2011-11-12 20:44:06 +01:00
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/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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2014-05-31 14:23:03 +02:00
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Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
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2011-11-12 20:44:06 +01:00
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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2012-01-15 02:13:33 +01:00
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#include <cassert>
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2011-11-12 20:44:06 +01:00
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#include "movegen.h"
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2012-01-01 01:52:19 +01:00
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#include "position.h"
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2011-11-12 20:44:06 +01:00
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namespace {
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2014-05-31 14:23:03 +02:00
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template<CastlingRight Cr, bool Checks, bool Chess960>
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ExtMove* generate_castling(const Position& pos, ExtMove* mlist, Color us, const CheckInfo* ci) {
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static const bool KingSide = (Cr == WHITE_OO || Cr == BLACK_OO);
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2011-11-12 20:44:06 +01:00
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2014-05-31 14:23:03 +02:00
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if (pos.castling_impeded(Cr) || !pos.can_castle(Cr))
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2012-01-15 02:13:33 +01:00
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return mlist;
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// After castling, the rook and king final positions are the same in Chess960
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// as they would be in standard chess.
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Square kfrom = pos.king_square(us);
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2014-05-31 14:23:03 +02:00
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Square rfrom = pos.castling_rook_square(Cr);
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Square kto = relative_square(us, KingSide ? SQ_G1 : SQ_C1);
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2012-01-15 02:13:33 +01:00
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Bitboard enemies = pos.pieces(~us);
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2013-05-03 19:03:42 +02:00
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assert(!pos.checkers());
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2012-01-15 02:13:33 +01:00
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2014-05-31 14:23:03 +02:00
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const Square K = Chess960 ? kto > kfrom ? DELTA_W : DELTA_E
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: KingSide ? DELTA_W : DELTA_E;
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2012-09-23 10:13:11 +02:00
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2014-05-31 14:23:03 +02:00
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for (Square s = kto; s != kfrom; s += K)
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2012-09-16 17:16:15 +02:00
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if (pos.attackers_to(s) & enemies)
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2012-01-15 02:13:33 +01:00
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return mlist;
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// Because we generate only legal castling moves we need to verify that
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// when moving the castling rook we do not discover some hidden checker.
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// For instance an enemy queen in SQ_A1 when castling rook is in SQ_B1.
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2013-11-30 20:12:34 +01:00
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if (Chess960 && (attacks_bb<ROOK>(kto, pos.pieces() ^ rfrom) & pos.pieces(~us, ROOK, QUEEN)))
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2012-09-23 10:13:11 +02:00
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return mlist;
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2012-01-15 02:13:33 +01:00
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2014-05-31 14:23:03 +02:00
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Move m = make<CASTLING>(kfrom, rfrom);
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2012-01-15 02:13:33 +01:00
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2014-05-31 14:23:03 +02:00
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if (Checks && !pos.gives_check(m, *ci))
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return mlist;
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(mlist++)->move = m;
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2012-01-15 02:13:33 +01:00
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return mlist;
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}
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2012-09-16 17:16:15 +02:00
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template<GenType Type, Square Delta>
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2013-08-20 20:02:33 +02:00
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inline ExtMove* generate_promotions(ExtMove* mlist, Bitboard pawnsOn7,
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Bitboard target, const CheckInfo* ci) {
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2012-01-15 02:13:33 +01:00
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2013-08-20 20:02:33 +02:00
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Bitboard b = shift_bb<Delta>(pawnsOn7) & target;
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2012-01-15 02:13:33 +01:00
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while (b)
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{
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2012-09-16 17:16:15 +02:00
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Square to = pop_lsb(&b);
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
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2013-08-20 20:02:33 +02:00
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(mlist++)->move = make<PROMOTION>(to - Delta, to, QUEEN);
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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if (Type == QUIETS || Type == EVASIONS || Type == NON_EVASIONS)
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2012-01-15 02:13:33 +01:00
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{
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2013-08-20 20:02:33 +02:00
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(mlist++)->move = make<PROMOTION>(to - Delta, to, ROOK);
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(mlist++)->move = make<PROMOTION>(to - Delta, to, BISHOP);
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(mlist++)->move = make<PROMOTION>(to - Delta, to, KNIGHT);
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2012-01-15 02:13:33 +01:00
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}
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2014-05-31 14:23:03 +02:00
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// Knight promotion is the only promotion that can give a direct check
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// that's not already included in the queen promotion.
