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| Rev | Author | Line No. | Line |
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| 96 | pmbaty | 1 | /* |
| 2 | Stockfish, a UCI chess playing engine derived from Glaurung 2.1 |
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| 3 | Copyright (C) 2004-2008 Tord Romstad (Glaurung author) |
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| 4 | Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad |
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| 5 | Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad |
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| 6 | |||
| 7 | Stockfish is free software: you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation, either version 3 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |||
| 12 | Stockfish is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |||
| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef PAWNS_H_INCLUDED |
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| 22 | #define PAWNS_H_INCLUDED |
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| 23 | |||
| 24 | #include "misc.h" |
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| 25 | #include "position.h" |
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| 26 | #include "types.h" |
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| 27 | |||
| 28 | namespace Pawns { |
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| 29 | |||
| 30 | /// Pawns::Entry contains various information about a pawn structure. A lookup |
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| 31 | /// to the pawn hash table (performed by calling the probe function) returns a |
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| 32 | /// pointer to an Entry object. |
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| 33 | |||
| 34 | struct Entry { |
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| 35 | |||
| 36 | Score pawns_score() const { return score; } |
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| 37 | Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; } |
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| 38 | Bitboard passed_pawns(Color c) const { return passedPawns[c]; } |
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| 39 | Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; } |
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| 40 | int pawn_asymmetry() const { return asymmetry; } |
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| 154 | pmbaty | 41 | int open_files() const { return openFiles; } |
| 96 | pmbaty | 42 | |
| 43 | int semiopen_file(Color c, File f) const { |
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| 44 | return semiopenFiles[c] & (1 << f); |
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| 45 | } |
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| 46 | |||
| 47 | int semiopen_side(Color c, File f, bool leftSide) const { |
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| 48 | return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1)); |
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| 49 | } |
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| 50 | |||
| 51 | int pawns_on_same_color_squares(Color c, Square s) const { |
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| 52 | return pawnsOnSquares[c][!!(DarkSquares & s)]; |
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| 53 | } |
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| 54 | |||
| 55 | template<Color Us> |
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| 154 | pmbaty | 56 | Score king_safety(const Position& pos, Square ksq) { |
| 96 | pmbaty | 57 | return kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us) |
| 58 | ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos, ksq)); |
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| 59 | } |
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| 60 | |||
| 61 | template<Color Us> |
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| 62 | Score do_king_safety(const Position& pos, Square ksq); |
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| 63 | |||
| 64 | template<Color Us> |
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| 65 | Value shelter_storm(const Position& pos, Square ksq); |
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| 66 | |||
| 67 | Key key; |
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| 68 | Score score; |
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| 69 | Bitboard passedPawns[COLOR_NB]; |
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| 70 | Bitboard pawnAttacks[COLOR_NB]; |
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| 71 | Bitboard pawnAttacksSpan[COLOR_NB]; |
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| 72 | Square kingSquares[COLOR_NB]; |
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| 73 | Score kingSafety[COLOR_NB]; |
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| 74 | int castlingRights[COLOR_NB]; |
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| 75 | int semiopenFiles[COLOR_NB]; |
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| 76 | int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares] |
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| 77 | int asymmetry; |
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| 154 | pmbaty | 78 | int openFiles; |
| 96 | pmbaty | 79 | }; |
| 80 | |||
| 81 | typedef HashTable<Entry, 16384> Table; |
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| 82 | |||
| 83 | void init(); |
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| 84 | Entry* probe(const Position& pos); |
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| 85 | |||
| 86 | } // namespace Pawns |
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| 87 | |||
| 88 | #endif // #ifndef PAWNS_H_INCLUDED |