
#define make_version_string(major, minor, patch) stringify(major) "." stringify(minor) "." stringify(patch)
/// Predefined macros hell:
///
@ -169,20 +176,20 @@ const std::string compiler_info() {
#ifdef __clang__
compiler += "clang++ ";
compiler += VER_STRING(__clang_major__, __clang_minor__, __clang_patchlevel__);
compiler += make_version_string(__clang_major__, __clang_minor__, __clang_patchlevel__);
#elif __INTEL_COMPILER
compiler += "Intel compiler ";
compiler += "(version ";
compiler += STRINGIFY(__INTEL_COMPILER) " update " STRINGIFY(__INTEL_COMPILER_UPDATE);
compiler += stringify(__INTEL_COMPILER) " update " stringify(__INTEL_COMPILER_UPDATE);
compiler += ")";
#elif _MSC_VER
compiler += "MSVC ";
compiler += "(version ";
compiler += STRINGIFY(_MSC_FULL_VER) "." STRINGIFY(_MSC_BUILD);
compiler += stringify(_MSC_FULL_VER) "." stringify(_MSC_BUILD);
compiler += ")";
#elif __GNUC__
compiler += "g++ (GNUC) ";
compiler += VER_STRING(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__);
compiler += make_version_string(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__);
#else
compiler += "Unknown compiler ";
compiler += "(unknown version)";
@ -286,6 +293,130 @@ void prefetch(void* addr) {
#endif
/// aligned_ttmem_alloc will return suitably aligned memory, and if possible use large pages.
/// The returned pointer is the aligned one, while the mem argument is the one that needs to be passed to free.
/// With c++17 some of this functionality can be simplified.
#if defined(__linux__) && !defined(__ANDROID__)
void* aligned_ttmem_alloc(size_t allocSize, void*& mem) {
constexpr size_t alignment = 2 * 1024 * 1024; // assumed 2MB page sizes
size_t size = ((allocSize + alignment - 1) / alignment) * alignment; // multiple of alignment
if (posix_memalign(&mem, alignment, size))
mem = nullptr;
madvise(mem, allocSize, MADV_HUGEPAGE);
return mem;
}
#elif defined(_WIN64)
static void* aligned_ttmem_alloc_large_pages(size_t allocSize) {
HANDLE hProcessToken { };
LUID luid { };
void* mem = nullptr;
const size_t largePageSize = GetLargePageMinimum();
if (!largePageSize)
return nullptr;
// We need SeLockMemoryPrivilege, so try to enable it for the process
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hProcessToken))
return nullptr;
if (LookupPrivilegeValue(NULL, SE_LOCK_MEMORY_NAME, &luid))
{
TOKEN_PRIVILEGES tp { };
TOKEN_PRIVILEGES prevTp { };
DWORD prevTpLen = 0;
tp.PrivilegeCount = 1;
tp.Privileges[0].Luid = luid;
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
// Try to enable SeLockMemoryPrivilege. Note that even if AdjustTokenPrivileges() succeeds,
// we still need to query GetLastError() to ensure that the privileges were actually obtained...
if (AdjustTokenPrivileges(
hProcessToken, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), &prevTp, &prevTpLen) &&
GetLastError() == ERROR_SUCCESS)
{
// round up size to full pages and allocate
allocSize = (allocSize + largePageSize - 1) & ~size_t(largePageSize - 1);
mem = VirtualAlloc(
NULL, allocSize, MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE);
// privilege no longer needed, restore previous state
AdjustTokenPrivileges(hProcessToken, FALSE, &prevTp, 0, NULL, NULL);
}
}
CloseHandle(hProcessToken);
return mem;
}
void* aligned_ttmem_alloc(size_t allocSize, void*& mem) {
static bool firstCall = true;
// try to allocate large pages
mem = aligned_ttmem_alloc_large_pages(allocSize);
// Suppress info strings on the first call. The first call occurs before 'uci'
// is received and in that case this output confuses some GUIs.
if (!firstCall)
{
if (mem)
sync_cout << "info string Hash table allocation: Windows large pages used." << sync_endl;
else
sync_cout << "info string Hash table allocation: Windows large pages not used." << sync_endl;
}
firstCall = false;
// fall back to regular, page aligned, allocation if necessary
if (!mem)
mem = VirtualAlloc(NULL, allocSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
return mem;
}
#else
void* aligned_ttmem_alloc(size_t allocSize, void*& mem) {
constexpr size_t alignment = 64; // assumed cache line size
size_t size = allocSize + alignment - 1; // allocate some extra space
mem = malloc(size);
void* ret = reinterpret_cast<void*>((uintptr_t(mem) + alignment - 1) & ~uintptr_t(alignment - 1));
return ret;
}
#endif
/// aligned_ttmem_free will free the previously allocated ttmem
#if defined(_WIN64)
void aligned_ttmem_free(void* mem) {
if (mem && !VirtualFree(mem, 0, MEM_RELEASE))
{
DWORD err = GetLastError();
std::cerr << "Failed to free transposition table. Error code: 0x" <<
std::hex << err << std::dec << std::endl;
exit(EXIT_FAILURE);
}
}
#else
void aligned_ttmem_free(void *mem) {
free(mem);
}
#endif
namespace WinProcGroup {
#ifndef _WIN32

23
DroidFishApp/src/main/cpp/stockfish/misc.h
View File

@ -33,6 +33,8 @@ const std::string engine_info(bool to_uci = false);
const std::string compiler_info();
void prefetch(void* addr);
void start_logger(const std::string& fname);
void* aligned_ttmem_alloc(size_t size, void*& mem);
void aligned_ttmem_free(void* mem); // nop if mem == nullptr
void dbg_hit_on(bool b);
void dbg_hit_on(bool c, bool b);
@ -63,6 +65,14 @@ std::ostream& operator<<(std::ostream&, SyncCout);
#define sync_cout std::cout << IO_LOCK
#define sync_endl std::endl << IO_UNLOCK
namespace Utility {
/// Clamp a value between lo and hi. Available in c++17.
template<class T> constexpr const T& clamp(const T& v, const T& lo, const T& hi) {
return v < lo ? lo : v > hi ? hi : v;
}
}
/// xorshift64star Pseudo-Random Number Generator
/// This class is based on original code written and dedicated
@ -100,6 +110,19 @@ public:
{ return T(rand64() & rand64() & rand64()); }
};
inline uint64_t mul_hi64(uint64_t a, uint64_t b) {
#if defined(__GNUC__) && defined(IS_64BIT)
__extension__ typedef unsigned __int128 uint128;
return ((uint128)a * (uint128)b) >> 64;
#else
uint64_t aL = (uint32_t)a, aH = a >> 32;
uint64_t bL = (uint32_t)b, bH = b >> 32;
uint64_t c1 = (aL * bL) >> 32;
uint64_t c2 = aH * bL + c1;
uint64_t c3 = aL * bH + (uint32_t)c2;
return aH * bH + (c2 >> 32) + (c3 >> 32);
#endif
}
/// Under Windows it is not possible for a process to run on more than one
/// logical processor group. This usually means to be limited to use max 64

109
DroidFishApp/src/main/cpp/stockfish/movegen.cpp
View File

@ -40,7 +40,7 @@ namespace {
// Knight promotion is the only promotion that can give a direct check
// that's not already included in the queen promotion.
if (Type == QUIET_CHECKS && (PseudoAttacks[KNIGHT][to] & ksq))
if (Type == QUIET_CHECKS && (attacks_bb<KNIGHT>(to) & ksq))
*moveList++ = make<PROMOTION>(to - D, to, KNIGHT);
else
(void)ksq; // Silence a warning under MSVC
@ -52,8 +52,7 @@ namespace {
template<Color Us, GenType Type>
ExtMove* generate_pawn_moves(const Position& pos, ExtMove* moveList, Bitboard target) {
// Compute some compile time parameters relative to the white side
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
constexpr Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
constexpr Direction Up = pawn_push(Us);
@ -85,8 +84,8 @@ namespace {
if (Type == QUIET_CHECKS)
{
b1 &= pos.attacks_from<PAWN>(ksq, Them);
b2 &= pos.attacks_from<PAWN>(ksq, Them);
b1 &= pawn_attacks_bb(Them, ksq);
b2 &= pawn_attacks_bb(Them, ksq);
// Add pawn pushes which give discovered check. This is possible only
// if the pawn is not on the same file as the enemy king, because we
@ -167,7 +166,7 @@ namespace {
if (Type == EVASIONS && !(target & (pos.ep_square() - Up)))
return moveList;
b1 = pawnsNotOn7 & pos.attacks_from<PAWN>(pos.ep_square(), Them);
b1 = pawnsNotOn7 & pawn_attacks_bb(Them, pos.ep_square());
assert(b1);
@ -180,27 +179,26 @@ namespace {
}
template<PieceType Pt, bool Checks>
ExtMove* generate_moves(const Position& pos, ExtMove* moveList, Color us,
Bitboard target) {
template<Color Us, PieceType Pt, bool Checks>
ExtMove* generate_moves(const Position& pos, ExtMove* moveList, Bitboard target) {
static_assert(Pt != KING && Pt != PAWN, "Unsupported piece type in generate_moves()");
const Square* pl = pos.squares<Pt>(us);
const Square* pl = pos.squares<Pt>(Us);
for (Square from = *pl; from != SQ_NONE; from = *++pl)
{
if (Checks)
{
if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN)
&& !(PseudoAttacks[Pt][from] & target & pos.check_squares(Pt)))
&& !(attacks_bb<Pt>(from) & target & pos.check_squares(Pt)))
continue;
if (pos.blockers_for_king(~us) & from)
if (pos.blockers_for_king(~Us) & from)
continue;
}
Bitboard b = pos.attacks_from<Pt>(from) & target;
Bitboard b = attacks_bb<Pt>(from, pos.pieces()) & target;
if (Checks)
b &= pos.check_squares(Pt);
@ -214,33 +212,49 @@ namespace {
template<Color Us, GenType Type>
ExtMove* generate_all(const Position& pos, ExtMove* moveList, Bitboard target) {
constexpr CastlingRights OO = Us & KING_SIDE;
constexpr CastlingRights OOO = Us & QUEEN_SIDE;
ExtMove* generate_all(const Position& pos, ExtMove* moveList) {
constexpr bool Checks = Type == QUIET_CHECKS; // Reduce template instantations
Bitboard target;
switch (Type)
{
case CAPTURES:
target = pos.pieces(~Us);
break;
case QUIETS:
case QUIET_CHECKS:
target = ~pos.pieces();
break;
case EVASIONS:
{
Square checksq = lsb(pos.checkers());
target = between_bb(pos.square<KING>(Us), checksq) | checksq;
break;
}
case NON_EVASIONS:
target = ~pos.pieces(Us);
break;
default:
static_assert(true, "Unsupported type in generate_all()");
}
moveList = generate_pawn_moves<Us, Type>(pos, moveList, target);
moveList = generate_moves<KNIGHT, Checks>(pos, moveList, Us, target);
moveList = generate_moves<BISHOP, Checks>(pos, moveList, Us, target);
moveList = generate_moves< ROOK, Checks>(pos, moveList, Us, target);
moveList = generate_moves< QUEEN, Checks>(pos, moveList, Us, target);
moveList = generate_moves<Us, KNIGHT, Checks>(pos, moveList, target);
moveList = generate_moves<Us, BISHOP, Checks>(pos, moveList, target);
moveList = generate_moves<Us, ROOK, Checks>(pos, moveList, target);
moveList = generate_moves<Us, QUEEN, Checks>(pos, moveList, target);
if (Type != QUIET_CHECKS && Type != EVASIONS)
{
Square ksq = pos.square<KING>(Us);
Bitboard b = pos.attacks_from<KING>(ksq) & target;
Bitboard b = attacks_bb<KING>(ksq) & target;
while (b)
*moveList++ = make_move(ksq, pop_lsb(&b));
if (Type != CAPTURES && pos.can_castle(CastlingRights(OO | OOO)))
{
if (!pos.castling_impeded(OO) && pos.can_castle(OO))
*moveList++ = make<CASTLING>(ksq, pos.castling_rook_square(OO));
if (!pos.castling_impeded(OOO) && pos.can_castle(OOO))
*moveList++ = make<CASTLING>(ksq, pos.castling_rook_square(OOO));
}
if ((Type != CAPTURES) && pos.can_castle(Us & ANY_CASTLING))
for(CastlingRights cr : { Us & KING_SIDE, Us & QUEEN_SIDE } )
if (!pos.castling_impeded(cr) && pos.can_castle(cr))
*moveList++ = make<CASTLING>(ksq, pos.castling_rook_square(cr));
}
return moveList;
@ -263,12 +277,8 @@ ExtMove* generate(const Position& pos, ExtMove* moveList) {
Color us = pos.side_to_move();
Bitboard target = Type == CAPTURES ? pos.pieces(~us)
: Type == QUIETS ? ~pos.pieces()
: Type == NON_EVASIONS ? ~pos.pieces(us) : 0;
return us == WHITE ? generate_all<WHITE, Type>(pos, moveList, target)
: generate_all<BLACK, Type>(pos, moveList, target);
return us == WHITE ? generate_all<WHITE, Type>(pos, moveList)
: generate_all<BLACK, Type>(pos, moveList);
}
// Explicit template instantiations
@ -285,27 +295,24 @@ ExtMove* generate<QUIET_CHECKS>(const Position& pos, ExtMove* moveList) {
assert(!pos.checkers());
Color us = pos.side_to_move();
Bitboard dc = pos.blockers_for_king(~us) & pos.pieces(us);
Bitboard dc = pos.blockers_for_king(~us) & pos.pieces(us) & ~pos.pieces(PAWN);
while (dc)
{
Square from = pop_lsb(&dc);
PieceType pt = type_of(pos.piece_on(from));
if (pt == PAWN)
continue; // Will be generated together with direct checks
Bitboard b = pos.attacks_from(pt, from) & ~pos.pieces();
Bitboard b = attacks_bb(pt, from, pos.pieces()) & ~pos.pieces();
if (pt == KING)
b &= ~PseudoAttacks[QUEEN][pos.square<KING>(~us)];
b &= ~attacks_bb<QUEEN>(pos.square<KING>(~us));
while (b)
*moveList++ = make_move(from, pop_lsb(&b));
}
return us == WHITE ? generate_all<WHITE, QUIET_CHECKS>(pos, moveList, ~pos.pieces())
: generate_all<BLACK, QUIET_CHECKS>(pos, moveList, ~pos.pieces());
return us == WHITE ? generate_all<WHITE, QUIET_CHECKS>(pos, moveList)
: generate_all<BLACK, QUIET_CHECKS>(pos, moveList);
}
@ -325,13 +332,10 @@ ExtMove* generate<EVASIONS>(const Position& pos, ExtMove* moveList) {
// the king evasions in order to skip known illegal moves, which avoids any
// useless legality checks later on.
while (sliders)
{
Square checksq = pop_lsb(&sliders);
sliderAttacks |= LineBB[checksq][ksq] ^ checksq;
}
sliderAttacks |= line_bb(ksq, pop_lsb(&sliders)) & ~pos.checkers();
// Generate evasions for king, capture and non capture moves
Bitboard b = pos.attacks_from<KING>(ksq) & ~pos.pieces(us) & ~sliderAttacks;
Bitboard b = attacks_bb<KING>(ksq) & ~pos.pieces(us) & ~sliderAttacks;
while (b)
*moveList++ = make_move(ksq, pop_lsb(&b));
@ -339,11 +343,8 @@ ExtMove* generate<EVASIONS>(const Position& pos, ExtMove* moveList) {
return moveList; // Double check, only a king move can save the day
// Generate blocking evasions or captures of the checking piece
Square checksq = lsb(pos.checkers());
Bitboard target = between_bb(checksq, ksq) | checksq;
return us == WHITE ? generate_all<WHITE, EVASIONS>(pos, moveList, target)
: generate_all<BLACK, EVASIONS>(pos, moveList, target);
return us == WHITE ? generate_all<WHITE, EVASIONS>(pos, moveList)
: generate_all<BLACK, EVASIONS>(pos, moveList);
}