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2012-09-16 17:16:15 +02:00
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if (Type == QUIET_CHECKS && (StepAttacksBB[W_KNIGHT][to] & ci->ksq))
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2013-08-20 20:02:33 +02:00
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(mlist++)->move = make<PROMOTION>(to - Delta, to, KNIGHT);
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2012-01-15 02:13:33 +01:00
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else
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2012-09-16 17:16:15 +02:00
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(void)ci; // Silence a warning under MSVC
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2012-01-15 02:13:33 +01:00
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}
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2012-06-04 18:25:51 +02:00
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2012-01-15 02:13:33 +01:00
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return mlist;
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}
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2012-09-16 17:16:15 +02:00
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template<Color Us, GenType Type>
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2013-08-20 20:02:33 +02:00
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ExtMove* generate_pawn_moves(const Position& pos, ExtMove* mlist,
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Bitboard target, const CheckInfo* ci) {
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2012-01-15 02:13:33 +01:00
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2012-06-04 18:25:51 +02:00
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// Compute our parametrized parameters at compile time, named according to
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2012-01-15 02:13:33 +01:00
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// the point of view of white side.
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const Color Them = (Us == WHITE ? BLACK : WHITE);
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2012-06-04 18:25:51 +02:00
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const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
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2012-01-15 02:13:33 +01:00
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const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
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const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
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2013-08-20 20:02:33 +02:00
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const Square Up = (Us == WHITE ? DELTA_N : DELTA_S);
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const Square Right = (Us == WHITE ? DELTA_NE : DELTA_SW);
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const Square Left = (Us == WHITE ? DELTA_NW : DELTA_SE);
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2012-01-15 02:13:33 +01:00
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Bitboard b1, b2, dc1, dc2, emptySquares;
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2012-06-04 18:25:51 +02:00
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Bitboard pawnsOn7 = pos.pieces(Us, PAWN) & TRank7BB;
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Bitboard pawnsNotOn7 = pos.pieces(Us, PAWN) & ~TRank7BB;
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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Bitboard enemies = (Type == EVASIONS ? pos.pieces(Them) & target:
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Type == CAPTURES ? target : pos.pieces(Them));
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2012-01-15 02:13:33 +01:00
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// Single and double pawn pushes, no promotions
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2012-09-16 17:16:15 +02:00
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if (Type != CAPTURES)
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2012-01-15 02:13:33 +01:00
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{
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2012-09-16 17:16:15 +02:00
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emptySquares = (Type == QUIETS || Type == QUIET_CHECKS ? target : ~pos.pieces());
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2012-01-15 02:13:33 +01:00
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2013-08-20 20:02:33 +02:00
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b1 = shift_bb<Up>(pawnsNotOn7) & emptySquares;
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b2 = shift_bb<Up>(b1 & TRank3BB) & emptySquares;
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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if (Type == EVASIONS) // Consider only blocking squares
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2012-01-15 02:13:33 +01:00
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{
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b1 &= target;
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b2 &= target;
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}
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2012-09-16 17:16:15 +02:00
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if (Type == QUIET_CHECKS)
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2012-01-15 02:13:33 +01:00
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{
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2012-09-16 17:16:15 +02:00
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b1 &= pos.attacks_from<PAWN>(ci->ksq, Them);
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b2 &= pos.attacks_from<PAWN>(ci->ksq, Them);
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2012-01-15 02:13:33 +01:00
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// Add pawn pushes which give discovered check. This is possible only
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// if the pawn is not on the same file as the enemy king, because we
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// don't generate captures. Note that a possible discovery check
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2014-05-31 14:23:03 +02:00
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// promotion has been already generated amongst the captures.
