2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
5 Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
7 Stockfish is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 Stockfish is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #ifndef PAWNS_H_INCLUDED
22 #define PAWNS_H_INCLUDED
30 /// Pawns::Entry contains various information about a pawn structure. A lookup
31 /// to the pawn hash table (performed by calling the probe function) returns a
32 /// pointer to an Entry object.
36 Score pawn_score(Color c) const { return scores[c]; }
37 Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
38 Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
39 Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
40 int weak_unopposed(Color c) const { return weakUnopposed[c]; }
41 int passed_count() const { return popcount(passedPawns[WHITE] | passedPawns[BLACK]); }
44 Score king_safety(const Position& pos) {
45 return kingSquares[Us] == pos.square<KING>(Us) && castlingRights[Us] == pos.castling_rights(Us)
46 ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos));
50 Score do_king_safety(const Position& pos);
53 void evaluate_shelter(const Position& pos, Square ksq, Score& shelter);
56 Score scores[COLOR_NB];
57 Bitboard passedPawns[COLOR_NB];
58 Bitboard pawnAttacks[COLOR_NB];
59 Bitboard pawnAttacksSpan[COLOR_NB];
60 Square kingSquares[COLOR_NB];
61 Score kingSafety[COLOR_NB];
62 int weakUnopposed[COLOR_NB];
63 int castlingRights[COLOR_NB];
64 int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
67 typedef HashTable<Entry, 16384> Table;
69 Entry* probe(const Position& pos);
73 #endif // #ifndef PAWNS_H_INCLUDED