37
DroidFishApp/src/main/cpp/stockfish/movepick.cpp
View File

@ -56,45 +56,39 @@ namespace {
/// ordering is at the current node.
/// MovePicker constructor for the main search
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const ButterflyHistory* mh,
const CapturePieceToHistory* cph, const PieceToHistory** ch, Move cm, Move* killers)
: pos(p), mainHistory(mh), captureHistory(cph), continuationHistory(ch),
refutations{{killers[0], 0}, {killers[1], 0}, {cm, 0}}, depth(d) {
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const ButterflyHistory* mh, const LowPlyHistory* lp,
const CapturePieceToHistory* cph, const PieceToHistory** ch, Move cm, Move* killers, int pl)
: pos(p), mainHistory(mh), lowPlyHistory(lp), captureHistory(cph), continuationHistory(ch),
ttMove(ttm), refutations{{killers[0], 0}, {killers[1], 0}, {cm, 0}}, depth(d), ply(pl) {
assert(d > 0);
stage = pos.checkers() ? EVASION_TT : MAIN_TT;
ttMove = ttm && pos.pseudo_legal(ttm) ? ttm : MOVE_NONE;
stage += (ttMove == MOVE_NONE);
stage = (pos.checkers() ? EVASION_TT : MAIN_TT) +
!(ttm && pos.pseudo_legal(ttm));
}
/// MovePicker constructor for quiescence search
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const ButterflyHistory* mh,
const CapturePieceToHistory* cph, const PieceToHistory** ch, Square rs)
: pos(p), mainHistory(mh), captureHistory(cph), continuationHistory(ch), recaptureSquare(rs), depth(d) {
: pos(p), mainHistory(mh), captureHistory(cph), continuationHistory(ch), ttMove(ttm), recaptureSquare(rs), depth(d) {
assert(d <= 0);
stage = pos.checkers() ? EVASION_TT : QSEARCH_TT;
ttMove = ttm
&& (depth > DEPTH_QS_RECAPTURES || to_sq(ttm) == recaptureSquare)
&& pos.pseudo_legal(ttm) ? ttm : MOVE_NONE;
stage += (ttMove == MOVE_NONE);
stage = (pos.checkers() ? EVASION_TT : QSEARCH_TT) +
!(ttm && (depth > DEPTH_QS_RECAPTURES || to_sq(ttm) == recaptureSquare)
&& pos.pseudo_legal(ttm));
}
/// MovePicker constructor for ProbCut: we generate captures with SEE greater
/// than or equal to the given threshold.
MovePicker::MovePicker(const Position& p, Move ttm, Value th, const CapturePieceToHistory* cph)
: pos(p), captureHistory(cph), threshold(th) {
: pos(p), captureHistory(cph), ttMove(ttm), threshold(th) {
assert(!pos.checkers());
stage = PROBCUT_TT;
ttMove = ttm
&& pos.capture(ttm)
stage = PROBCUT_TT + !(ttm && pos.capture(ttm)
&& pos.pseudo_legal(ttm)
&& pos.see_ge(ttm, threshold) ? ttm : MOVE_NONE;
stage += (ttMove == MOVE_NONE);
&& pos.see_ge(ttm, threshold));
}
/// MovePicker::score() assigns a numerical value to each move in a list, used
@ -115,7 +109,8 @@ void MovePicker::score() {
+ 2 * (*continuationHistory[0])[pos.moved_piece(m)][to_sq(m)]
+ 2 * (*continuationHistory[1])[pos.moved_piece(m)][to_sq(m)]
+ 2 * (*continuationHistory[3])[pos.moved_piece(m)][to_sq(m)]
+ (*continuationHistory[5])[pos.moved_piece(m)][to_sq(m)];
+ (*continuationHistory[5])[pos.moved_piece(m)][to_sq(m)]
+ (ply < MAX_LPH ? std::min(4, depth / 3) * (*lowPlyHistory)[ply][from_to(m)] : 0);
else // Type == EVASIONS
{
@ -174,7 +169,7 @@ top:
case GOOD_CAPTURE:
if (select<Best>([&](){
return pos.see_ge(*cur, Value(-55 * cur->value / 1024)) ?
return pos.see_ge(*cur, Value(-69 * cur->value / 1024)) ?
// Move losing capture to endBadCaptures to be tried later
true : (*endBadCaptures++ = *cur, false); }))
return *(cur - 1);

12
DroidFishApp/src/main/cpp/stockfish/movepick.h
View File

@ -88,6 +88,12 @@ enum StatsType { NoCaptures, Captures };
/// the move's from and to squares, see www.chessprogramming.org/Butterfly_Boards
typedef Stats<int16_t, 10692, COLOR_NB, int(SQUARE_NB) * int(SQUARE_NB)> ButterflyHistory;
/// LowPlyHistory at higher depths records successful quiet moves on plies 0 to 3
/// and quiet moves which are/were in the PV (ttPv)
/// It get cleared with each new search and get filled during iterative deepening
constexpr int MAX_LPH = 4;
typedef Stats<int16_t, 10692, MAX_LPH, int(SQUARE_NB) * int(SQUARE_NB)> LowPlyHistory;
/// CounterMoveHistory stores counter moves indexed by [piece][to] of the previous
/// move, see www.chessprogramming.org/Countermove_Heuristic
typedef Stats<Move, NOT_USED, PIECE_NB, SQUARE_NB> CounterMoveHistory;
@ -123,10 +129,12 @@ public:
const PieceToHistory**,
Square);
MovePicker(const Position&, Move, Depth, const ButterflyHistory*,
const LowPlyHistory*,
const CapturePieceToHistory*,
const PieceToHistory**,
Move,
Move*);
Move*,
int);
Move next_move(bool skipQuiets = false);
private:
@ -137,6 +145,7 @@ private:
const Position& pos;
const ButterflyHistory* mainHistory;
const LowPlyHistory* lowPlyHistory;
const CapturePieceToHistory* captureHistory;
const PieceToHistory** continuationHistory;
Move ttMove;
@ -145,6 +154,7 @@ private:
Square recaptureSquare;
Value threshold;
Depth depth;
int ply;
ExtMove moves[MAX_MOVES];
};

37
DroidFishApp/src/main/cpp/stockfish/pawns.cpp
View File

@ -33,12 +33,13 @@ namespace {
// Pawn penalties
constexpr Score Backward = S( 9, 24);
constexpr Score BlockedStorm = S(82, 82);
constexpr Score Doubled = S(11, 56);
constexpr Score Isolated = S( 5, 15);
constexpr Score WeakLever = S( 0, 56);
constexpr Score WeakUnopposed = S(13, 27);
constexpr Score BlockedStorm[RANK_NB] = {S( 0, 0), S( 0, 0), S( 76, 78), S(-10, 15), S(-7, 10), S(-4, 6), S(-1, 2)};
// Connected pawn bonus
constexpr int Connected[RANK_NB] = { 0, 7, 8, 12, 29, 48, 86 };
@ -68,7 +69,7 @@ namespace {
template<Color Us>
Score evaluate(const Position& pos, Pawns::Entry* e) {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
constexpr Direction Up = pawn_push(Us);
Bitboard neighbours, stoppers, support, phalanx, opposed;
@ -86,6 +87,7 @@ namespace {
e->passedPawns[Us] = 0;
e->kingSquares[Us] = SQ_NONE;
e->pawnAttacks[Us] = e->pawnAttacksSpan[Us] = pawn_attacks_bb<Us>(ourPawns);
e->blockedCount += popcount(shift<Up>(ourPawns) & (theirPawns | doubleAttackThem));
// Loop through all pawns of the current color and score each pawn
while ((s = *pl++) != SQ_NONE)
@ -98,8 +100,8 @@ namespace {
opposed = theirPawns & forward_file_bb(Us, s);
blocked = theirPawns & (s + Up);
stoppers = theirPawns & passed_pawn_span(Us, s);
lever = theirPawns & PawnAttacks[Us][s];
leverPush = theirPawns & PawnAttacks[Us][s + Up];
lever = theirPawns & pawn_attacks_bb(Us, s);
leverPush = theirPawns & pawn_attacks_bb(Us, s + Up);
doubled = ourPawns & (s - Up);
neighbours = ourPawns & adjacent_files_bb(s);
phalanx = neighbours & rank_bb(s);
@ -118,12 +120,15 @@ namespace {
// (a) there is no stoppers except some levers
// (b) the only stoppers are the leverPush, but we outnumber them
// (c) there is only one front stopper which can be levered.
// (Refined in Evaluation::passed)
passed = !(stoppers ^ lever)
|| ( !(stoppers ^ leverPush)
&& popcount(phalanx) >= popcount(leverPush))
|| ( stoppers == blocked && r >= RANK_5
&& (shift<Up>(support) & ~(theirPawns | doubleAttackThem)));
passed &= !(forward_file_bb(Us, s) & ourPawns);
// Passed pawns will be properly scored later in evaluation when we have
// full attack info.
if (passed)
@ -132,15 +137,22 @@ namespace {
// Score this pawn
if (support | phalanx)
{
int v = Connected[r] * (2 + bool(phalanx) - bool(opposed))
int v = Connected[r] * (4 + 2 * bool(phalanx) - 2 * bool(opposed) - bool(blocked)) / 2
+ 21 * popcount(support);
score += make_score(v, v * (r - 2) / 4);
}
else if (!neighbours)
{
if ( opposed
&& (ourPawns & forward_file_bb(Them, s))
&& !(theirPawns & adjacent_files_bb(s)))
score -= Doubled;
else
score -= Isolated
+ WeakUnopposed * !opposed;
}
else if (backward)
score -= Backward
@ -172,6 +184,7 @@ Entry* probe(const Position& pos) {
return e;
e->key = key;
e->blockedCount = 0;
e->scores[WHITE] = evaluate<WHITE>(pos, e);
e->scores[BLACK] = evaluate<BLACK>(pos, e);
@ -185,15 +198,15 @@ Entry* probe(const Position& pos) {
template<Color Us>
Score Entry::evaluate_shelter(const Position& pos, Square ksq) {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = ~Us;
Bitboard b = pos.pieces(PAWN) & ~forward_ranks_bb(Them, ksq);
Bitboard ourPawns = b & pos.pieces(Us);
Bitboard ourPawns = b & pos.pieces(Us) & ~pawnAttacks[Them];
Bitboard theirPawns = b & pos.pieces(Them);
Score bonus = make_score(5, 5);
File center = clamp(file_of(ksq), FILE_B, FILE_G);
File center = Utility::clamp(file_of(ksq), FILE_B, FILE_G);
for (File f = File(center - 1); f <= File(center + 1); ++f)
{
b = ourPawns & file_bb(f);
@ -202,11 +215,11 @@ Score Entry::evaluate_shelter(const Position& pos, Square ksq) {
b = theirPawns & file_bb(f);
int theirRank = b ? relative_rank(Us, frontmost_sq(Them, b)) : 0;
File d = map_to_queenside(f);
int d = edge_distance(f);
bonus += make_score(ShelterStrength[d][ourRank], 0);
if (ourRank && (ourRank == theirRank - 1))
bonus -= BlockedStorm * int(theirRank == RANK_3);
bonus -= BlockedStorm[theirRank];
else
bonus -= make_score(UnblockedStorm[d][theirRank], 0);
}
@ -238,9 +251,9 @@ Score Entry::do_king_safety(const Position& pos) {
// In endgame we like to bring our king near our closest pawn
Bitboard pawns = pos.pieces(Us, PAWN);
int minPawnDist = pawns ? 8 : 0;
int minPawnDist = 6;
if (pawns & PseudoAttacks[KING][ksq])
if (pawns & attacks_bb<KING>(ksq))
minPawnDist = 1;
else while (pawns)
minPawnDist = std::min(minPawnDist, distance(ksq, pop_lsb(&pawns)));

2
DroidFishApp/src/main/cpp/stockfish/pawns.h
View File

@ -38,6 +38,7 @@ struct Entry {
Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
int passed_count() const { return popcount(passedPawns[WHITE] | passedPawns[BLACK]); }
int blocked_count() const { return blockedCount; }
template<Color Us>
Score king_safety(const Position& pos) {
@ -59,6 +60,7 @@ struct Entry {
Square kingSquares[COLOR_NB];
Score kingSafety[COLOR_NB];
int castlingRights[COLOR_NB];
int blockedCount;
};
typedef HashTable<Entry, 131072> Table;

