2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
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.
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.
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/>.
19 #ifndef PAWNS_H_INCLUDED
20 #define PAWNS_H_INCLUDED
26 namespace Stockfish::Pawns {
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.
34 Score pawn_score(Color c) const { return scores[c]; }
35 Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
36 Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
37 Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
38 int passed_count() const { return popcount(passedPawns[WHITE] | passedPawns[BLACK]); }
39 int blocked_count() const { return blockedCount; }
42 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));
48 Score do_king_safety(const Position& pos);
51 Score evaluate_shelter(const Position& pos, Square ksq) const;
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];
64 typedef HashTable<Entry, 131072> Table;
66 Entry* probe(const Position& pos);
68 } // namespace Stockfish::Pawns
70 #endif // #ifndef PAWNS_H_INCLUDED