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
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #ifndef PAWNS_H_INCLUDED
21 #define PAWNS_H_INCLUDED
29 /// Pawns::Entry contains various information about a pawn structure. A lookup
30 /// to the pawn hash table (performed by calling the probe function) returns a
31 /// pointer to an Entry object.
35 Score pawns_score() const { return score; }
36 Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
37 Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
38 int pawn_span(Color c) const { return pawnSpan[c]; }
40 int semiopen_file(Color c, File f) const {
41 return semiopenFiles[c] & (1 << f);
44 int semiopen_side(Color c, File f, bool leftSide) const {
45 return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
48 int pawns_on_same_color_squares(Color c, Square s) const {
49 return pawnsOnSquares[c][!!(DarkSquares & s)];
53 Score king_safety(const Position& pos, Square ksq) {
54 return kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us)
55 ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos, ksq));
59 Score do_king_safety(const Position& pos, Square ksq);
62 Value shelter_storm(const Position& pos, Square ksq);
66 Bitboard passedPawns[COLOR_NB];
67 Bitboard pawnAttacks[COLOR_NB];
68 Square kingSquares[COLOR_NB];
69 Score kingSafety[COLOR_NB];
70 int castlingRights[COLOR_NB];
71 int semiopenFiles[COLOR_NB];
72 int pawnSpan[COLOR_NB];
73 int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
76 typedef HashTable<Entry, 16384> Table;
79 Entry* probe(const Position& pos);
83 #endif // #ifndef PAWNS_H_INCLUDED