77
DroidFishApp/src/main/cpp/stockfish/position.cpp
View File

@ -64,10 +64,11 @@ std::ostream& operator<<(std::ostream& os, const Position& pos) {
for (File f = FILE_A; f <= FILE_H; ++f)
os << " | " << PieceToChar[pos.piece_on(make_square(f, r))];
os << " |\n +---+---+---+---+---+---+---+---+\n";
os << " | " << (1 + r) << "\n +---+---+---+---+---+---+---+---+\n";
}
os << "\nFen: " << pos.fen() << "\nKey: " << std::hex << std::uppercase
os << " a b c d e f g h\n"
<< "\nFen: " << pos.fen() << "\nKey: " << std::hex << std::uppercase
<< std::setfill('0') << std::setw(16) << pos.key()
<< std::setfill(' ') << std::dec << "\nCheckers: ";
@ -139,7 +140,7 @@ void Position::init() {
for (Piece pc : Pieces)
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
for (Square s2 = Square(s1 + 1); s2 <= SQ_H8; ++s2)
if (PseudoAttacks[type_of(pc)][s1] & s2)
if ((type_of(pc) != PAWN) && (attacks_bb(type_of(pc), s1, 0) & s2))
{
Move move = make_move(s1, s2);
Key key = Zobrist::psq[pc][s1] ^ Zobrist::psq[pc][s2] ^ Zobrist::side;
@ -306,7 +307,7 @@ void Position::set_castling_right(Color c, Square rfrom) {
Square rto = relative_square(c, cr & KING_SIDE ? SQ_F1 : SQ_D1);
castlingPath[cr] = (between_bb(rfrom, rto) | between_bb(kfrom, kto) | rto | kto)
& ~(square_bb(kfrom) | rfrom);
& ~(kfrom | rfrom);
}
@ -319,10 +320,10 @@ void Position::set_check_info(StateInfo* si) const {
Square ksq = square<KING>(~sideToMove);
si->checkSquares[PAWN] = attacks_from<PAWN>(ksq, ~sideToMove);
si->checkSquares[KNIGHT] = attacks_from<KNIGHT>(ksq);
si->checkSquares[BISHOP] = attacks_from<BISHOP>(ksq);
si->checkSquares[ROOK] = attacks_from<ROOK>(ksq);
si->checkSquares[PAWN] = pawn_attacks_bb(~sideToMove, ksq);
si->checkSquares[KNIGHT] = attacks_bb<KNIGHT>(ksq);
si->checkSquares[BISHOP] = attacks_bb<BISHOP>(ksq, pieces());
si->checkSquares[ROOK] = attacks_bb<ROOK>(ksq, pieces());
si->checkSquares[QUEEN] = si->checkSquares[BISHOP] | si->checkSquares[ROOK];
si->checkSquares[KING] = 0;
}
@ -375,11 +376,13 @@ void Position::set_state(StateInfo* si) const {
Position& Position::set(const string& code, Color c, StateInfo* si) {
assert(code.length() > 0 && code.length() < 8);
assert(code[0] == 'K');
string sides[] = { code.substr(code.find('K', 1)), // Weak
code.substr(0, code.find('K', 1)) }; // Strong
code.substr(0, std::min(code.find('v'), code.find('K', 1))) }; // Strong
assert(sides[0].length() > 0 && sides[0].length() < 8);
assert(sides[1].length() > 0 && sides[1].length() < 8);
std::transform(sides[c].begin(), sides[c].end(), sides[c].begin(), tolower);
@ -453,8 +456,8 @@ Bitboard Position::slider_blockers(Bitboard sliders, Square s, Bitboard& pinners
pinners = 0;
// Snipers are sliders that attack 's' when a piece and other snipers are removed
Bitboard snipers = ( (PseudoAttacks[ ROOK][s] & pieces(QUEEN, ROOK))
| (PseudoAttacks[BISHOP][s] & pieces(QUEEN, BISHOP))) & sliders;
Bitboard snipers = ( (attacks_bb< ROOK>(s) & pieces(QUEEN, ROOK))
| (attacks_bb<BISHOP>(s) & pieces(QUEEN, BISHOP))) & sliders;
Bitboard occupancy = pieces() ^ snipers;
while (snipers)
@ -478,12 +481,12 @@ Bitboard Position::slider_blockers(Bitboard sliders, Square s, Bitboard& pinners
Bitboard Position::attackers_to(Square s, Bitboard occupied) const {
return (attacks_from<PAWN>(s, BLACK) & pieces(WHITE, PAWN))
| (attacks_from<PAWN>(s, WHITE) & pieces(BLACK, PAWN))
| (attacks_from<KNIGHT>(s) & pieces(KNIGHT))
return (pawn_attacks_bb(BLACK, s) & pieces(WHITE, PAWN))
| (pawn_attacks_bb(WHITE, s) & pieces(BLACK, PAWN))
| (attacks_bb<KNIGHT>(s) & pieces(KNIGHT))
| (attacks_bb< ROOK>(s, occupied) & pieces( ROOK, QUEEN))
| (attacks_bb<BISHOP>(s, occupied) & pieces(BISHOP, QUEEN))
| (attacks_from<KING>(s) & pieces(KING));
| (attacks_bb<KING>(s) & pieces(KING));
}
@ -586,15 +589,15 @@ bool Position::pseudo_legal(const Move m) const {
if ((Rank8BB | Rank1BB) & to)
return false;
if ( !(attacks_from<PAWN>(from, us) & pieces(~us) & to) // Not a capture
if ( !(pawn_attacks_bb(us, from) & pieces(~us) & to) // Not a capture
&& !((from + pawn_push(us) == to) && empty(to)) // Not a single push
&& !( (from + 2 * pawn_push(us) == to) // Not a double push
&& (rank_of(from) == relative_rank(us, RANK_2))
&& (relative_rank(us, from) == RANK_2)
&& empty(to)
&& empty(to - pawn_push(us))))
return false;
}
else if (!(attacks_from(type_of(pc), from) & to))
else if (!(attacks_bb(type_of(pc), from, pieces()) & to))
return false;
// Evasions generator already takes care to avoid some kind of illegal moves
@ -633,11 +636,11 @@ bool Position::gives_check(Move m) const {
Square to = to_sq(m);
// Is there a direct check?
if (st->checkSquares[type_of(piece_on(from))] & to)
if (check_squares(type_of(piece_on(from))) & to)
return true;
// Is there a discovered check?
if ( (st->blockersForKing[~sideToMove] & from)
if ( (blockers_for_king(~sideToMove) & from)
&& !aligned(from, to, square<KING>(~sideToMove)))
return true;
@ -664,11 +667,11 @@ bool Position::gives_check(Move m) const {
case CASTLING:
{
Square kfrom = from;
Square rfrom = to; // Castling is encoded as 'King captures the rook'
Square rfrom = to; // Castling is encoded as 'king captures the rook'
Square kto = relative_square(sideToMove, rfrom > kfrom ? SQ_G1 : SQ_C1);
Square rto = relative_square(sideToMove, rfrom > kfrom ? SQ_F1 : SQ_D1);
return (PseudoAttacks[ROOK][rto] & square<KING>(~sideToMove))
return (attacks_bb<ROOK>(rto) & square<KING>(~sideToMove))
&& (attacks_bb<ROOK>(rto, (pieces() ^ kfrom ^ rfrom) | rto | kto) & square<KING>(~sideToMove));
}
default:
@ -743,8 +746,6 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
assert(relative_rank(us, to) == RANK_6);
assert(piece_on(to) == NO_PIECE);
assert(piece_on(capsq) == make_piece(them, PAWN));
board[capsq] = NO_PIECE; // Not done by remove_piece()
}
st->pawnKey ^= Zobrist::psq[captured][capsq];
@ -753,7 +754,10 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
st->nonPawnMaterial[them] -= PieceValue[MG][captured];
// Update board and piece lists
remove_piece(captured, capsq);
remove_piece(capsq);
if (type_of(m) == ENPASSANT)
board[capsq] = NO_PIECE;
// Update material hash key and prefetch access to materialTable
k ^= Zobrist::psq[captured][capsq];
@ -784,14 +788,14 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
// Move the piece. The tricky Chess960 castling is handled earlier
if (type_of(m) != CASTLING)
move_piece(pc, from, to);
move_piece(from, to);
// If the moving piece is a pawn do some special extra work
if (type_of(pc) == PAWN)
{
// Set en-passant square if the moved pawn can be captured
if ( (int(to) ^ int(from)) == 16
&& (attacks_from<PAWN>(to - pawn_push(us), us) & pieces(them, PAWN)))
&& (pawn_attacks_bb(us, to - pawn_push(us)) & pieces(them, PAWN)))
{
st->epSquare = to - pawn_push(us);
k ^= Zobrist::enpassant[file_of(st->epSquare)];
@ -804,7 +808,7 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
assert(relative_rank(us, to) == RANK_8);
assert(type_of(promotion) >= KNIGHT && type_of(promotion) <= QUEEN);
remove_piece(pc, to);
remove_piece(to);
put_piece(promotion, to);
// Update hash keys
@ -884,7 +888,7 @@ void Position::undo_move(Move m) {
assert(type_of(pc) == promotion_type(m));
assert(type_of(pc) >= KNIGHT && type_of(pc) <= QUEEN);
remove_piece(pc, to);
remove_piece(to);
pc = make_piece(us, PAWN);
put_piece(pc, to);
}
@ -896,7 +900,7 @@ void Position::undo_move(Move m) {
}
else
{
move_piece(pc, to, from); // Put the piece back at the source square
move_piece(to, from); // Put the piece back at the source square
if (st->capturedPiece)
{
@ -936,9 +940,9 @@ void Position::do_castling(Color us, Square from, Square& to, Square& rfrom, Squ
to = relative_square(us, kingSide ? SQ_G1 : SQ_C1);
// Remove both pieces first since squares could overlap in Chess960
remove_piece(make_piece(us, KING), Do ? from : to);
remove_piece(make_piece(us, ROOK), Do ? rfrom : rto);
board[Do ? from : to] = board[Do ? rfrom : rto] = NO_PIECE; // Since remove_piece doesn't do it for us
remove_piece(Do ? from : to);
remove_piece(Do ? rfrom : rto);
board[Do ? from : to] = board[Do ? rfrom : rto] = NO_PIECE; // Since remove_piece doesn't do this for us
put_piece(make_piece(us, KING), Do ? to : from);
put_piece(make_piece(us, ROOK), Do ? rto : rfrom);
}
@ -1118,10 +1122,7 @@ bool Position::is_draw(int ply) const {
// Return a draw score if a position repeats once earlier but strictly
// after the root, or repeats twice before or at the root.
if (st->repetition && st->repetition < ply)
return true;
return false;
return st->repetition && st->repetition < ply;
}

78
DroidFishApp/src/main/cpp/stockfish/position.h
View File

@ -83,7 +83,6 @@ public:
const std::string fen() const;
// Position representation
Bitboard pieces() const;
Bitboard pieces(PieceType pt) const;
Bitboard pieces(PieceType pt1, PieceType pt2) const;
Bitboard pieces(Color c) const;
@ -99,7 +98,7 @@ public:
bool is_on_semiopen_file(Color c, Square s) const;
// Castling
int castling_rights(Color c) const;
CastlingRights castling_rights(Color c) const;
bool can_castle(CastlingRights cr) const;
bool castling_impeded(CastlingRights cr) const;
Square castling_rook_square(CastlingRights cr) const;
@ -113,9 +112,6 @@ public:
// Attacks to/from a given square
Bitboard attackers_to(Square s) const;
Bitboard attackers_to(Square s, Bitboard occupied) const;
Bitboard attacks_from(PieceType pt, Square s) const;
template<PieceType> Bitboard attacks_from(Square s) const;
template<PieceType> Bitboard attacks_from(Square s, Color c) const;
Bitboard slider_blockers(Bitboard sliders, Square s, Bitboard& pinners) const;
// Properties of moves
@ -174,8 +170,8 @@ private:
// Other helpers
void put_piece(Piece pc, Square s);
void remove_piece(Piece pc, Square s);
void move_piece(Piece pc, Square from, Square to);
void remove_piece(Square s);
void move_piece(Square from, Square to);
template<bool Do>
void do_castling(Color us, Square from, Square& to, Square& rfrom, Square& rto);
@ -207,28 +203,25 @@ inline Color Position::side_to_move() const {
return sideToMove;
}
inline bool Position::empty(Square s) const {
return board[s] == NO_PIECE;
}
inline Piece Position::piece_on(Square s) const {
assert(is_ok(s));
return board[s];
}
inline bool Position::empty(Square s) const {
return piece_on(s) == NO_PIECE;
}
inline Piece Position::moved_piece(Move m) const {
return board[from_sq(m)];
return piece_on(from_sq(m));
}
inline Bitboard Position::pieces() const {
return byTypeBB[ALL_PIECES];
}
inline Bitboard Position::pieces(PieceType pt) const {
inline Bitboard Position::pieces(PieceType pt = ALL_PIECES) const {
return byTypeBB[pt];
}
inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const {
return byTypeBB[pt1] | byTypeBB[pt2];
return pieces(pt1) | pieces(pt2);
}
inline Bitboard Position::pieces(Color c) const {
@ -236,11 +229,11 @@ inline Bitboard Position::pieces(Color c) const {
}
inline Bitboard Position::pieces(Color c, PieceType pt) const {
return byColorBB[c] & byTypeBB[pt];
return pieces(c) & pieces(pt);
}
inline Bitboard Position::pieces(Color c, PieceType pt1, PieceType pt2) const {
return byColorBB[c] & (byTypeBB[pt1] | byTypeBB[pt2]);
return pieces(c) & (pieces(pt1) | pieces(pt2));
}
template<PieceType Pt> inline int Position::count(Color c) const {
@ -248,7 +241,7 @@ template<PieceType Pt> inline int Position::count(Color c) const {
}
template<PieceType Pt> inline int Position::count() const {
return pieceCount[make_piece(WHITE, Pt)] + pieceCount[make_piece(BLACK, Pt)];
return count<Pt>(WHITE) + count<Pt>(BLACK);
}
template<PieceType Pt> inline const Square* Position::squares(Color c) const {
@ -257,7 +250,7 @@ template<PieceType Pt> inline const Square* Position::squares(Color c) const {
template<PieceType Pt> inline Square Position::square(Color c) const {
assert(pieceCount[make_piece(c, Pt)] == 1);
return pieceList[make_piece(c, Pt)][0];
return squares<Pt>(c)[0];
}
inline Square Position::ep_square() const {
@ -272,14 +265,14 @@ inline bool Position::can_castle(CastlingRights cr) const {
return st->castlingRights & cr;
}
inline int Position::castling_rights(Color c) const {
return st->castlingRights & (c == WHITE ? WHITE_CASTLING : BLACK_CASTLING);
inline CastlingRights Position::castling_rights(Color c) const {
return c & CastlingRights(st->castlingRights);
}
inline bool Position::castling_impeded(CastlingRights cr) const {
assert(cr == WHITE_OO || cr == WHITE_OOO || cr == BLACK_OO || cr == BLACK_OOO);
return byTypeBB[ALL_PIECES] & castlingPath[cr];
return pieces() & castlingPath[cr];
}
inline Square Position::castling_rook_square(CastlingRights cr) const {
@ -288,26 +281,8 @@ inline Square Position::castling_rook_square(CastlingRights cr) const {
return castlingRookSquare[cr];
}
template<PieceType Pt>
inline Bitboard Position::attacks_from(Square s) const {
static_assert(Pt != PAWN, "Pawn attacks need color");
return Pt == BISHOP || Pt == ROOK ? attacks_bb<Pt>(s, byTypeBB[ALL_PIECES])
: Pt == QUEEN ? attacks_from<ROOK>(s) | attacks_from<BISHOP>(s)
: PseudoAttacks[Pt][s];
}
template<>
inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
return PawnAttacks[c][s];
}
inline Bitboard Position::attacks_from(PieceType pt, Square s) const {
return attacks_bb(pt, s, byTypeBB[ALL_PIECES]);
}
inline Bitboard Position::attackers_to(Square s) const {
return attackers_to(s, byTypeBB[ALL_PIECES]);
return attackers_to(s, pieces());
}
inline Bitboard Position::checkers() const {
@ -360,7 +335,7 @@ inline Value Position::non_pawn_material(Color c) const {
}
inline Value Position::non_pawn_material() const {
return st->nonPawnMaterial[WHITE] + st->nonPawnMaterial[BLACK];
return non_pawn_material(WHITE) + non_pawn_material(BLACK);
}
inline int Position::game_ply() const {
@ -372,8 +347,8 @@ inline int Position::rule50_count() const {
}
inline bool Position::opposite_bishops() const {
return pieceCount[W_BISHOP] == 1
&& pieceCount[B_BISHOP] == 1
return count<BISHOP>(WHITE) == 1
&& count<BISHOP>(BLACK) == 1
&& opposite_colors(square<BISHOP>(WHITE), square<BISHOP>(BLACK));
}
@ -403,8 +378,7 @@ inline Thread* Position::this_thread() const {
inline void Position::put_piece(Piece pc, Square s) {
board[s] = pc;
byTypeBB[ALL_PIECES] |= s;
byTypeBB[type_of(pc)] |= s;
byTypeBB[ALL_PIECES] |= byTypeBB[type_of(pc)] |= s;
byColorBB[color_of(pc)] |= s;
index[s] = pieceCount[pc]++;
pieceList[pc][index[s]] = s;
@ -412,12 +386,13 @@ inline void Position::put_piece(Piece pc, Square s) {
psq += PSQT::psq[pc][s];
}
inline void Position::remove_piece(Piece pc, Square s) {
inline void Position::remove_piece(Square s) {
// WARNING: This is not a reversible operation. If we remove a piece in
// do_move() and then replace it in undo_move() we will put it at the end of
// the list and not in its original place, it means index[] and pieceList[]
// are not invariant to a do_move() + undo_move() sequence.
Piece pc = board[s];
byTypeBB[ALL_PIECES] ^= s;
byTypeBB[type_of(pc)] ^= s;
byColorBB[color_of(pc)] ^= s;
@ -430,10 +405,11 @@ inline void Position::remove_piece(Piece pc, Square s) {
psq -= PSQT::psq[pc][s];
}
inline void Position::move_piece(Piece pc, Square from, Square to) {
inline void Position::move_piece(Square from, Square to) {
// index[from] is not updated and becomes stale. This works as long as index[]
// is accessed just by known occupied squares.
Piece pc = board[from];
Bitboard fromTo = from | to;
byTypeBB[ALL_PIECES] ^= fromTo;
byTypeBB[type_of(pc)] ^= fromTo;

