mirror of
https://github.com/peterosterlund2/droidfish.git
synced 2024-12-11 12:20:54 +01:00
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
|
|
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
|
|
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
|
|
Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, 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 PAWNS_H_INCLUDED
|
|
#define PAWNS_H_INCLUDED
|
|
|
|
#include "misc.h"
|
|
#include "position.h"
|
|
#include "types.h"
|
|
|
|
namespace Pawns {
|
|
|
|
/// Pawns::Entry contains various information about a pawn structure. Currently,
|
|
/// it only includes a middle game and end game pawn structure evaluation, and a
|
|
/// bitboard of passed pawns. We may want to add further information in the future.
|
|
/// A lookup to the pawn hash table (performed by calling the probe function)
|
|
/// returns a pointer to an Entry object.
|
|
|
|
struct Entry {
|
|
|
|
Score pawns_value() const { return value; }
|
|
Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
|
|
Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
|
|
int pawns_on_same_color_squares(Color c, Square s) const { return pawnsOnSquares[c][!!(DarkSquares & s)]; }
|
|
int semiopen(Color c, File f) const { return semiopenFiles[c] & (1 << int(f)); }
|
|
int semiopen_on_side(Color c, File f, bool left) const {
|
|
|
|
return semiopenFiles[c] & (left ? ((1 << int(f)) - 1) : ~((1 << int(f+1)) - 1));
|
|
}
|
|
|
|
template<Color Us>
|
|
Score king_safety(const Position& pos, Square ksq) {
|
|
|
|
return kingSquares[Us] == ksq && castleRights[Us] == pos.can_castle(Us)
|
|
? kingSafety[Us] : update_safety<Us>(pos, ksq);
|
|
}
|
|
|
|
template<Color Us>
|
|
Score update_safety(const Position& pos, Square ksq);
|
|
|
|
template<Color Us>
|
|
Value shelter_storm(const Position& pos, Square ksq);
|
|
|
|
Key key;
|
|
Bitboard passedPawns[COLOR_NB];
|
|
Bitboard pawnAttacks[COLOR_NB];
|
|
Square kingSquares[COLOR_NB];
|
|
int minKPdistance[COLOR_NB];
|
|
int castleRights[COLOR_NB];
|
|
Score value;
|
|
int semiopenFiles[COLOR_NB];
|
|
Score kingSafety[COLOR_NB];
|
|
int pawnsOnSquares[COLOR_NB][COLOR_NB];
|
|
};
|
|
|
|
typedef HashTable<Entry, 16384> Table;
|
|
|
|
Entry* probe(const Position& pos, Table& entries);
|
|
|
|
}
|
|
|
|
#endif // #ifndef PAWNS_H_INCLUDED
|