1 /* 2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1 3 Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file) 4 5 Stockfish is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, either version 3 of the License, or 8 (at your option) any later version. 9 10 Stockfish is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef PAWNS_H_INCLUDED 20 #define PAWNS_H_INCLUDED 21 22 #include "misc.h" 23 #include "position.h" 24 #include "types.h" 25 26 namespace Stockfish::Pawns { 27 28 /// Pawns::Entry contains various information about a pawn structure. A lookup 29 /// to the pawn hash table (performed by calling the probe function) returns a 30 /// pointer to an Entry object. 31 32 struct Entry { 33 pawn_scoreEntry34 Score pawn_score(Color c) const { return scores[c]; } pawn_attacksEntry35 Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; } passed_pawnsEntry36 Bitboard passed_pawns(Color c) const { return passedPawns[c]; } pawn_attacks_spanEntry37 Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; } passed_countEntry38 int passed_count() const { return popcount(passedPawns[WHITE] | passedPawns[BLACK]); } blocked_countEntry39 int blocked_count() const { return blockedCount; } 40 41 template<Color Us> king_safetyEntry42 Score king_safety(const Position& pos) { 43 return kingSquares[Us] == pos.square<KING>(Us) && castlingRights[Us] == pos.castling_rights(Us) 44 ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos)); 45 } 46 47 template<Color Us> 48 Score do_king_safety(const Position& pos); 49 50 template<Color Us> 51 Score evaluate_shelter(const Position& pos, Square ksq) const; 52 53 Key key; 54 Score scores[COLOR_NB]; 55 Bitboard passedPawns[COLOR_NB]; 56 Bitboard pawnAttacks[COLOR_NB]; 57 Bitboard pawnAttacksSpan[COLOR_NB]; 58 Square kingSquares[COLOR_NB]; 59 Score kingSafety[COLOR_NB]; 60 int castlingRights[COLOR_NB]; 61 int blockedCount; 62 }; 63 64 typedef HashTable<Entry, 131072> Table; 65 66 Entry* probe(const Position& pos); 67 68 } // namespace Stockfish::Pawns 69 70 #endif // #ifndef PAWNS_H_INCLUDED 71