17
DroidFishApp/src/main/cpp/stockfish/psqt.cpp
View File

@ -21,11 +21,7 @@
#include <algorithm>
#include "types.h"
Value PieceValue[PHASE_NB][PIECE_NB] = {
{ VALUE_ZERO, PawnValueMg, KnightValueMg, BishopValueMg, RookValueMg, QueenValueMg },
{ VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg }
};
#include "bitboard.h"
namespace PSQT {
@ -95,9 +91,9 @@ constexpr Score PBonus[RANK_NB][FILE_NB] =
{ },
{ S( 3,-10), S( 3, -6), S( 10, 10), S( 19, 0), S( 16, 14), S( 19, 7), S( 7, -5), S( -5,-19) },
{ S( -9,-10), S(-15,-10), S( 11,-10), S( 15, 4), S( 32, 4), S( 22, 3), S( 5, -6), S(-22, -4) },
{ S( -8, 6), S(-23, -2), S( 6, -8), S( 20, -4), S( 40,-13), S( 17,-12), S( 4,-10), S(-12, -9) },
{ S( -4, 6), S(-23, -2), S( 6, -8), S( 20, -4), S( 40,-13), S( 17,-12), S( 4,-10), S( -8, -9) },
{ S( 13, 9), S( 0, 4), S(-13, 3), S( 1,-12), S( 11,-12), S( -2, -6), S(-13, 13), S( 5, 8) },
{ S( -5, 28), S(-12, 20), S( -7, 21), S( 22, 28), S( -8, 30), S( -5, 7), S(-15, 6), S(-18, 13) },
{ S( 5, 28), S(-12, 20), S( -7, 21), S( 22, 28), S( -8, 30), S( -5, 7), S(-15, 6), S( -8, 13) },
{ S( -7, 0), S( 7,-11), S( -3, 12), S(-13, 21), S( 5, 25), S(-16, 19), S( 10, 4), S( -8, 7) }
};
@ -112,17 +108,14 @@ void init() {
for (Piece pc = W_PAWN; pc <= W_KING; ++pc)
{
PieceValue[MG][~pc] = PieceValue[MG][pc];
PieceValue[EG][~pc] = PieceValue[EG][pc];
Score score = make_score(PieceValue[MG][pc], PieceValue[EG][pc]);
for (Square s = SQ_A1; s <= SQ_H8; ++s)
{
File f = map_to_queenside(file_of(s));
File f = File(edge_distance(file_of(s)));
psq[ pc][ s] = score + (type_of(pc) == PAWN ? PBonus[rank_of(s)][file_of(s)]
: Bonus[pc][rank_of(s)][f]);
psq[~pc][~s] = -psq[pc][s];
psq[~pc][flip_rank(s)] = -psq[pc][s];
}
}
}

