mirror of
https://github.com/sockspls/badfish
synced 2025-04-30 00:33:09 +00:00
140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
/*
|
|
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
|
|
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
|
|
Copyright (C) 2008-2010 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
|
|
|
|
////
|
|
//// Includes
|
|
////
|
|
|
|
#include "bitboard.h"
|
|
#include "value.h"
|
|
|
|
////
|
|
//// Types
|
|
////
|
|
|
|
/// PawnInfo 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 get_pawn_info method in a PawnInfoTable object)
|
|
/// returns a pointer to a PawnInfo object.
|
|
class Position;
|
|
|
|
class PawnInfo {
|
|
|
|
friend class PawnInfoTable;
|
|
|
|
public:
|
|
PawnInfo() { clear(); }
|
|
|
|
Score pawns_value() const;
|
|
Value kingside_storm_value(Color c) const;
|
|
Value queenside_storm_value(Color c) const;
|
|
Bitboard pawn_attacks(Color c) const;
|
|
Bitboard passed_pawns() 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;
|
|
int get_king_shelter(const Position& pos, Color c, Square ksq);
|
|
|
|
private:
|
|
void clear();
|
|
int updateShelter(const Position& pos, Color c, Square ksq);
|
|
|
|
Key key;
|
|
Bitboard passedPawns;
|
|
Bitboard pawnAttacks[2];
|
|
Square kingSquares[2];
|
|
Score value;
|
|
int16_t ksStormValue[2], qsStormValue[2];
|
|
uint8_t halfOpenFiles[2];
|
|
uint8_t kingShelters[2];
|
|
};
|
|
|
|
/// The PawnInfoTable class represents a pawn hash table. It is basically
|
|
/// just an array of PawnInfo objects and a few methods for accessing these
|
|
/// objects. The most important method is get_pawn_info, which looks up a
|
|
/// position in the table and returns a pointer to a PawnInfo object.
|
|
|
|
class PawnInfoTable {
|
|
|
|
enum SideType { KingSide, QueenSide };
|
|
|
|
public:
|
|
PawnInfoTable(unsigned numOfEntries);
|
|
~PawnInfoTable();
|
|
PawnInfo* get_pawn_info(const Position& pos) const;
|
|
|
|
private:
|
|
template<Color Us>
|
|
Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi) const;
|
|
|
|
template<Color Us, SideType Side>
|
|
int evaluate_pawn_storm(Square s, Rank r, File f, Bitboard theirPawns) const;
|
|
|
|
unsigned size;
|
|
PawnInfo* entries;
|
|
};
|
|
|
|
|
|
////
|
|
//// Inline functions
|
|
////
|
|
|
|
inline Score PawnInfo::pawns_value() const {
|
|
return value;
|
|
}
|
|
|
|
inline Bitboard PawnInfo::passed_pawns() const {
|
|
return passedPawns;
|
|
}
|
|
|
|
inline Bitboard PawnInfo::pawn_attacks(Color c) const {
|
|
return pawnAttacks[c];
|
|
}
|
|
|
|
inline Value PawnInfo::kingside_storm_value(Color c) const {
|
|
return Value(ksStormValue[c]);
|
|
}
|
|
|
|
inline Value PawnInfo::queenside_storm_value(Color c) const {
|
|
return Value(qsStormValue[c]);
|
|
}
|
|
|
|
inline int PawnInfo::file_is_half_open(Color c, File f) const {
|
|
return (halfOpenFiles[c] & (1 << int(f)));
|
|
}
|
|
|
|
inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
|
|
return halfOpenFiles[c] & ((1 << int(f)) - 1);
|
|
}
|
|
|
|
inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
|
|
return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
|
|
}
|
|
|
|
inline int PawnInfo::get_king_shelter(const Position& pos, Color c, Square ksq) {
|
|
return (kingSquares[c] == ksq ? kingShelters[c] : updateShelter(pos, c, ksq));
|
|
}
|
|
|
|
#endif // !defined(PAWNS_H_INCLUDED)
|