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) 2015-2016 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 pawns_score() const { return score; }
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 pawn_span(Color c) const { return pawnSpan[c]; }
41 int pawn_asymmetry() const { return asymmetry; }
43 int semiopen_file(Color c, File f) const {
44 return semiopenFiles[c] & (1 << f);
47 int semiopen_side(Color c, File f, bool leftSide) const {
48 return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
51 int pawns_on_same_color_squares(Color c, Square s) const {
52 return pawnsOnSquares[c][!!(DarkSquares & s)];
56 Score king_safety(const Position& pos, Square ksq) {
57 return kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us)
58 ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos, ksq));
62 Score do_king_safety(const Position& pos, Square ksq);
65 Value shelter_storm(const Position& pos, Square ksq);
69 Bitboard passedPawns[COLOR_NB];
70 Bitboard pawnAttacks[COLOR_NB];
71 Bitboard pawnAttacksSpan[COLOR_NB];
72 Square kingSquares[COLOR_NB];
73 Score kingSafety[COLOR_NB];
74 int castlingRights[COLOR_NB];
75 int semiopenFiles[COLOR_NB];
76 int pawnSpan[COLOR_NB];
77 int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
81 typedef HashTable<Entry, 16384> Table;
84 Entry* probe(const Position& pos);
88 #endif // #ifndef PAWNS_H_INCLUDED