400
DroidFishApp/src/main/cpp/stockfish/search.cpp
View File

@ -61,13 +61,13 @@ namespace {
// Different node types, used as a template parameter
enum NodeType { NonPV, PV };
constexpr uint64_t ttHitAverageWindow = 4096;
constexpr uint64_t ttHitAverageResolution = 1024;
constexpr uint64_t TtHitAverageWindow = 4096;
constexpr uint64_t TtHitAverageResolution = 1024;
// Razor and futility margins
constexpr int RazorMargin = 531;
constexpr int RazorMargin = 527;
Value futility_margin(Depth d, bool improving) {
return Value(217 * (d - improving));
return Value(227 * (d - improving));
}
// Reductions lookup table, initialized at startup
@ -75,16 +75,16 @@ namespace {
Depth reduction(bool i, Depth d, int mn) {
int r = Reductions[d] * Reductions[mn];
return (r + 511) / 1024 + (!i && r > 1007);
return (r + 570) / 1024 + (!i && r > 1018);
}
constexpr int futility_move_count(bool improving, Depth depth) {
return (5 + depth * depth) * (1 + improving) / 2 - 1;
return (3 + depth * depth) / (2 - improving);
}
// History and stats update bonus, based on depth
int stat_bonus(Depth d) {
return d > 15 ? -8 : 19 * d * d + 155 * d - 132;
return d > 15 ? 27 : 17 * d * d + 133 * d - 134;
}
// Add a small random component to draw evaluations to avoid 3fold-blindness
@ -156,7 +156,7 @@ namespace {
Value value_from_tt(Value v, int ply, int r50c);
void update_pv(Move* pv, Move move, Move* childPv);
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus);
void update_quiet_stats(const Position& pos, Stack* ss, Move move, int bonus);
void update_quiet_stats(const Position& pos, Stack* ss, Move move, int bonus, int depth);
void update_all_stats(const Position& pos, Stack* ss, Move bestMove, Value bestValue, Value beta, Square prevSq,
Move* quietsSearched, int quietCount, Move* capturesSearched, int captureCount, Depth depth);
@ -194,7 +194,7 @@ namespace {
void Search::init() {
for (int i = 1; i < MAX_MOVES; ++i)
Reductions[i] = int((24.8 + std::log(Threads.size()) / 2) * std::log(i));
Reductions[i] = int((24.8 + std::log(Threads.size())) * std::log(i));
}
@ -236,14 +236,8 @@ void MainThread::search() {
}
else
{
for (Thread* th : Threads)
{
th->bestMoveChanges = 0;
if (th != this)
th->start_searching();
}
Thread::search(); // Let's start searching!
Threads.start_searching(); // start non-main threads
Thread::search(); // main thread start searching
}
// When we reach the maximum depth, we can arrive here without a raise of
@ -260,9 +254,7 @@ void MainThread::search() {
Threads.stop = true;
// Wait until all threads have finished
for (Thread* th : Threads)
if (th != this)
th->wait_for_search_finished();
Threads.wait_for_search_finished();
// When playing in 'nodes as time' mode, subtract the searched nodes from
// the available ones before exiting.
@ -271,38 +263,13 @@ void MainThread::search() {
Thread* bestThread = this;
// Check if there are threads with a better score than main thread
if ( Options["MultiPV"] == 1
&& !Limits.depth
&& !(Skill(Options["Skill Level"]).enabled() || Options["UCI_LimitStrength"])
&& rootMoves[0].pv[0] != MOVE_NONE)
{
std::map<Move, int64_t> votes;
Value minScore = this->rootMoves[0].score;
if (int(Options["MultiPV"]) == 1 &&
!Limits.depth &&
!(Skill(Options["Skill Level"]).enabled() || int(Options["UCI_LimitStrength"])) &&
rootMoves[0].pv[0] != MOVE_NONE)
bestThread = Threads.get_best_thread();
// Find out minimum score
for (Thread* th: Threads)
minScore = std::min(minScore, th->rootMoves[0].score);
// Vote according to score and depth, and select the best thread
for (Thread* th : Threads)
{
votes[th->rootMoves[0].pv[0]] +=
(th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
if (bestThread->rootMoves[0].score >= VALUE_MATE_IN_MAX_PLY)
{
// Make sure we pick the shortest mate
if (th->rootMoves[0].score > bestThread->rootMoves[0].score)
bestThread = th;
}
else if ( th->rootMoves[0].score >= VALUE_MATE_IN_MAX_PLY
|| votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]])
bestThread = th;
}
}
previousScore = bestThread->rootMoves[0].score;
bestPreviousScore = bestThread->rootMoves[0].score;
// Send again PV info if we have a new best thread
if (bestThread != this)
@ -348,15 +315,18 @@ void Thread::search() {
if (mainThread)
{
if (mainThread->previousScore == VALUE_INFINITE)
for (int i=0; i<4; ++i)
if (mainThread->bestPreviousScore == VALUE_INFINITE)
for (int i = 0; i < 4; ++i)
mainThread->iterValue[i] = VALUE_ZERO;
else
for (int i=0; i<4; ++i)
mainThread->iterValue[i] = mainThread->previousScore;
for (int i = 0; i < 4; ++i)
mainThread->iterValue[i] = mainThread->bestPreviousScore;
}
size_t multiPV = Options["MultiPV"];
std::copy(&lowPlyHistory[2][0], &lowPlyHistory.back().back() + 1, &lowPlyHistory[0][0]);
std::fill(&lowPlyHistory[MAX_LPH - 2][0], &lowPlyHistory.back().back() + 1, 0);
size_t multiPV = size_t(Options["MultiPV"]);
// Pick integer skill levels, but non-deterministically round up or down
// such that the average integer skill corresponds to the input floating point one.
@ -365,7 +335,7 @@ void Thread::search() {
// for match (TC 60+0.6) results spanning a wide range of k values.
PRNG rng(now());
double floatLevel = Options["UCI_LimitStrength"] ?
clamp(std::pow((Options["UCI_Elo"] - 1346.6) / 143.4, 1 / 0.806), 0.0, 20.0) :
Utility::clamp(std::pow((Options["UCI_Elo"] - 1346.6) / 143.4, 1 / 0.806), 0.0, 20.0) :
double(Options["Skill Level"]);
int intLevel = int(floatLevel) +
((floatLevel - int(floatLevel)) * 1024 > rng.rand<unsigned>() % 1024 ? 1 : 0);
@ -377,7 +347,7 @@ void Thread::search() {
multiPV = std::max(multiPV, (size_t)4);
multiPV = std::min(multiPV, rootMoves.size());
ttHitAverage = ttHitAverageWindow * ttHitAverageResolution / 2;
ttHitAverage = TtHitAverageWindow * TtHitAverageResolution / 2;
int ct = int(Options["Contempt"]) * PawnValueEg / 100; // From centipawns
@ -432,13 +402,13 @@ void Thread::search() {
// Reset aspiration window starting size
if (rootDepth >= 4)
{
Value previousScore = rootMoves[pvIdx].previousScore;
delta = Value(21 + abs(previousScore) / 256);
alpha = std::max(previousScore - delta,-VALUE_INFINITE);
beta = std::min(previousScore + delta, VALUE_INFINITE);
Value prev = rootMoves[pvIdx].previousScore;
delta = Value(19);
alpha = std::max(prev - delta,-VALUE_INFINITE);
beta = std::min(prev + delta, VALUE_INFINITE);
// Adjust contempt based on root move's previousScore (dynamic contempt)
int dct = ct + (102 - ct / 2) * previousScore / (abs(previousScore) + 157);
int dct = ct + (110 - ct / 2) * prev / (abs(prev) + 140);
contempt = (us == WHITE ? make_score(dct, dct / 2)
: -make_score(dct, dct / 2));
@ -536,13 +506,13 @@ void Thread::search() {
&& !Threads.stop
&& !mainThread->stopOnPonderhit)
{
double fallingEval = (332 + 6 * (mainThread->previousScore - bestValue)
+ 6 * (mainThread->iterValue[iterIdx] - bestValue)) / 704.0;
fallingEval = clamp(fallingEval, 0.5, 1.5);
double fallingEval = (296 + 6 * (mainThread->bestPreviousScore - bestValue)
+ 6 * (mainThread->iterValue[iterIdx] - bestValue)) / 725.0;
fallingEval = Utility::clamp(fallingEval, 0.5, 1.5);
// If the bestMove is stable over several iterations, reduce time accordingly
timeReduction = lastBestMoveDepth + 9 < completedDepth ? 1.94 : 0.91;
double reduction = (1.41 + mainThread->previousTimeReduction) / (2.27 * timeReduction);
timeReduction = lastBestMoveDepth + 10 < completedDepth ? 1.92 : 0.95;
double reduction = (1.47 + mainThread->previousTimeReduction) / (2.22 * timeReduction);
// Use part of the gained time from a previous stable move for the current move
for (Thread* th : Threads)
@ -552,9 +522,11 @@ void Thread::search() {
}
double bestMoveInstability = 1 + totBestMoveChanges / Threads.size();
// Stop the search if we have only one legal move, or if available time elapsed
if ( rootMoves.size() == 1
|| Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability)
double totalTime = rootMoves.size() == 1 ? 0 :
Time.optimum() * fallingEval * reduction * bestMoveInstability;
// Stop the search if we have exceeded the totalTime, at least 1ms search.
if (Time.elapsed() > totalTime)
{
// If we are allowed to ponder do not stop the search now but
// keep pondering until the GUI sends "ponderhit" or "stop".
@ -565,7 +537,7 @@ void Thread::search() {
}
else if ( Threads.increaseDepth
&& !mainThread->ponder
&& Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability * 0.6)
&& Time.elapsed() > totalTime * 0.56)
Threads.increaseDepth = false;
else
Threads.increaseDepth = true;
@ -625,14 +597,15 @@ namespace {
Move ttMove, move, excludedMove, bestMove;
Depth extension, newDepth;
Value bestValue, value, ttValue, eval, maxValue;
bool ttHit, ttPv, inCheck, givesCheck, improving, didLMR, priorCapture;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning, ttCapture, singularLMR;
bool ttHit, ttPv, formerPv, givesCheck, improving, didLMR, priorCapture;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning,
ttCapture, singularQuietLMR;
Piece movedPiece;
int moveCount, captureCount, quietCount;
// Step 1. Initialize node
Thread* thisThread = pos.this_thread();
inCheck = pos.checkers();
ss->inCheck = pos.checkers();
priorCapture = pos.captured_piece();
Color us = pos.side_to_move();
moveCount = captureCount = quietCount = ss->moveCount = 0;
@ -653,7 +626,7 @@ namespace {
if ( Threads.stop.load(std::memory_order_relaxed)
|| pos.is_draw(ss->ply)
|| ss->ply >= MAX_PLY)
return (ss->ply >= MAX_PLY && !inCheck) ? evaluate(pos)
return (ss->ply >= MAX_PLY && !ss->inCheck) ? evaluate(pos)
: value_draw(pos.this_thread());
// Step 3. Mate distance pruning. Even if we mate at the next move our score
@ -689,15 +662,20 @@ namespace {
// search to overwrite a previous full search TT value, so we use a different
// position key in case of an excluded move.
excludedMove = ss->excludedMove;
posKey = pos.key() ^ Key(excludedMove << 16); // Isn't a very good hash
posKey = pos.key() ^ (Key(excludedMove) << 48); // Isn't a very good hash
tte = TT.probe(posKey, ttHit);
ttValue = ttHit ? value_from_tt(tte->value(), ss->ply, pos.rule50_count()) : VALUE_NONE;
ttMove = rootNode ? thisThread->rootMoves[thisThread->pvIdx].pv[0]
: ttHit ? tte->move() : MOVE_NONE;
ttPv = PvNode || (ttHit && tte->is_pv());
formerPv = ttPv && !PvNode;
if (ttPv && depth > 12 && ss->ply - 1 < MAX_LPH && !pos.captured_piece() && is_ok((ss-1)->currentMove))
thisThread->lowPlyHistory[ss->ply - 1][from_to((ss-1)->currentMove)] << stat_bonus(depth - 5);
// thisThread->ttHitAverage can be used to approximate the running average of ttHit
thisThread->ttHitAverage = (ttHitAverageWindow - 1) * thisThread->ttHitAverage / ttHitAverageWindow
+ ttHitAverageResolution * ttHit;
thisThread->ttHitAverage = (TtHitAverageWindow - 1) * thisThread->ttHitAverage / TtHitAverageWindow
+ TtHitAverageResolution * ttHit;
// At non-PV nodes we check for an early TT cutoff
if ( !PvNode
@ -713,7 +691,7 @@ namespace {
if (ttValue >= beta)
{
if (!pos.capture_or_promotion(ttMove))
update_quiet_stats(pos, ss, ttMove, stat_bonus(depth));
update_quiet_stats(pos, ss, ttMove, stat_bonus(depth), depth);
// Extra penalty for early quiet moves of the previous ply
if ((ss-1)->moveCount <= 2 && !priorCapture)
@ -755,8 +733,9 @@ namespace {
int drawScore = TB::UseRule50 ? 1 : 0;
value = wdl < -drawScore ? -VALUE_MATE + MAX_PLY + ss->ply + 1
: wdl > drawScore ? VALUE_MATE - MAX_PLY - ss->ply - 1
// use the range VALUE_MATE_IN_MAX_PLY to VALUE_TB_WIN_IN_MAX_PLY to score
value = wdl < -drawScore ? VALUE_MATED_IN_MAX_PLY + ss->ply + 1
: wdl > drawScore ? VALUE_MATE_IN_MAX_PLY - ss->ply - 1
: VALUE_DRAW + 2 * wdl * drawScore;
Bound b = wdl < -drawScore ? BOUND_UPPER
@ -783,8 +762,10 @@ namespace {
}
}
CapturePieceToHistory& captureHistory = thisThread->captureHistory;
// Step 6. Static evaluation of the position
if (inCheck)
if (ss->inCheck)
{
ss->staticEval = eval = VALUE_NONE;
improving = false;
@ -814,19 +795,19 @@ namespace {
ss->staticEval = eval = evaluate(pos) + bonus;
}
else
ss->staticEval = eval = -(ss-1)->staticEval + 2 * Eval::Tempo;
ss->staticEval = eval = -(ss-1)->staticEval + 2 * Tempo;
tte->save(posKey, VALUE_NONE, ttPv, BOUND_NONE, DEPTH_NONE, MOVE_NONE, eval);
}
// Step 7. Razoring (~1 Elo)
if ( !rootNode // The required rootNode PV handling is not available in qsearch
&& depth < 2
&& depth == 1
&& eval <= alpha - RazorMargin)
return qsearch<NT>(pos, ss, alpha, beta);
improving = (ss-2)->staticEval == VALUE_NONE ? (ss->staticEval >= (ss-4)->staticEval
|| (ss-4)->staticEval == VALUE_NONE) : ss->staticEval >= (ss-2)->staticEval;
improving = (ss-2)->staticEval == VALUE_NONE ? (ss->staticEval > (ss-4)->staticEval
|| (ss-4)->staticEval == VALUE_NONE) : ss->staticEval > (ss-2)->staticEval;
// Step 8. Futility pruning: child node (~50 Elo)
if ( !PvNode
@ -838,10 +819,10 @@ namespace {
// Step 9. Null move search with verification search (~40 Elo)
if ( !PvNode
&& (ss-1)->currentMove != MOVE_NULL
&& (ss-1)->statScore < 23397
&& (ss-1)->statScore < 23824
&& eval >= beta
&& eval >= ss->staticEval
&& ss->staticEval >= beta - 32 * depth + 292 - improving * 30
&& ss->staticEval >= beta - 33 * depth - 33 * improving + 112 * ttPv + 311
&& !excludedMove
&& pos.non_pawn_material(us)
&& (ss->ply >= thisThread->nmpMinPly || us != thisThread->nmpColor))
@ -849,7 +830,7 @@ namespace {
assert(eval - beta >= 0);
// Null move dynamic reduction based on depth and value
Depth R = (854 + 68 * depth) / 258 + std::min(int(eval - beta) / 192, 3);
Depth R = (737 + 77 * depth) / 246 + std::min(int(eval - beta) / 192, 3);
ss->currentMove = MOVE_NULL;
ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];
@ -862,8 +843,8 @@ namespace {
if (nullValue >= beta)
{
// Do not return unproven mate scores
if (nullValue >= VALUE_MATE_IN_MAX_PLY)
// Do not return unproven mate or TB scores
if (nullValue >= VALUE_TB_WIN_IN_MAX_PLY)
nullValue = beta;
if (thisThread->nmpMinPly || (abs(beta) < VALUE_KNOWN_WIN && depth < 13))
@ -889,15 +870,19 @@ namespace {
// If we have a good enough capture and a reduced search returns a value
// much above beta, we can (almost) safely prune the previous move.
if ( !PvNode
&& depth >= 5
&& abs(beta) < VALUE_MATE_IN_MAX_PLY)
&& depth > 4
&& abs(beta) < VALUE_TB_WIN_IN_MAX_PLY)
{
Value raisedBeta = std::min(beta + 189 - 45 * improving, VALUE_INFINITE);
MovePicker mp(pos, ttMove, raisedBeta - ss->staticEval, &thisThread->captureHistory);
Value raisedBeta = beta + 176 - 49 * improving;
assert(raisedBeta < VALUE_INFINITE);
MovePicker mp(pos, ttMove, raisedBeta - ss->staticEval, &captureHistory);
int probCutCount = 0;
while ( (move = mp.next_move()) != MOVE_NONE
&& probCutCount < 2 + 2 * cutNode)
&& probCutCount < 2 + 2 * cutNode
&& !( move == ttMove
&& tte->depth() >= depth - 4
&& ttValue < raisedBeta))
if (move != excludedMove && pos.legal(move))
{
assert(pos.capture_or_promotion(move));
@ -907,7 +892,7 @@ namespace {
probCutCount++;
ss->currentMove = move;
ss->continuationHistory = &thisThread->continuationHistory[inCheck]
ss->continuationHistory = &thisThread->continuationHistory[ss->inCheck]
[captureOrPromotion]
[pos.moved_piece(move)]
[to_sq(move)];
@ -947,13 +932,15 @@ moves_loop: // When in check, search starts from here
Move countermove = thisThread->counterMoves[pos.piece_on(prevSq)][prevSq];
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
&thisThread->captureHistory,
&thisThread->lowPlyHistory,
&captureHistory,
contHist,
countermove,
ss->killers);
ss->killers,
ss->ply);
value = bestValue;
singularLMR = moveCountPruning = false;
singularQuietLMR = moveCountPruning = false;
ttCapture = ttMove && pos.capture_or_promotion(ttMove);
// Mark this node as being searched
@ -996,17 +983,17 @@ moves_loop: // When in check, search starts from here
// Step 13. Pruning at shallow depth (~200 Elo)
if ( !rootNode
&& pos.non_pawn_material(us)
&& bestValue > VALUE_MATED_IN_MAX_PLY)
&& bestValue > VALUE_TB_LOSS_IN_MAX_PLY)
{
// Skip quiet moves if movecount exceeds our FutilityMoveCount threshold
moveCountPruning = moveCount >= futility_move_count(improving, depth);
if ( !captureOrPromotion
&& !givesCheck)
{
// Reduced depth of the next LMR search
int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount), 0);
if ( !captureOrPromotion
&& !givesCheck)
{
// Countermoves based pruning (~20 Elo)
if ( lmrDepth < 4 + ((ss-1)->statScore > 0 || (ss-1)->moveCount == 1)
&& (*contHist[0])[movedPiece][to_sq(move)] < CounterMovePruneThreshold
@ -1015,20 +1002,38 @@ moves_loop: // When in check, search starts from here
// Futility pruning: parent node (~5 Elo)
if ( lmrDepth < 6
&& !inCheck
&& ss->staticEval + 235 + 172 * lmrDepth <= alpha
&& thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
&& !ss->inCheck
&& ss->staticEval + 284 + 188 * lmrDepth <= alpha
&& (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)] < 25000)
+ (*contHist[3])[movedPiece][to_sq(move)]
+ (*contHist[5])[movedPiece][to_sq(move)] / 2 < 28388)
continue;
// Prune moves with negative SEE (~20 Elo)
if (!pos.see_ge(move, Value(-(32 - std::min(lmrDepth, 18)) * lmrDepth * lmrDepth)))
if (!pos.see_ge(move, Value(-(29 - std::min(lmrDepth, 17)) * lmrDepth * lmrDepth)))
continue;
}
else if (!pos.see_ge(move, Value(-194) * depth)) // (~25 Elo)
else
{
// Capture history based pruning when the move doesn't give check
if ( !givesCheck
&& lmrDepth < 1
&& captureHistory[movedPiece][to_sq(move)][type_of(pos.piece_on(to_sq(move)))] < 0)
continue;
// Futility pruning for captures
if ( !givesCheck
&& lmrDepth < 6
&& !(PvNode && abs(bestValue) < 2)
&& !ss->inCheck
&& ss->staticEval + 267 + 391 * lmrDepth + PieceValue[MG][type_of(pos.piece_on(to_sq(move)))] <= alpha)
continue;
// See based pruning
if (!pos.see_ge(move, Value(-202) * depth)) // (~25 Elo)
continue;
}
}
// Step 14. Extensions (~75 Elo)
@ -1048,16 +1053,16 @@ moves_loop: // When in check, search starts from here
&& tte->depth() >= depth - 3
&& pos.legal(move))
{
Value singularBeta = ttValue - 2 * depth;
Depth halfDepth = depth / 2;
Value singularBeta = ttValue - ((formerPv + 4) * depth) / 2;
Depth singularDepth = (depth - 1 + 3 * formerPv) / 2;
ss->excludedMove = move;
value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, halfDepth, cutNode);
value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, singularDepth, cutNode);
ss->excludedMove = MOVE_NONE;
if (value < singularBeta)
{
extension = 1;
singularLMR = true;
singularQuietLMR = !ttCapture;
}
// Multi-cut pruning
@ -1067,6 +1072,18 @@ moves_loop: // When in check, search starts from here
// a soft bound.
else if (singularBeta >= beta)
return singularBeta;
// If the eval of ttMove is greater than beta we try also if there is an other move that
// pushes it over beta, if so also produce a cutoff
else if (ttValue >= beta)
{
ss->excludedMove = move;
value = search<NonPV>(pos, ss, beta - 1, beta, (depth + 3) / 2, cutNode);
ss->excludedMove = MOVE_NONE;
if (value >= beta)
return beta;
}
}
// Check extension (~2 Elo)
@ -1089,6 +1106,12 @@ moves_loop: // When in check, search starts from here
if (type_of(move) == CASTLING)
extension = 1;
// Late irreversible move extension
if ( move == ttMove
&& pos.rule50_count() > 80
&& (captureOrPromotion || type_of(movedPiece) == PAWN))
extension = 2;
// Add extension to new depth
newDepth += extension;
@ -1104,7 +1127,7 @@ moves_loop: // When in check, search starts from here
// Update the current move (this must be done after singular extension search)
ss->currentMove = move;
ss->continuationHistory = &thisThread->continuationHistory[inCheck]
ss->continuationHistory = &thisThread->continuationHistory[ss->inCheck]
[captureOrPromotion]
[movedPiece]
[to_sq(move)];
@ -1115,18 +1138,18 @@ moves_loop: // When in check, search starts from here
// Step 16. Reduced depth search (LMR, ~200 Elo). If the move fails high it will be
// re-searched at full depth.
if ( depth >= 3
&& moveCount > 1 + rootNode + (rootNode && bestValue < alpha)
&& moveCount > 1 + 2 * rootNode
&& (!rootNode || thisThread->best_move_count(move) == 0)
&& ( !captureOrPromotion
|| moveCountPruning
|| ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha
|| cutNode
|| thisThread->ttHitAverage < 375 * ttHitAverageResolution * ttHitAverageWindow / 1024))
|| thisThread->ttHitAverage < 415 * TtHitAverageResolution * TtHitAverageWindow / 1024))
{
Depth r = reduction(improving, depth, moveCount);
// Decrease reduction if the ttHit running average is large
if (thisThread->ttHitAverage > 500 * ttHitAverageResolution * ttHitAverageWindow / 1024)
if (thisThread->ttHitAverage > 473 * TtHitAverageResolution * TtHitAverageWindow / 1024)
r--;
// Reduction if other threads are searching this position.
@ -1137,13 +1160,16 @@ moves_loop: // When in check, search starts from here
if (ttPv)
r -= 2;
if (moveCountPruning && !formerPv)
r++;
// Decrease reduction if opponent's move count is high (~5 Elo)
if ((ss-1)->moveCount > 14)
if ((ss-1)->moveCount > 13)
r--;
// Decrease reduction if ttMove has been singularly extended (~3 Elo)
if (singularLMR)
r -= 2;
if (singularQuietLMR)
r -= 1 + formerPv;
if (!captureOrPromotion)
{
@ -1160,44 +1186,50 @@ moves_loop: // When in check, search starts from here
// hence break make_move(). (~2 Elo)
else if ( type_of(move) == NORMAL
&& !pos.see_ge(reverse_move(move)))
r -= 2;
r -= 2 + ttPv - (type_of(movedPiece) == PAWN);
ss->statScore = thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)]
- 4926;
// Reset statScore to zero if negative and most stats shows >= 0
if ( ss->statScore < 0
&& (*contHist[0])[movedPiece][to_sq(move)] >= 0
&& (*contHist[1])[movedPiece][to_sq(move)] >= 0
&& thisThread->mainHistory[us][from_to(move)] >= 0)
ss->statScore = 0;
- 4826;
// Decrease/increase reduction by comparing opponent's stat score (~10 Elo)
if (ss->statScore >= -102 && (ss-1)->statScore < -114)
if (ss->statScore >= -100 && (ss-1)->statScore < -112)
r--;
else if ((ss-1)->statScore >= -116 && ss->statScore < -154)
else if ((ss-1)->statScore >= -125 && ss->statScore < -138)
r++;
// Decrease/increase reduction for moves with a good/bad history (~30 Elo)
r -= ss->statScore / 16384;
r -= ss->statScore / 14615;
}
else
{
// Increase reduction for captures/promotions if late move and at low depth
else if (depth < 8 && moveCount > 2)
if (depth < 8 && moveCount > 2)
r++;
Depth d = clamp(newDepth - r, 1, newDepth);
// Unless giving check, this capture is likely bad
if ( !givesCheck
&& ss->staticEval + PieceValue[EG][pos.captured_piece()] + 211 * depth <= alpha)
r++;
}
Depth d = Utility::clamp(newDepth - r, 1, newDepth);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true);
doFullDepthSearch = (value > alpha && d != newDepth), didLMR = true;
doFullDepthSearch = value > alpha && d != newDepth;
didLMR = true;
}
else
doFullDepthSearch = !PvNode || moveCount > 1, didLMR = false;
{
doFullDepthSearch = !PvNode || moveCount > 1;
didLMR = false;
}
// Step 17. Full depth search when LMR is skipped or fails high
if (doFullDepthSearch)
@ -1314,11 +1346,11 @@ moves_loop: // When in check, search starts from here
// must be a mate or a stalemate. If we are in a singular extension search then
// return a fail low score.
assert(moveCount || !inCheck || excludedMove || !MoveList<LEGAL>(pos).size());
assert(moveCount || !ss->inCheck || excludedMove || !MoveList<LEGAL>(pos).size());
if (!moveCount)
bestValue = excludedMove ? alpha
: inCheck ? mated_in(ss->ply) : VALUE_DRAW;
: ss->inCheck ? mated_in(ss->ply) : VALUE_DRAW;
else if (bestMove)
update_all_stats(pos, ss, bestMove, bestValue, beta, prevSq,
@ -1332,7 +1364,7 @@ moves_loop: // When in check, search starts from here
if (PvNode)
bestValue = std::min(bestValue, maxValue);
if (!excludedMove)
if (!excludedMove && !(rootNode && thisThread->pvIdx))
tte->save(posKey, value_to_tt(bestValue, ss->ply), ttPv,
bestValue >= beta ? BOUND_LOWER :
PvNode && bestMove ? BOUND_EXACT : BOUND_UPPER,
@ -1362,7 +1394,7 @@ moves_loop: // When in check, search starts from here
Move ttMove, move, bestMove;
Depth ttDepth;
Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha;
bool ttHit, pvHit, inCheck, givesCheck, captureOrPromotion, evasionPrunable;
bool ttHit, pvHit, givesCheck, captureOrPromotion;
int moveCount;
if (PvNode)
@ -1375,20 +1407,20 @@ moves_loop: // When in check, search starts from here
Thread* thisThread = pos.this_thread();
(ss+1)->ply = ss->ply + 1;
bestMove = MOVE_NONE;
inCheck = pos.checkers();
ss->inCheck = pos.checkers();
moveCount = 0;
// Check for an immediate draw or maximum ply reached
if ( pos.is_draw(ss->ply)
|| ss->ply >= MAX_PLY)
return (ss->ply >= MAX_PLY && !inCheck) ? evaluate(pos) : VALUE_DRAW;
return (ss->ply >= MAX_PLY && !ss->inCheck) ? evaluate(pos) : VALUE_DRAW;
assert(0 <= ss->ply && ss->ply < MAX_PLY);
// Decide whether or not to include checks: this fixes also the type of
// TT entry depth that we are going to use. Note that in qsearch we use
// only two types of depth in TT: DEPTH_QS_CHECKS or DEPTH_QS_NO_CHECKS.
ttDepth = inCheck || depth >= DEPTH_QS_CHECKS ? DEPTH_QS_CHECKS
ttDepth = ss->inCheck || depth >= DEPTH_QS_CHECKS ? DEPTH_QS_CHECKS
: DEPTH_QS_NO_CHECKS;
// Transposition table lookup
posKey = pos.key();
@ -1406,7 +1438,7 @@ moves_loop: // When in check, search starts from here
return ttValue;
// Evaluate the position statically
if (inCheck)
if (ss->inCheck)
{
ss->staticEval = VALUE_NONE;
bestValue = futilityBase = -VALUE_INFINITE;
@ -1427,13 +1459,13 @@ moves_loop: // When in check, search starts from here
else
ss->staticEval = bestValue =
(ss-1)->currentMove != MOVE_NULL ? evaluate(pos)
: -(ss-1)->staticEval + 2 * Eval::Tempo;
: -(ss-1)->staticEval + 2 * Tempo;
// Stand pat. Return immediately if static value is at least beta
if (bestValue >= beta)
{
if (!ttHit)
tte->save(posKey, value_to_tt(bestValue, ss->ply), pvHit, BOUND_LOWER,
tte->save(posKey, value_to_tt(bestValue, ss->ply), false, BOUND_LOWER,
DEPTH_NONE, MOVE_NONE, ss->staticEval);
return bestValue;
@ -1442,7 +1474,7 @@ moves_loop: // When in check, search starts from here
if (PvNode && bestValue > alpha)
alpha = bestValue;
futilityBase = bestValue + 154;
futilityBase = bestValue + 141;
}
const PieceToHistory* contHist[] = { (ss-1)->continuationHistory, (ss-2)->continuationHistory,
@ -1469,7 +1501,7 @@ moves_loop: // When in check, search starts from here
moveCount++;
// Futility pruning
if ( !inCheck
if ( !ss->inCheck
&& !givesCheck
&& futilityBase > -VALUE_KNOWN_WIN
&& !pos.advanced_pawn_push(move))
@ -1491,14 +1523,8 @@ moves_loop: // When in check, search starts from here
}
}
// Detect non-capture evasions that are candidates to be pruned
evasionPrunable = inCheck
&& (depth != 0 || moveCount > 2)
&& bestValue > VALUE_MATED_IN_MAX_PLY
&& !pos.capture(move);
// Don't search moves with negative SEE values
if ( (!inCheck || evasionPrunable) && !pos.see_ge(move))
if ( !ss->inCheck && !pos.see_ge(move))
continue;
// Speculative prefetch as early as possible
@ -1512,7 +1538,7 @@ moves_loop: // When in check, search starts from here
}
ss->currentMove = move;
ss->continuationHistory = &thisThread->continuationHistory[inCheck]
ss->continuationHistory = &thisThread->continuationHistory[ss->inCheck]
[captureOrPromotion]
[pos.moved_piece(move)]
[to_sq(move)];
@ -1546,7 +1572,7 @@ moves_loop: // When in check, search starts from here
// All legal moves have been searched. A special case: If we're in check
// and no legal moves were found, it is checkmate.
if (inCheck && bestValue == -VALUE_INFINITE)
if (ss->inCheck && bestValue == -VALUE_INFINITE)
return mated_in(ss->ply); // Plies to mate from the root
tte->save(posKey, value_to_tt(bestValue, ss->ply), pvHit,
@ -1560,28 +1586,47 @@ moves_loop: // When in check, search starts from here
}
// value_to_tt() adjusts a mate score from "plies to mate from the root" to
// "plies to mate from the current position". Non-mate scores are unchanged.
// value_to_tt() adjusts a mate or TB score from "plies to mate from the root" to
// "plies to mate from the current position". standard scores are unchanged.
// The function is called before storing a value in the transposition table.
Value value_to_tt(Value v, int ply) {
assert(v != VALUE_NONE);
return v >= VALUE_MATE_IN_MAX_PLY ? v + ply
: v <= VALUE_MATED_IN_MAX_PLY ? v - ply : v;
return v >= VALUE_TB_WIN_IN_MAX_PLY ? v + ply
: v <= VALUE_TB_LOSS_IN_MAX_PLY ? v - ply : v;
}
// value_from_tt() is the inverse of value_to_tt(): It adjusts a mate score
// value_from_tt() is the inverse of value_to_tt(): It adjusts a mate or TB score
// from the transposition table (which refers to the plies to mate/be mated
// from current position) to "plies to mate/be mated from the root".
// from current position) to "plies to mate/be mated (TB win/loss) from the root".
// However, for mate scores, to avoid potentially false mate scores related to the 50 moves rule,
// and the graph history interaction, return an optimal TB score instead.
Value value_from_tt(Value v, int ply, int r50c) {
return v == VALUE_NONE ? VALUE_NONE
: v >= VALUE_MATE_IN_MAX_PLY ? VALUE_MATE - v > 99 - r50c ? VALUE_MATE_IN_MAX_PLY : v - ply
: v <= VALUE_MATED_IN_MAX_PLY ? VALUE_MATE + v > 99 - r50c ? VALUE_MATED_IN_MAX_PLY : v + ply : v;
if (v == VALUE_NONE)
return VALUE_NONE;
if (v >= VALUE_TB_WIN_IN_MAX_PLY) // TB win or better
{
if (v >= VALUE_MATE_IN_MAX_PLY && VALUE_MATE - v > 99 - r50c)
return VALUE_MATE_IN_MAX_PLY - 1; // do not return a potentially false mate score
return v - ply;
}
if (v <= VALUE_TB_LOSS_IN_MAX_PLY) // TB loss or worse
{
if (v <= VALUE_MATED_IN_MAX_PLY && VALUE_MATE + v > 99 - r50c)
return VALUE_MATED_IN_MAX_PLY + 1; // do not return a potentially false mate score
return v + ply;
}
return v;
}
@ -1613,7 +1658,7 @@ moves_loop: // When in check, search starts from here
if (!pos.capture_or_promotion(bestMove))
{
update_quiet_stats(pos, ss, bestMove, bonus2);
update_quiet_stats(pos, ss, bestMove, bonus2, depth);
// Decrease all the non-best quiet moves
for (int i = 0; i < quietCount; ++i)
@ -1641,19 +1686,23 @@ moves_loop: // When in check, search starts from here
// update_continuation_histories() updates histories of the move pairs formed
// by moves at ply -1, -2, and -4 with current move.
// by moves at ply -1, -2, -4, and -6 with current move.
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
for (int i : {1, 2, 4, 6})
{
if (ss->inCheck && i > 2)
break;
if (is_ok((ss-i)->currentMove))
(*(ss-i)->continuationHistory)[pc][to] << bonus;
}
}
// update_quiet_stats() updates move sorting heuristics
void update_quiet_stats(const Position& pos, Stack* ss, Move move, int bonus) {
void update_quiet_stats(const Position& pos, Stack* ss, Move move, int bonus, int depth) {
if (ss->killers[0] != move)
{
@ -1674,6 +1723,9 @@ moves_loop: // When in check, search starts from here
Square prevSq = to_sq((ss-1)->currentMove);
thisThread->counterMoves[pos.piece_on(prevSq)][prevSq] = move;
}
if (depth > 11 && ss->ply < MAX_LPH)
thisThread->lowPlyHistory[ss->ply][from_to(move)] << stat_bonus(depth - 6);
}
// When playing with strength handicap, choose best move among a set of RootMoves
@ -1767,7 +1819,7 @@ string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) {
Depth d = updated ? depth : depth - 1;
Value v = updated ? rootMoves[i].score : rootMoves[i].previousScore;
bool tb = TB::RootInTB && abs(v) < VALUE_MATE - MAX_PLY;
bool tb = TB::RootInTB && abs(v) < VALUE_MATE_IN_MAX_PLY;
v = tb ? rootMoves[i].tbScore : v;
if (ss.rdbuf()->in_avail()) // Not at first line

