71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
|
|
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
|
|
Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
|
|
|
|
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 Stockfish::Pawns {
|
|
|
|
/// Pawns::Entry contains various information about a pawn structure. A lookup
|
|
/// to the pawn hash table (performed by calling the probe function) returns a
|
|
/// pointer to an Entry object.
|
|
|
|
struct Entry {
|
|
|
|
Score pawn_score(Color c) const { return scores[c]; }
|
|
Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
|
|
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) {
|
|
return kingSquares[Us] == pos.square<KING>(Us) && castlingRights[Us] == pos.castling_rights(Us)
|
|
? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos));
|
|
}
|
|
|
|
template<Color Us>
|
|
Score do_king_safety(const Position& pos);
|
|
|
|
template<Color Us>
|
|
Score evaluate_shelter(const Position& pos, Square ksq) const;
|
|
|
|
Key key;
|
|
Score scores[COLOR_NB];
|
|
Bitboard passedPawns[COLOR_NB];
|
|
Bitboard pawnAttacks[COLOR_NB];
|
|
Bitboard pawnAttacksSpan[COLOR_NB];
|
|
Square kingSquares[COLOR_NB];
|
|
Score kingSafety[COLOR_NB];
|
|
int castlingRights[COLOR_NB];
|
|
int blockedCount;
|
|
};
|
|
|
|
typedef HashTable<Entry, 131072> Table;
|
|
|
|
Entry* probe(const Position& pos);
|
|
|
|
} // namespace Stockfish::Pawns
|
|
|
|
#endif // #ifndef PAWNS_H_INCLUDED
|