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2012-09-16 17:16:15 +02:00
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if (pawnsNotOn7 & ci->dcCandidates)
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2012-01-15 02:13:33 +01:00
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{
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2013-08-20 20:02:33 +02:00
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dc1 = shift_bb<Up>(pawnsNotOn7 & ci->dcCandidates) & emptySquares & ~file_bb(ci->ksq);
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dc2 = shift_bb<Up>(dc1 & TRank3BB) & emptySquares;
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2012-01-15 02:13:33 +01:00
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b1 |= dc1;
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b2 |= dc2;
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}
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}
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2014-05-31 14:23:03 +02:00
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while (b1)
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{
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Square to = pop_lsb(&b1);
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(mlist++)->move = make_move(to - Up, to);
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}
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while (b2)
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{
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Square to = pop_lsb(&b2);
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(mlist++)->move = make_move(to - Up - Up, to);
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}
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2012-01-15 02:13:33 +01:00
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}
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// Promotions and underpromotions
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2012-09-16 17:16:15 +02:00
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if (pawnsOn7 && (Type != EVASIONS || (target & TRank8BB)))
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2012-01-15 02:13:33 +01:00
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{
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2012-09-16 17:16:15 +02:00
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if (Type == CAPTURES)
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2012-06-04 18:25:51 +02:00
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emptySquares = ~pos.pieces();
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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if (Type == EVASIONS)
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2012-01-15 02:13:33 +01:00
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emptySquares &= target;
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2013-08-20 20:02:33 +02:00
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mlist = generate_promotions<Type, Right>(mlist, pawnsOn7, enemies, ci);
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mlist = generate_promotions<Type, Left >(mlist, pawnsOn7, enemies, ci);
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mlist = generate_promotions<Type, Up>(mlist, pawnsOn7, emptySquares, ci);
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2012-01-15 02:13:33 +01:00
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}
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// Standard and en-passant captures
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2012-09-16 17:16:15 +02:00
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if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
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2012-01-15 02:13:33 +01:00
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{
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2013-08-20 20:02:33 +02:00
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b1 = shift_bb<Right>(pawnsNotOn7) & enemies;
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b2 = shift_bb<Left >(pawnsNotOn7) & enemies;
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2012-06-04 18:25:51 +02:00
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2014-05-31 14:23:03 +02:00
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while (b1)
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{
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Square to = pop_lsb(&b1);
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(mlist++)->move = make_move(to - Right, to);
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}
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while (b2)
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{
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Square to = pop_lsb(&b2);
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(mlist++)->move = make_move(to - Left, to);
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}
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2011-11-12 20:44:06 +01:00
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2012-01-15 02:13:33 +01:00
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if (pos.ep_square() != SQ_NONE)
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{
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2012-06-04 18:25:51 +02:00
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assert(rank_of(pos.ep_square()) == relative_rank(Us, RANK_6));
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2012-01-15 02:13:33 +01:00
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// An en passant capture can be an evasion only if the checking piece
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// is the double pushed pawn and so is in the target. Otherwise this
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// is a discovery check and we are forced to do otherwise.
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2013-08-20 20:02:33 +02:00
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if (Type == EVASIONS && !(target & (pos.ep_square() - Up)))
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2012-01-15 02:13:33 +01:00
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return mlist;
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b1 = pawnsNotOn7 & pos.attacks_from<PAWN>(pos.ep_square(), Them);
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2011-11-12 20:44:06 +01:00
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2012-01-15 02:13:33 +01:00
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assert(b1);
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2012-01-01 01:52:19 +01:00
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2012-01-15 02:13:33 +01:00
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while (b1)
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2013-08-20 20:02:33 +02:00
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(mlist++)->move = make<ENPASSANT>(pop_lsb(&b1), pos.ep_square());
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2012-01-15 02:13:33 +01:00