1
DroidFishApp/src/main/cpp/stockfish/search.h
View File

@ -49,6 +49,7 @@ struct Stack {
Value staticEval;
int statScore;
int moveCount;
bool inCheck;
};

45
DroidFishApp/src/main/cpp/stockfish/syzygy/tbprobe.cpp
View File

@ -60,13 +60,12 @@ namespace {
constexpr int TBPIECES = 7; // Max number of supported pieces
enum { BigEndian, LittleEndian };
enum TBType { KEY, WDL, DTZ }; // Used as template parameter
enum TBType { WDL, DTZ }; // Used as template parameter
// Each table has a set of flags: all of them refer to DTZ tables, the last one to WDL tables
enum TBFlag { STM = 1, Mapped = 2, WinPlies = 4, LossPlies = 8, Wide = 16, SingleValue = 128 };
inline WDLScore operator-(WDLScore d) { return WDLScore(-int(d)); }
inline Square operator^=(Square& s, int i) { return s = Square(int(s) ^ i); }
inline Square operator^(Square s, int i) { return Square(int(s) ^ i); }
const std::string PieceToChar = " PNBRQK pnbrqk";
@ -404,7 +403,17 @@ TBTable<DTZ>::TBTable(const TBTable<WDL>& wdl) : TBTable() {
// at init time, accessed at probe time.
class TBTables {
typedef std::tuple<Key, TBTable<WDL>*, TBTable<DTZ>*> Entry;
struct Entry
{
Key key;
TBTable<WDL>* wdl;
TBTable<DTZ>* dtz;
template <TBType Type>
TBTable<Type>* get() const {
return (TBTable<Type>*)(Type == WDL ? (void*)wdl : (void*)dtz);
}
};
static constexpr int Size = 1 << 12; // 4K table, indexed by key's 12 lsb
static constexpr int Overflow = 1; // Number of elements allowed to map to the last bucket
@ -416,12 +425,12 @@ class TBTables {
void insert(Key key, TBTable<WDL>* wdl, TBTable<DTZ>* dtz) {
uint32_t homeBucket = (uint32_t)key & (Size - 1);
Entry entry = std::make_tuple(key, wdl, dtz);
Entry entry{ key, wdl, dtz };
// Ensure last element is empty to avoid overflow when looking up
for (uint32_t bucket = homeBucket; bucket < Size + Overflow - 1; ++bucket) {
Key otherKey = std::get<KEY>(hashTable[bucket]);
if (otherKey == key || !std::get<WDL>(hashTable[bucket])) {
Key otherKey = hashTable[bucket].key;
if (otherKey == key || !hashTable[bucket].get<WDL>()) {
hashTable[bucket] = entry;
return;
}
@ -430,7 +439,7 @@ class TBTables {
// insert here and search for a new spot for the other element instead.
uint32_t otherHomeBucket = (uint32_t)otherKey & (Size - 1);
if (otherHomeBucket > homeBucket) {
swap(entry, hashTable[bucket]);
std::swap(entry, hashTable[bucket]);
key = otherKey;
homeBucket = otherHomeBucket;
}
@ -443,8 +452,8 @@ public:
template<TBType Type>
TBTable<Type>* get(Key key) {
for (const Entry* entry = &hashTable[(uint32_t)key & (Size - 1)]; ; ++entry) {
if (std::get<KEY>(*entry) == key || !std::get<Type>(*entry))
return std::get<Type>(*entry);
if (entry->key == key || !entry->get<Type>())
return entry->get<Type>();
}
}
@ -462,8 +471,6 @@ TBTables TBTables;
// If the corresponding file exists two new objects TBTable<WDL> and TBTable<DTZ>
// are created and added to the lists and hash table. Called at init time.
void TBTables::add(const std::vector<PieceType>& pieces) {
if (sizeof(char*) < 8 && pieces.size() >= 6)
return; // Not enough address space to support 6-men TB on 32-bit OS
std::string code;
@ -523,7 +530,7 @@ int decompress_pairs(PairsData* d, uint64_t idx) {
// I(k) = k * d->span + d->span / 2 (1)
// First step is to get the 'k' of the I(k) nearest to our idx, using definition (1)
uint32_t k = idx / d->span;
uint32_t k = uint32_t(idx / d->span);
// Then we read the corresponding SparseIndex[] entry
uint32_t block = number<uint32_t, LittleEndian>(&d->sparseIndex[k].block);
@ -569,7 +576,7 @@ int decompress_pairs(PairsData* d, uint64_t idx) {
// All the symbols of a given length are consecutive integers (numerical
// sequence property), so we can compute the offset of our symbol of
// length len, stored at the beginning of buf64.
sym = (buf64 - d->base64[len]) >> (64 - len - d->minSymLen);
sym = Sym((buf64 - d->base64[len]) >> (64 - len - d->minSymLen));
// Now add the value of the lowest symbol of length len to get our symbol
sym += number<Sym, LittleEndian>(&d->lowestSym[len]);
@ -708,7 +715,7 @@ Ret do_probe_table(const Position& pos, T* entry, WDLScore wdl, ProbeState* resu
std::swap(squares[0], *std::max_element(squares, squares + leadPawnsCnt, pawns_comp));
tbFile = map_to_queenside(file_of(squares[0]));
tbFile = File(edge_distance(file_of(squares[0])));
}
// DTZ tables are one-sided, i.e. they store positions only for white to
@ -745,7 +752,7 @@ Ret do_probe_table(const Position& pos, T* entry, WDLScore wdl, ProbeState* resu
// the triangle A1-D1-D4.
if (file_of(squares[0]) > FILE_D)
for (int i = 0; i < size; ++i)
squares[i] ^= 7; // Horizontal flip: SQ_H1 -> SQ_A1
squares[i] = flip_file(squares[i]);
// Encode leading pawns starting with the one with minimum MapPawns[] and
// proceeding in ascending order.
@ -764,7 +771,7 @@ Ret do_probe_table(const Position& pos, T* entry, WDLScore wdl, ProbeState* resu
// piece is below RANK_5.
if (rank_of(squares[0]) > RANK_4)
for (int i = 0; i < size; ++i)
squares[i] ^= SQ_A8; // Vertical flip: SQ_A8 -> SQ_A1
squares[i] = flip_rank(squares[i]);
// Look for the first piece of the leading group not on the A1-D4 diagonal
// and ensure it is mapped below the diagonal.
@ -772,7 +779,7 @@ Ret do_probe_table(const Position& pos, T* entry, WDLScore wdl, ProbeState* resu
if (!off_A1H8(squares[i]))
continue;
if (off_A1H8(squares[i]) > 0) // A1-H8 diagonal flip: SQ_A3 -> SQ_C3
if (off_A1H8(squares[i]) > 0) // A1-H8 diagonal flip: SQ_A3 -> SQ_C1
for (int j = i; j < size; ++j)
squares[j] = Square(((squares[j] >> 3) | (squares[j] << 3)) & 63);
break;
@ -977,7 +984,7 @@ uint8_t* set_sizes(PairsData* d, uint8_t* data) {
d->sizeofBlock = 1ULL << *data++;
d->span = 1ULL << *data++;
d->sparseIndexSize = (tbSize + d->span - 1) / d->span; // Round up
d->sparseIndexSize = size_t((tbSize + d->span - 1) / d->span); // Round up
auto padding = number<uint8_t, LittleEndian>(data++);
d->blocksNum = number<uint32_t, LittleEndian>(data); data += sizeof(uint32_t);
d->blockLengthSize = d->blocksNum + padding; // Padded to ensure SparseIndex[]
@ -1346,7 +1353,7 @@ void Tablebases::init(const std::string& paths) {
if (leadPawnsCnt == 1)
{
MapPawns[sq] = availableSquares--;
MapPawns[sq ^ 7] = availableSquares--; // Horizontal flip
MapPawns[flip_file(sq)] = availableSquares--;
}
LeadPawnIdx[leadPawnsCnt][sq] = idx;
idx += Binomial[leadPawnsCnt - 1][MapPawns[sq]];

