+++ /dev/null
-/*
- Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
-
- Stockfish is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Stockfish is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#if !defined(PAWNS_H_INCLUDED)
-#define PAWNS_H_INCLUDED
-
-#include "misc.h"
-#include "position.h"
-#include "types.h"
-
-const int PawnTableSize = 16384;
-
-/// PawnEntry is a class which contains various information about a pawn
-/// structure. Currently, it only includes a middle game and an end game
-/// pawn structure evaluation, and a bitboard of passed pawns. We may want
-/// to add further information in the future. A lookup to the pawn hash
-/// table (performed by calling the probe method in a PawnTable object)
-/// returns a pointer to a PawnEntry object.
-
-class PawnEntry {
-
- friend struct PawnTable;
-
-public:
- Score pawns_value() const;
- Bitboard pawn_attacks(Color c) const;
- Bitboard passed_pawns(Color c) const;
- int file_is_half_open(Color c, File f) const;
- int has_open_file_to_left(Color c, File f) const;
- int has_open_file_to_right(Color c, File f) const;
-
- template<Color Us>
- Score king_safety(const Position& pos, Square ksq);
-
-private:
- template<Color Us>
- Score update_safety(const Position& pos, Square ksq);
-
- template<Color Us>
- Value shelter_storm(const Position& pos, Square ksq);
-
- Key key;
- Bitboard passedPawns[2];
- Bitboard pawnAttacks[2];
- Square kingSquares[2];
- int castleRights[2];
- Score value;
- int halfOpenFiles[2];
- Score kingSafety[2];
-};
-
-
-/// The PawnTable class represents a pawn hash table. The most important
-/// method is probe, which returns a pointer to a PawnEntry object.
-
-struct PawnTable {
-
- PawnEntry* probe(const Position& pos);
-
- template<Color Us>
- static Score evaluate_pawns(const Position& pos, Bitboard ourPawns,
- Bitboard theirPawns, PawnEntry* e);
-
- HashTable<PawnEntry, PawnTableSize> entries;
-};
-
-
-inline Score PawnEntry::pawns_value() const {
- return value;
-}
-
-inline Bitboard PawnEntry::pawn_attacks(Color c) const {
- return pawnAttacks[c];
-}
-
-inline Bitboard PawnEntry::passed_pawns(Color c) const {
- return passedPawns[c];
-}
-
-inline int PawnEntry::file_is_half_open(Color c, File f) const {
- return halfOpenFiles[c] & (1 << int(f));
-}
-
-inline int PawnEntry::has_open_file_to_left(Color c, File f) const {
- return halfOpenFiles[c] & ((1 << int(f)) - 1);
-}
-
-inline int PawnEntry::has_open_file_to_right(Color c, File f) const {
- return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
-}
-
-template<Color Us>
-inline Score PawnEntry::king_safety(const Position& pos, Square ksq) {
- return kingSquares[Us] == ksq && castleRights[Us] == pos.can_castle(Us)
- ? kingSafety[Us] : update_safety<Us>(pos, ksq);
-}
-
-#endif // !defined(PAWNS_H_INCLUDED)