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}
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}
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2012-01-01 01:52:19 +01:00
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2011-11-12 20:44:06 +01:00
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return mlist;
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}
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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template<PieceType Pt, bool Checks> FORCE_INLINE
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2013-08-20 20:02:33 +02:00
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ExtMove* generate_moves(const Position& pos, ExtMove* mlist, Color us,
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Bitboard target, const CheckInfo* ci) {
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2012-09-16 17:16:15 +02:00
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2012-01-01 01:52:19 +01:00
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assert(Pt != KING && Pt != PAWN);
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2011-11-12 20:44:06 +01:00
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2013-08-20 20:02:33 +02:00
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const Square* pl = pos.list<Pt>(us);
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2011-11-12 20:44:06 +01:00
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2012-09-16 17:16:15 +02:00
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for (Square from = *pl; from != SQ_NONE; from = *++pl)
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2011-11-12 20:44:06 +01:00
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{
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2012-09-16 17:16:15 +02:00
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if (Checks)
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{
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2012-06-04 18:25:51 +02:00
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if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN)
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2012-09-16 17:16:15 +02:00
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&& !(PseudoAttacks[Pt][from] & target & ci->checkSq[Pt]))
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2012-06-04 18:25:51 +02:00
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continue;
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2011-11-12 20:44:06 +01:00
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2013-08-20 20:02:33 +02:00
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if (unlikely(ci->dcCandidates) && (ci->dcCandidates & from))
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2012-06-04 18:25:51 +02:00
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continue;
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2012-09-16 17:16:15 +02:00
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}
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2012-01-15 02:13:33 +01:00
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2012-09-16 17:16:15 +02:00
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Bitboard b = pos.attacks_from<Pt>(from) & target;
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if (Checks)
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b &= ci->checkSq[Pt];
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2014-05-31 14:23:03 +02:00
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while (b)
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(mlist++)->move = make_move(from, pop_lsb(&b));
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2012-06-04 18:25:51 +02:00
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}
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2011-11-12 20:44:06 +01:00
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2012-06-04 18:25:51 +02:00
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return mlist;
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2011-11-12 20:44:06 +01:00
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}
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2012-01-15 02:13:33 +01:00
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2013-08-20 20:02:33 +02:00
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template<Color Us, GenType Type> FORCE_INLINE
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ExtMove* generate_all(const Position& pos, ExtMove* mlist, Bitboard target,
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const CheckInfo* ci = NULL) {
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2013-05-03 19:03:42 +02:00
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const bool Checks = Type == QUIET_CHECKS;
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2012-06-04 18:25:51 +02:00
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2013-08-20 20:02:33 +02:00
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mlist = generate_pawn_moves<Us, Type>(pos, mlist, target, ci);
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mlist = generate_moves<KNIGHT, Checks>(pos, mlist, Us, target, ci);
|
|
|
|
mlist = generate_moves<BISHOP, Checks>(pos, mlist, Us, target, ci);
|
|
|
|
mlist = generate_moves< ROOK, Checks>(pos, mlist, Us, target, ci);
|
|
|
|
mlist = generate_moves< QUEEN, Checks>(pos, mlist, Us, target, ci);
|
2012-09-16 17:16:15 +02:00
|
|
|
|
|
|
|
if (Type != QUIET_CHECKS && Type != EVASIONS)
|
2013-05-03 19:03:42 +02:00
|
|
|
{
|
2014-05-31 14:23:03 +02:00
|
|
|
Square ksq = pos.king_square(Us);
|
|
|
|
Bitboard b = pos.attacks_from<KING>(ksq) & target;
|
|
|
|
while (b)
|
|
|
|
(mlist++)->move = make_move(ksq, pop_lsb(&b));
|
2013-05-03 19:03:42 +02:00
|
|
|
}
|
2012-09-16 17:16:15 +02:00
|
|
|
|
2013-08-20 20:02:33 +02:00
|
|
|
if (Type != CAPTURES && Type != EVASIONS && pos.can_castle(Us))
|
2012-09-16 17:16:15 +02:00
|
|
|
{
|
2012-09-23 10:13:11 +02:00
|
|
|
if (pos.is_chess960())
|
|
|
|
{
|
2014-05-31 14:23:03 +02:00
|
|
|
mlist = generate_castling<MakeCastling<Us, KING_SIDE>::right, Checks, true>(pos, mlist, Us, ci);
|
|
|
|
mlist = generate_castling<MakeCastling<Us, QUEEN_SIDE>::right, Checks, true>(pos, mlist, Us, ci);
|
2012-09-23 10:13:11 +02:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2014-05-31 14:23:03 +02:00
|
|
|
mlist = generate_castling<MakeCastling<Us, KING_SIDE>::right, Checks, false>(pos, mlist, Us, ci);
|
|
|
|
mlist = generate_castling<MakeCastling<Us, QUEEN_SIDE>::right, Checks, false>(pos, mlist, Us, ci);
|
2012-09-23 10:13:11 +02:00
|
|
|
}
|
2012-09-16 17:16:15 +02:00
|
|
|
}
|
2012-01-15 02:13:33 +01:00
|
|
|
|
2011-11-12 20:44:06 +01:00
|
|
|
return mlist;
|
|
|
|
}
|
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
|
2012-01-15 02:13:33 +01:00
|
|
|
} // namespace
|
2011-11-12 20:44:06 +01:00
|
|
|
|
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
/// generate<CAPTURES> generates all pseudo-legal captures and queen
|
2011-11-12 20:44:06 +01:00
|
|
|
/// promotions. Returns a pointer to the end of the move list.