63
DroidFishApp/src/main/cpp/stockfish/thread.cpp
View File

@ -54,7 +54,7 @@ Thread::~Thread() {
/// Thread::bestMoveCount(Move move) return best move counter for the given root move
int Thread::best_move_count(Move move) {
int Thread::best_move_count(Move move) const {
auto rm = std::find(rootMoves.begin() + pvIdx,
rootMoves.begin() + pvLast, move);
@ -68,17 +68,17 @@ void Thread::clear() {
counterMoves.fill(MOVE_NONE);
mainHistory.fill(0);
lowPlyHistory.fill(0);
captureHistory.fill(0);
for (bool inCheck : { false, true })
for (StatsType c : { NoCaptures, Captures })
{
for (auto& to : continuationHistory[inCheck][c])
for (auto& h : to)
h->fill(0);
for (bool inCheck : { false, true })
for (StatsType c : { NoCaptures, Captures })
continuationHistory[inCheck][c][NO_PIECE][0]->fill(Search::CounterMovePruneThreshold - 1);
}
}
/// Thread::start_searching() wakes up the thread that will start the search
@ -151,7 +151,7 @@ void ThreadPool::set(size_t requested) {
clear();
// Reallocate the hash with the new threadpool size
TT.resize(Options["Hash"]);
TT.resize(size_t(Options["Hash"]));
// Init thread number dependent search params.
Search::init();
@ -166,7 +166,7 @@ void ThreadPool::clear() {
th->clear();
main()->callsCnt = 0;
main()->previousScore = VALUE_INFINITE;
main()->bestPreviousScore = VALUE_INFINITE;
main()->previousTimeReduction = 1.0;
}
@ -208,7 +208,7 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
for (Thread* th : *this)
{
th->nodes = th->tbHits = th->nmpMinPly = 0;
th->nodes = th->tbHits = th->nmpMinPly = th->bestMoveChanges = 0;
th->rootDepth = th->completedDepth = 0;
th->rootMoves = rootMoves;
th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
@ -218,3 +218,52 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
main()->start_searching();
}
Thread* ThreadPool::get_best_thread() const {
Thread* bestThread = front();
std::map<Move, int64_t> votes;
Value minScore = VALUE_NONE;
// Find minimum score of all threads
for (Thread* th: *this)
minScore = std::min(minScore, th->rootMoves[0].score);
// Vote according to score and depth, and select the best thread
for (Thread* th : *this)
{
votes[th->rootMoves[0].pv[0]] +=
(th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
if (abs(bestThread->rootMoves[0].score) >= VALUE_TB_WIN_IN_MAX_PLY)
{
// Make sure we pick the shortest mate / TB conversion or stave off mate the longest
if (th->rootMoves[0].score > bestThread->rootMoves[0].score)
bestThread = th;
}
else if ( th->rootMoves[0].score >= VALUE_TB_WIN_IN_MAX_PLY
|| ( th->rootMoves[0].score > VALUE_TB_LOSS_IN_MAX_PLY
&& votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]]))
bestThread = th;
}
return bestThread;
}
/// Start non-main threads.
void ThreadPool::start_searching() {
for (Thread* th : *this)
if (th != front())
th->start_searching();
}
/// Wait for non-main threads.
void ThreadPool::wait_for_search_finished() const {
for (Thread* th : *this)
if (th != front())
th->wait_for_search_finished();
}

8
DroidFishApp/src/main/cpp/stockfish/thread.h
View File

@ -56,7 +56,7 @@ public:
void idle_loop();
void start_searching();
void wait_for_search_finished();
int best_move_count(Move move);
int best_move_count(Move move) const;
Pawns::Table pawnsTable;
Material::Table materialTable;
@ -71,6 +71,7 @@ public:
Depth rootDepth, completedDepth;
CounterMoveHistory counterMoves;
ButterflyHistory mainHistory;
LowPlyHistory lowPlyHistory;
CapturePieceToHistory captureHistory;
ContinuationHistory continuationHistory[2][2];
Score contempt;
@ -87,7 +88,7 @@ struct MainThread : public Thread {
void check_time();
double previousTimeReduction;
Value previousScore;
Value bestPreviousScore;
Value iterValue[4];
int callsCnt;
bool stopOnPonderhit;
@ -108,6 +109,9 @@ struct ThreadPool : public std::vector<Thread*> {
MainThread* main() const { return static_cast<MainThread*>(front()); }
uint64_t nodes_searched() const { return accumulate(&Thread::nodes); }
uint64_t tb_hits() const { return accumulate(&Thread::tbHits); }
Thread* get_best_thread() const;
void start_searching();
void wait_for_search_finished() const;
std::atomic_bool stop, increaseDepth;

116
DroidFishApp/src/main/cpp/stockfish/timeman.cpp
View File

@ -28,66 +28,21 @@
TimeManagement Time; // Our global time management object
namespace {
enum TimeType { OptimumTime, MaxTime };
constexpr int MoveHorizon = 50; // Plan time management at most this many moves ahead
constexpr double MaxRatio = 7.3; // When in trouble, we can step over reserved time with this ratio
constexpr double StealRatio = 0.34; // However we must not steal time from remaining moves over this ratio
// move_importance() is a skew-logistic function based on naive statistical
// analysis of "how many games are still undecided after n half-moves". Game
// is considered "undecided" as long as neither side has >275cp advantage.
// Data was extracted from the CCRL game database with some simple filtering criteria.
double move_importance(int ply) {
constexpr double XScale = 6.85;
constexpr double XShift = 64.5;
constexpr double Skew = 0.171;
return pow((1 + exp((ply - XShift) / XScale)), -Skew) + DBL_MIN; // Ensure non-zero
}
template<TimeType T>
TimePoint remaining(TimePoint myTime, int movesToGo, int ply, TimePoint slowMover) {
constexpr double TMaxRatio = (T == OptimumTime ? 1.0 : MaxRatio);
constexpr double TStealRatio = (T == OptimumTime ? 0.0 : StealRatio);
double moveImportance = (move_importance(ply) * slowMover) / 100.0;
double otherMovesImportance = 0.0;
for (int i = 1; i < movesToGo; ++i)
otherMovesImportance += move_importance(ply + 2 * i);
double ratio1 = (TMaxRatio * moveImportance) / (TMaxRatio * moveImportance + otherMovesImportance);
double ratio2 = (moveImportance + TStealRatio * otherMovesImportance) / (moveImportance + otherMovesImportance);
return TimePoint(myTime * std::min(ratio1, ratio2)); // Intel C++ asks for an explicit cast
}
} // namespace
/// init() is called at the beginning of the search and calculates the allowed
/// thinking time out of the time control and current game ply. We support four
/// different kinds of time controls, passed in 'limits':
///
/// inc == 0 && movestogo == 0 means: x basetime [sudden death!]
/// inc == 0 && movestogo != 0 means: x moves in y minutes
/// inc > 0 && movestogo == 0 means: x basetime + z increment
/// inc > 0 && movestogo != 0 means: x moves in y minutes + z increment
/// init() is called at the beginning of the search and calculates the bounds
/// of time allowed for the current game ply. We currently support:
// 1) x basetime (+z increment)
// 2) x moves in y seconds (+z increment)
void TimeManagement::init(Search::LimitsType& limits, Color us, int ply) {
TimePoint minThinkingTime = Options["Minimum Thinking Time"];
TimePoint moveOverhead = Options["Move Overhead"];
TimePoint slowMover = Options["Slow Mover"];
TimePoint npmsec = Options["nodestime"];
TimePoint hypMyTime;
TimePoint minThinkingTime = TimePoint(Options["Minimum Thinking Time"]);
TimePoint moveOverhead = TimePoint(Options["Move Overhead"]);
TimePoint slowMover = TimePoint(Options["Slow Mover"]);
TimePoint npmsec = TimePoint(Options["nodestime"]);
// opt_scale is a percentage of available time to use for the current move.
// max_scale is a multiplier applied to optimumTime.
double opt_scale, max_scale;
// If we have to play in 'nodes as time' mode, then convert from time
// to nodes, and use resulting values in time management formulas.
@ -105,29 +60,40 @@ void TimeManagement::init(Search::LimitsType& limits, Color us, int ply) {
}
startTime = limits.startTime;
optimumTime = maximumTime = std::max(limits.time[us], minThinkingTime);
const int maxMTG = limits.movestogo ? std::min(limits.movestogo, MoveHorizon) : MoveHorizon;
//Maximum move horizon of 50 moves
int mtg = limits.movestogo ? std::min(limits.movestogo, 50) : 50;
// We calculate optimum time usage for different hypothetical "moves to go" values
// and choose the minimum of calculated search time values. Usually the greatest
// hypMTG gives the minimum values.
for (int hypMTG = 1; hypMTG <= maxMTG; ++hypMTG)
// Make sure timeLeft is > 0 since we may use it as a divisor
TimePoint timeLeft = std::max(TimePoint(1),
limits.time[us] + limits.inc[us] * (mtg - 1) - moveOverhead * (2 + mtg));
// A user may scale time usage by setting UCI option "Slow Mover"
// Default is 100 and changing this value will probably lose elo.
timeLeft = slowMover * timeLeft / 100;
// x basetime (+ z increment)
// If there is a healthy increment, timeLeft can exceed actual available
// game time for the current move, so also cap to 20% of available game time.
if (limits.movestogo == 0)
{
// Calculate thinking time for hypothetical "moves to go"-value
hypMyTime = limits.time[us]
+ limits.inc[us] * (hypMTG - 1)
- moveOverhead * (2 + std::min(hypMTG, 40));
hypMyTime = std::max(hypMyTime, TimePoint(0));
TimePoint t1 = minThinkingTime + remaining<OptimumTime>(hypMyTime, hypMTG, ply, slowMover);
TimePoint t2 = minThinkingTime + remaining<MaxTime >(hypMyTime, hypMTG, ply, slowMover);
optimumTime = std::min(t1, optimumTime);
maximumTime = std::min(t2, maximumTime);
opt_scale = std::min(0.008 + std::pow(ply + 3.0, 0.5) / 250.0,
0.2 * limits.time[us] / double(timeLeft));
max_scale = 4 + std::min(36, ply) / 12.0;
}
// x moves in y seconds (+ z increment)
else
{
opt_scale = std::min((0.8 + ply / 128.0) / mtg,
0.8 * limits.time[us] / double(timeLeft));
max_scale = std::min(6.3, 1.5 + 0.11 * mtg);
}
// Never use more than 80% of the available time for this move
optimumTime = std::max(minThinkingTime, TimePoint(opt_scale * timeLeft));
maximumTime = TimePoint(std::min(0.8 * limits.time[us] - moveOverhead, max_scale * optimumTime));
if (Options["Ponder"])
optimumTime += optimumTime / 4;
}

26
DroidFishApp/src/main/cpp/stockfish/tt.cpp
View File

@ -36,17 +36,17 @@ TranspositionTable TT; // Our global transposition table
void TTEntry::save(Key k, Value v, bool pv, Bound b, Depth d, Move m, Value ev) {
// Preserve any existing move for the same position
if (m || (k >> 48) != key16)
if (m || (uint16_t)k != key16)
move16 = (uint16_t)m;
// Overwrite less valuable entries
if ( (k >> 48) != key16
if ((uint16_t)k != key16
|| d - DEPTH_OFFSET > depth8 - 4
|| b == BOUND_EXACT)
{
assert(d >= DEPTH_OFFSET);
key16 = (uint16_t)(k >> 48);
key16 = (uint16_t)k;
value16 = (int16_t)v;
eval16 = (int16_t)ev;
genBound8 = (uint8_t)(TT.generation8 | uint8_t(pv) << 2 | b);
@ -63,11 +63,10 @@ void TranspositionTable::resize(size_t mbSize) {
Threads.main()->wait_for_search_finished();
aligned_ttmem_free(mem);
clusterCount = mbSize * 1024 * 1024 / sizeof(Cluster);
free(mem);
mem = malloc(clusterCount * sizeof(Cluster) + CacheLineSize - 1);
table = static_cast<Cluster*>(aligned_ttmem_alloc(clusterCount * sizeof(Cluster), mem));
if (!mem)
{
std::cerr << "Failed to allocate " << mbSize
@ -75,7 +74,6 @@ void TranspositionTable::resize(size_t mbSize) {
exit(EXIT_FAILURE);
}
table = (Cluster*)((uintptr_t(mem) + CacheLineSize - 1) & ~(CacheLineSize - 1));
clear();
}
@ -96,8 +94,8 @@ void TranspositionTable::clear() {
WinProcGroup::bindThisThread(idx);
// Each thread will zero its part of the hash table
const size_t stride = clusterCount / Options["Threads"],
start = stride * idx,
const size_t stride = size_t(clusterCount / Options["Threads"]),
start = size_t(stride * idx),
len = idx != Options["Threads"] - 1 ?
stride : clusterCount - start;
@ -105,7 +103,7 @@ void TranspositionTable::clear() {
});
}
for (std::thread& th: threads)
for (std::thread& th : threads)
th.join();
}
@ -119,7 +117,7 @@ void TranspositionTable::clear() {
TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
TTEntry* const tte = first_entry(key);
const uint16_t key16 = key >> 48; // Use the high 16 bits as key inside the cluster
const uint16_t key16 = (uint16_t)key; // Use the low 16 bits as key inside the cluster
for (int i = 0; i < ClusterSize; ++i)
if (!tte[i].key16 || tte[i].key16 == key16)
@ -150,9 +148,9 @@ TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
int TranspositionTable::hashfull() const {
int cnt = 0;
for (int i = 0; i < 1000 / ClusterSize; ++i)
for (int i = 0; i < 1000; ++i)
for (int j = 0; j < ClusterSize; ++j)
cnt += (table[i].entry[j].genBound8 & 0xF8) == generation8;
return cnt * 1000 / (ClusterSize * (1000 / ClusterSize));
return cnt / ClusterSize;
}

21
DroidFishApp/src/main/cpp/stockfish/tt.h
View File

@ -57,36 +57,33 @@ private:
};
/// A TranspositionTable consists of a power of 2 number of clusters and each
/// cluster consists of ClusterSize number of TTEntry. Each non-empty entry
/// contains information of exactly one position. The size of a cluster should
/// divide the size of a cache line size, to ensure that clusters never cross
/// cache lines. This ensures best cache performance, as the cacheline is
/// prefetched, as soon as possible.
/// A TranspositionTable is an array of Cluster, of size clusterCount. Each
/// cluster consists of ClusterSize number of TTEntry. Each non-empty TTEntry
/// contains information on exactly one position. The size of a Cluster should
/// divide the size of a cache line for best performance,
/// as the cacheline is prefetched when possible.
class TranspositionTable {
static constexpr int CacheLineSize = 64;
static constexpr int ClusterSize = 3;
struct Cluster {
TTEntry entry[ClusterSize];
char padding[2]; // Align to a divisor of the cache line size
char padding[2]; // Pad to 32 bytes
};
static_assert(CacheLineSize % sizeof(Cluster) == 0, "Cluster size incorrect");
static_assert(sizeof(Cluster) == 32, "Unexpected Cluster size");
public:
~TranspositionTable() { free(mem); }
~TranspositionTable() { aligned_ttmem_free(mem); }
void new_search() { generation8 += 8; } // Lower 3 bits are used by PV flag and Bound
TTEntry* probe(const Key key, bool& found) const;
int hashfull() const;
void resize(size_t mbSize);
void clear();
// The 32 lowest order bits of the key are used to get the index of the cluster
TTEntry* first_entry(const Key key) const {
return &table[(uint32_t(key) * uint64_t(clusterCount)) >> 32].entry[0];
return &table[mul_hi64(key, clusterCount)].entry[0];
}
private:

146
DroidFishApp/src/main/cpp/stockfish/tune.cpp Normal file
View File

@ -0,0 +1,146 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#include <iostream>
#include <sstream>
#include "types.h"
#include "misc.h"
#include "uci.h"
using std::string;
bool Tune::update_on_last;
const UCI::Option* LastOption = nullptr;
BoolConditions Conditions;
static std::map<std::string, int> TuneResults;
string Tune::next(string& names, bool pop) {
string name;
do {
string token = names.substr(0, names.find(','));
if (pop)
names.erase(0, token.size() + 1);
std::stringstream ws(token);
name += (ws >> token, token); // Remove trailing whitespace
} while ( std::count(name.begin(), name.end(), '(')
- std::count(name.begin(), name.end(), ')'));
return name;
}
static void on_tune(const UCI::Option& o) {
if (!Tune::update_on_last || LastOption == &o)
Tune::read_options();
}
static void make_option(const string& n, int v, const SetRange& r) {
// Do not generate option when there is nothing to tune (ie. min = max)
if (r(v).first == r(v).second)
return;
if (TuneResults.count(n))
v = TuneResults[n];
Options[n] << UCI::Option(v, r(v).first, r(v).second, on_tune);
LastOption = &Options[n];
// Print formatted parameters, ready to be copy-pasted in fishtest
std::cout << n << ","
<< v << ","
<< r(v).first << "," << r(v).second << ","
<< (r(v).second - r(v).first) / 20.0 << ","
<< "0.0020"
<< std::endl;
}
template<> void Tune::Entry<int>::init_option() { make_option(name, value, range); }
template<> void Tune::Entry<int>::read_option() {
if (Options.count(name))
value = int(Options[name]);
}
template<> void Tune::Entry<Value>::init_option() { make_option(name, value, range); }
template<> void Tune::Entry<Value>::read_option() {
if (Options.count(name))
value = Value(int(Options[name]));
}
template<> void Tune::Entry<Score>::init_option() {
make_option("m" + name, mg_value(value), range);
make_option("e" + name, eg_value(value), range);
}
template<> void Tune::Entry<Score>::read_option() {
if (Options.count("m" + name))
value = make_score(int(Options["m" + name]), eg_value(value));
if (Options.count("e" + name))
value = make_score(mg_value(value), int(Options["e" + name]));
}
// Instead of a variable here we have a PostUpdate function: just call it
template<> void Tune::Entry<Tune::PostUpdate>::init_option() {}
template<> void Tune::Entry<Tune::PostUpdate>::read_option() { value(); }
// Set binary conditions according to a probability that depends
// on the corresponding parameter value.
void BoolConditions::set() {
static PRNG rng(now());
static bool startup = true; // To workaround fishtest bench
for (size_t i = 0; i < binary.size(); i++)
binary[i] = !startup && (values[i] + int(rng.rand<unsigned>() % variance) > threshold);
startup = false;
for (size_t i = 0; i < binary.size(); i++)
sync_cout << binary[i] << sync_endl;
}
// Init options with tuning session results instead of default values. Useful to
// get correct bench signature after a tuning session or to test tuned values.
// Just copy fishtest tuning results in a result.txt file and extract the
// values with:
//
// cat results.txt | sed 's/^param: \([^,]*\), best: \([^,]*\).*/ TuneResults["\1"] = int(round(\2));/'
//
// Then paste the output below, as the function body
#include <cmath>
void Tune::read_results() {
/* ...insert your values here... */
}

195
DroidFishApp/src/main/cpp/stockfish/tune.h Normal file
View File

@ -0,0 +1,195 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2017 Marco Costalba, Joona Kiiski, Tord Romstad
Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TUNE_H_INCLUDED
#define TUNE_H_INCLUDED
#include <memory>
#include <string>
#include <type_traits>
#include <vector>
typedef std::pair<int, int> Range; // Option's min-max values
typedef Range (RangeFun) (int);
// Default Range function, to calculate Option's min-max values
inline Range default_range(int v) {
return v > 0 ? Range(0, 2 * v) : Range(2 * v, 0);
}
struct SetRange {
explicit SetRange(RangeFun f) : fun(f) {}
SetRange(int min, int max) : fun(nullptr), range(min, max) {}
Range operator()(int v) const { return fun ? fun(v) : range; }
RangeFun* fun;
Range range;
};
#define SetDefaultRange SetRange(default_range)
/// BoolConditions struct is used to tune boolean conditions in the
/// code by toggling them on/off according to a probability that
/// depends on the value of a tuned integer parameter: for high
/// values of the parameter condition is always disabled, for low
/// values is always enabled, otherwise it is enabled with a given
/// probability that depnends on the parameter under tuning.
struct BoolConditions {
void init(size_t size) { values.resize(size, defaultValue), binary.resize(size, 0); }
void set();
std::vector<int> binary, values;
int defaultValue = 465, variance = 40, threshold = 500;
SetRange range = SetRange(0, 1000);
};
extern BoolConditions Conditions;
inline void set_conditions() { Conditions.set(); }
/// Tune class implements the 'magic' code that makes the setup of a fishtest
/// tuning session as easy as it can be. Mainly you have just to remove const
/// qualifiers from the variables you want to tune and flag them for tuning, so
/// if you have:
///
/// const Score myScore = S(10, 15);
/// const Value myValue[][2] = { { V(100), V(20) }, { V(7), V(78) } };
///
/// If you have a my_post_update() function to run after values have been updated,
/// and a my_range() function to set custom Option's min-max values, then you just
/// remove the 'const' qualifiers and write somewhere below in the file:
///
/// TUNE(SetRange(my_range), myScore, myValue, my_post_update);
///
/// You can also set the range directly, and restore the default at the end
///
/// TUNE(SetRange(-100, 100), myScore, SetDefaultRange);
///
/// In case update function is slow and you have many parameters, you can add:
///
/// UPDATE_ON_LAST();
///
/// And the values update, including post update function call, will be done only
/// once, after the engine receives the last UCI option, that is the one defined
/// and created as the last one, so the GUI should send the options in the same
/// order in which have been defined.
class Tune {
typedef void (PostUpdate) (); // Post-update function
Tune() { read_results(); }
Tune(const Tune&) = delete;
void operator=(const Tune&) = delete;
void read_results();
static Tune& instance() { static Tune t; return t; } // Singleton
// Use polymorphism to accomodate Entry of different types in the same vector
struct EntryBase {
virtual ~EntryBase() = default;
virtual void init_option() = 0;
virtual void read_option() = 0;
};
template<typename T>
struct Entry : public EntryBase {
static_assert(!std::is_const<T>::value, "Parameter cannot be const!");
static_assert( std::is_same<T, int>::value
|| std::is_same<T, Value>::value
|| std::is_same<T, Score>::value
|| std::is_same<T, PostUpdate>::value, "Parameter type not supported!");
Entry(const std::string& n, T& v, const SetRange& r) : name(n), value(v), range(r) {}
void operator=(const Entry&) = delete; // Because 'value' is a reference
void init_option() override;
void read_option() override;
std::string name;
T& value;
SetRange range;
};
// Our facilty to fill the container, each Entry corresponds to a parameter to tune.
// We use variadic templates to deal with an unspecified number of entries, each one
// of a possible different type.
static std::string next(std::string& names, bool pop = true);
int add(const SetRange&, std::string&&) { return 0; }
template<typename T, typename... Args>
int add(const SetRange& range, std::string&& names, T& value, Args&&... args) {
list.push_back(std::unique_ptr<EntryBase>(new Entry<T>(next(names), value, range)));
return add(range, std::move(names), args...);
}
// Template specialization for arrays: recursively handle multi-dimensional arrays
template<typename T, size_t N, typename... Args>
int add(const SetRange& range, std::string&& names, T (&value)[N], Args&&... args) {
for (size_t i = 0; i < N; i++)
add(range, next(names, i == N - 1) + "[" + std::to_string(i) + "]", value[i]);
return add(range, std::move(names), args...);
}
// Template specialization for SetRange
template<typename... Args>
int add(const SetRange&, std::string&& names, SetRange& value, Args&&... args) {
return add(value, (next(names), std::move(names)), args...);
}
// Template specialization for BoolConditions
template<typename... Args>
int add(const SetRange& range, std::string&& names, BoolConditions& cond, Args&&... args) {
for (size_t size = cond.values.size(), i = 0; i < size; i++)
add(cond.range, next(names, i == size - 1) + "_" + std::to_string(i), cond.values[i]);
return add(range, std::move(names), args...);
}
std::vector<std::unique_ptr<EntryBase>> list;
public:
template<typename... Args>
static int add(const std::string& names, Args&&... args) {
return instance().add(SetDefaultRange, names.substr(1, names.size() - 2), args...); // Remove trailing parenthesis
}
static void init() { for (auto& e : instance().list) e->init_option(); read_options(); } // Deferred, due to UCI::Options access
static void read_options() { for (auto& e : instance().list) e->read_option(); }
static bool update_on_last;
};
// Some macro magic :-) we define a dummy int variable that compiler initializes calling Tune::add()
#define STRINGIFY(x) #x
#define UNIQUE2(x, y) x ## y
#define UNIQUE(x, y) UNIQUE2(x, y) // Two indirection levels to expand __LINE__
#define TUNE(...) int UNIQUE(p, __LINE__) = Tune::add(STRINGIFY((__VA_ARGS__)), __VA_ARGS__)
#define UPDATE_ON_LAST() bool UNIQUE(p, __LINE__) = Tune::update_on_last = true
// Some macro to tune toggling of boolean conditions
#define CONDITION(x) (Conditions.binary[__COUNTER__] || (x))
#define TUNE_CONDITIONS() int UNIQUE(c, __LINE__) = (Conditions.init(__COUNTER__), 0); \
TUNE(Conditions, set_conditions)
#endif // #ifndef TUNE_H_INCLUDED

34
DroidFishApp/src/main/cpp/stockfish/types.h
View File

@ -176,14 +176,17 @@ enum Value : int {
VALUE_INFINITE = 32001,
VALUE_NONE = 32002,
VALUE_MATE_IN_MAX_PLY = VALUE_MATE - 2 * MAX_PLY,
VALUE_MATED_IN_MAX_PLY = -VALUE_MATE + 2 * MAX_PLY,
VALUE_TB_WIN_IN_MAX_PLY = VALUE_MATE - 2 * MAX_PLY,
VALUE_TB_LOSS_IN_MAX_PLY = -VALUE_TB_WIN_IN_MAX_PLY,
VALUE_MATE_IN_MAX_PLY = VALUE_MATE - MAX_PLY,
VALUE_MATED_IN_MAX_PLY = -VALUE_MATE_IN_MAX_PLY,
PawnValueMg = 128, PawnValueEg = 213,
PawnValueMg = 124, PawnValueEg = 206,
KnightValueMg = 781, KnightValueEg = 854,
BishopValueMg = 825, BishopValueEg = 915,
RookValueMg = 1276, RookValueEg = 1380,
QueenValueMg = 2538, QueenValueEg = 2682,
Tempo = 28,
MidgameLimit = 15258, EndgameLimit = 3915
};
@ -201,7 +204,12 @@ enum Piece {
PIECE_NB = 16
};
extern Value PieceValue[PHASE_NB][PIECE_NB];
constexpr Value PieceValue[PHASE_NB][PIECE_NB] = {
{ VALUE_ZERO, PawnValueMg, KnightValueMg, BishopValueMg, RookValueMg, QueenValueMg, VALUE_ZERO, VALUE_ZERO,
VALUE_ZERO, PawnValueMg, KnightValueMg, BishopValueMg, RookValueMg, QueenValueMg, VALUE_ZERO, VALUE_ZERO },
{ VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg, VALUE_ZERO, VALUE_ZERO,
VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg, VALUE_ZERO, VALUE_ZERO }
};
typedef int Depth;
@ -212,7 +220,7 @@ enum : int {
DEPTH_QS_RECAPTURES = -5,
DEPTH_NONE = -6,
DEPTH_OFFSET = DEPTH_NONE,
DEPTH_OFFSET = DEPTH_NONE
};
enum Square : int {
@ -343,25 +351,25 @@ inline Score operator*(Score s, int i) {
/// Multiplication of a Score by a boolean
inline Score operator*(Score s, bool b) {
return Score(int(s) * int(b));
return b ? s : SCORE_ZERO;
}
constexpr Color operator~(Color c) {
return Color(c ^ BLACK); // Toggle color
}
constexpr Square operator~(Square s) {
return Square(s ^ SQ_A8); // Vertical flip SQ_A1 -> SQ_A8
constexpr Square flip_rank(Square s) {
return Square(s ^ SQ_A8);
}
constexpr Square flip_file(Square s) {
return Square(s ^ SQ_H1);
}
constexpr Piece operator~(Piece pc) {
return Piece(pc ^ 8); // Swap color of piece B_KNIGHT -> W_KNIGHT
}
inline File map_to_queenside(File f) {
return std::min(f, File(FILE_H - f)); // Map files ABCDEFGH to files ABCDDCBA
}
constexpr CastlingRights operator&(Color c, CastlingRights cr) {
return CastlingRights((c == WHITE ? WHITE_CASTLING : BLACK_CASTLING) & cr);
}
@ -457,3 +465,5 @@ constexpr bool is_ok(Move m) {
}
#endif // #ifndef TYPES_H_INCLUDED
#include "tune.h" // Global visibility to tuning setup

4
DroidFishApp/src/main/cpp/stockfish/uci.cpp
View File

@ -115,7 +115,7 @@ namespace {
limits.startTime = now(); // As early as possible!
while (is >> token)
if (token == "searchmoves")
if (token == "searchmoves") // Needs to be the last command on the line
while (is >> token)
limits.searchmoves.push_back(UCI::to_move(pos, token));
@ -260,7 +260,7 @@ string UCI::value(Value v) {
stringstream ss;
if (abs(v) < VALUE_MATE - MAX_PLY)
if (abs(v) < VALUE_MATE_IN_MAX_PLY)
ss << "cp " << v * 100 / PawnValueEg;
else
ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;

13
DroidFishApp/src/main/cpp/stockfish/ucioption.cpp
View File

@ -38,9 +38,9 @@ namespace UCI {
/// 'On change' actions, triggered by an option's value change
void on_clear_hash(const Option&) { Search::clear(); }
void on_hash_size(const Option& o) { TT.resize(o); }
void on_hash_size(const Option& o) { TT.resize(size_t(o)); }
void on_logger(const Option& o) { start_logger(o); }
void on_threads(const Option& o) { Threads.set(o); }
void on_threads(const Option& o) { Threads.set(size_t(o)); }
void on_tb_path(const Option& o) { Tablebases::init(o); }
@ -56,8 +56,7 @@ bool CaseInsensitiveLess::operator() (const string& s1, const string& s2) const
void init(OptionsMap& o) {
// at most 2^32 clusters.
constexpr int MaxHashMB = Is64Bit ? 131072 : 2048;
constexpr int MaxHashMB = Is64Bit ? 33554432 : 2048;
o["Debug Log File"] << Option("", on_logger);
o["Contempt"] << Option(24, -100, 100);
@ -68,9 +67,9 @@ void init(OptionsMap& o) {
o["Ponder"] << Option(false);
o["MultiPV"] << Option(1, 1, 500);
o["Skill Level"] << Option(20, 0, 20);
o["Move Overhead"] << Option(30, 0, 5000);
o["Minimum Thinking Time"] << Option(20, 0, 5000);
o["Slow Mover"] << Option(84, 10, 1000);
o["Move Overhead"] << Option(10, 0, 5000);
o["Minimum Thinking Time"] << Option( 0, 0, 5000);
o["Slow Mover"] << Option(100, 10, 1000);
o["nodestime"] << Option(0, 0, 10000);
o["UCI_Chess960"] << Option(false);
o["UCI_AnalyseMode"] << Option(false);