2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2014 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. Currently,
30 /// it only includes a middlegame and endgame pawn structure evaluation, and a
31 /// bitboard of passed pawns. We may want to add further information in the future.
32 /// A lookup to the pawn hash table (performed by calling the probe function)
33 /// returns a pointer to an Entry object.
37 Score pawns_value() const { return value; }
38 Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
39 Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
40 Bitboard candidate_pawns(Color c) const { return candidatePawns[c]; }
41 int pawns_on_same_color_squares(Color c, Square s) const { return pawnsOnSquares[c][!!(DarkSquares & s)]; }
42 int semiopen(Color c, File f) const { return semiopenFiles[c] & (1 << int(f)); }
43 int semiopen_on_side(Color c, File f, bool left) const {
45 return semiopenFiles[c] & (left ? ((1 << int(f)) - 1) : ~((1 << int(f+1)) - 1));
49 Score king_safety(const Position& pos, Square ksq) {
51 return kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us)
52 ? kingSafety[Us] : update_safety<Us>(pos, ksq);
56 Score update_safety(const Position& pos, Square ksq);
59 Value shelter_storm(const Position& pos, Square ksq);
62 Bitboard passedPawns[COLOR_NB];
63 Bitboard candidatePawns[COLOR_NB];
64 Bitboard pawnAttacks[COLOR_NB];
65 Square kingSquares[COLOR_NB];
66 int minKPdistance[COLOR_NB];
67 int castlingRights[COLOR_NB];
69 int semiopenFiles[COLOR_NB];
70 Score kingSafety[COLOR_NB];
71 int pawnsOnSquares[COLOR_NB][COLOR_NB];
74 typedef HashTable<Entry, 16384> Table;
77 Entry* probe(const Position& pos, Table& entries);
81 #endif // #ifndef PAWNS_H_INCLUDED