|
|
|
|
///
|
2012-09-16 17:16:15 +02:00
|
|
|
/// generate<QUIETS> generates all pseudo-legal non-captures and
|
2011-11-12 20:44:06 +01:00
|
|
|
/// underpromotions. Returns a pointer to the end of the move list.
|
|
|
|
///
|
2012-09-16 17:16:15 +02:00
|
|
|
/// generate<NON_EVASIONS> generates all pseudo-legal captures and
|
2011-11-12 20:44:06 +01:00
|
|
|
/// non-captures. Returns a pointer to the end of the move list.
|
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
template<GenType Type>
|
2013-08-20 20:02:33 +02:00
|
|
|
ExtMove* generate(const Position& pos, ExtMove* mlist) {
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
assert(Type == CAPTURES || Type == QUIETS || Type == NON_EVASIONS);
|
2013-05-03 19:03:42 +02:00
|
|
|
assert(!pos.checkers());
|
2011-11-12 20:44:06 +01:00
|
|
|
|
|
|
|
Color us = pos.side_to_move();
|
2012-01-07 03:07:28 +01:00
|
|
|
|
2013-05-03 19:03:42 +02:00
|
|
|
Bitboard target = Type == CAPTURES ? pos.pieces(~us)
|
|
|
|
: Type == QUIETS ? ~pos.pieces()
|
|
|
|
: Type == NON_EVASIONS ? ~pos.pieces(us) : 0;
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2013-08-20 20:02:33 +02:00
|
|
|
return us == WHITE ? generate_all<WHITE, Type>(pos, mlist, target)
|
|
|
|
: generate_all<BLACK, Type>(pos, mlist, target);
|
2011-11-12 20:44:06 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
// Explicit template instantiations
|
2013-08-20 20:02:33 +02:00
|
|
|
template ExtMove* generate<CAPTURES>(const Position&, ExtMove*);
|
|
|
|
template ExtMove* generate<QUIETS>(const Position&, ExtMove*);
|
|
|
|
template ExtMove* generate<NON_EVASIONS>(const Position&, ExtMove*);
|
2011-11-12 20:44:06 +01:00
|
|
|
|
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
/// generate<QUIET_CHECKS> generates all pseudo-legal non-captures and knight
|
2011-11-12 20:44:06 +01:00
|
|
|
/// underpromotions that give check. Returns a pointer to the end of the move list.
|
|
|
|
template<>
|
2013-08-20 20:02:33 +02:00
|
|
|
ExtMove* generate<QUIET_CHECKS>(const Position& pos, ExtMove* mlist) {
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2013-05-03 19:03:42 +02:00
|
|
|
assert(!pos.checkers());
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2013-08-20 20:02:33 +02:00
|
|
|
Color us = pos.side_to_move();
|
2012-01-15 02:13:33 +01:00
|
|
|
CheckInfo ci(pos);
|
|
|
|
Bitboard dc = ci.dcCandidates;
|
|
|
|
|
|
|
|
while (dc)
|
|
|
|
{
|
2012-09-16 17:16:15 +02:00
|
|
|
Square from = pop_lsb(&dc);
|
2012-01-15 02:13:33 +01:00
|
|
|
PieceType pt = type_of(pos.piece_on(from));
|
|
|
|
|
|
|
|
if (pt == PAWN)
|
2014-05-31 14:23:03 +02:00
|
|
|
continue; // Will be generated together with direct checks
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2012-06-04 18:25:51 +02:00
|
|
|
Bitboard b = pos.attacks_from(Piece(pt), from) & ~pos.pieces();
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2012-01-15 02:13:33 +01:00
|
|
|
if (pt == KING)
|
|
|
|
b &= ~PseudoAttacks[QUEEN][ci.ksq];
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2014-05-31 14:23:03 +02:00
|
|
|
while (b)
|
|
|
|
(mlist++)->move = make_move(from, pop_lsb(&b));
|
2012-01-15 02:13:33 +01:00
|
|
|
}
|
|
|
|
|
2013-08-20 20:02:33 +02:00
|
|
|
return us == WHITE ? generate_all<WHITE, QUIET_CHECKS>(pos, mlist, ~pos.pieces(), &ci)
|
|
|
|
: generate_all<BLACK, QUIET_CHECKS>(pos, mlist, ~pos.pieces(), &ci);
|
2011-11-12 20:44:06 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
/// generate<EVASIONS> generates all pseudo-legal check evasions when the side
|
2012-01-01 01:52:19 +01:00
|
|
|
/// to move is in check. Returns a pointer to the end of the move list.
|
2011-11-12 20:44:06 +01:00
|
|
|
template<>
|
2013-08-20 20:02:33 +02:00
|
|
|
ExtMove* generate<EVASIONS>(const Position& pos, ExtMove* mlist) {
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2013-05-03 19:03:42 +02:00
|
|
|
assert(pos.checkers());
|
2011-11-12 20:44:06 +01:00
|
|
|
|
|
|
|
Color us = pos.side_to_move();
|
2014-05-31 14:23:03 +02:00
|
|
|
Square ksq = pos.king_square(us);
|
2012-01-01 01:52:19 +01:00
|
|
|
Bitboard sliderAttacks = 0;
|
2014-05-31 14:23:03 +02:00
|
|
|
Bitboard sliders = pos.checkers() & ~pos.pieces(KNIGHT, PAWN);
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2014-05-31 14:23:03 +02:00
|
|
|
// Find all the squares attacked by slider checkers. We will remove them from
|
|
|
|
// the king evasions in order to skip known illegal moves, which avoids any
|
|
|
|
// useless legality checks later on.
|
|
|
|
while (sliders)
|
2011-11-12 20:44:06 +01:00
|
|
|
{
|
2014-05-31 14:23:03 +02:00
|
|
|
Square checksq = pop_lsb(&sliders);
|
|
|
|
sliderAttacks |= LineBB[checksq][ksq] ^ checksq;
|
|
|
|
}
|
2011-11-12 20:44:06 +01:00
|
|
|
|
|
|
|
// Generate evasions for king, capture and non capture moves
|
2014-05-31 14:23:03 +02:00
|
|
|
Bitboard b = pos.attacks_from<KING>(ksq) & ~pos.pieces(us) & ~sliderAttacks;
|
|
|
|
while (b)
|
|
|
|
(mlist++)->move = make_move(ksq, pop_lsb(&b));
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2014-05-31 14:23:03 +02:00
|
|
|
if (more_than_one(pos.checkers()))
|
2012-09-16 17:16:15 +02:00
|
|
|
return mlist; // Double check, only a king move can save the day
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
// Generate blocking evasions or captures of the checking piece
|
2014-05-31 14:23:03 +02:00
|
|
|
Square checksq = lsb(pos.checkers());
|
2013-08-20 20:02:33 +02:00
|
|
|
Bitboard target = between_bb(checksq, ksq) | checksq;
|
2012-06-04 18:25:51 +02:00
|
|
|
|
2013-08-20 20:02:33 +02:00
|
|
|
return us == WHITE ? generate_all<WHITE, EVASIONS>(pos, mlist, target)
|
|
|
|
: generate_all<BLACK, EVASIONS>(pos, mlist, target);
|
2011-11-12 20:44:06 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
/// generate<LEGAL> generates all the legal moves in the given position
|
2011-11-12 20:44:06 +01:00
|
|
|
|
|
|
|
template<>
|
2013-08-20 20:02:33 +02:00
|
|
|
ExtMove* generate<LEGAL>(const Position& pos, ExtMove* mlist) {
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2013-08-20 20:02:33 +02:00
|
|
|
ExtMove *end, *cur = mlist;
|
2013-11-30 20:12:34 +01:00
|
|
|
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
|
2012-09-16 17:16:15 +02:00
|
|
|
Square ksq = pos.king_square(pos.side_to_move());
|
|
|
|
|
2013-05-03 19:03:42 +02:00
|
|
|
end = pos.checkers() ? generate<EVASIONS>(pos, mlist)
|
2012-09-16 17:16:15 +02:00
|
|
|
: generate<NON_EVASIONS>(pos, mlist);
|
|
|
|
while (cur != end)
|
|
|
|
if ( (pinned || from_sq(cur->move) == ksq || type_of(cur->move) == ENPASSANT)
|
2013-11-30 20:12:34 +01:00
|
|
|
&& !pos.legal(cur->move, pinned))
|
2012-09-16 17:16:15 +02:00
|
|
|
cur->move = (--end)->move;
|
2011-11-12 20:44:06 +01:00
|
|
|
else
|
2013-11-30 20:12:34 +01:00
|
|
|
++cur;
|
2011-11-12 20:44:06 +01:00
|
|
|
|
2012-09-16 17:16:15 +02:00
|
|
|
return end;
|
2011-11-12 20:44:06 +01:00
|
|
|
}
|