/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
- Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "position.h"
#include "types.h"
-namespace Pawns {
+namespace Stockfish::Pawns {
/// Pawns::Entry contains various information about a pawn structure. A lookup
/// to the pawn hash table (performed by calling the probe function) returns a
struct Entry {
- Score pawns_score() const { return score; }
+ Score pawn_score(Color c) const { return scores[c]; }
Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
- int pawn_span(Color c) const { return pawnSpan[c]; }
- int pawn_asymmetry() const { return asymmetry; }
-
- int semiopen_file(Color c, File f) const {
- return semiopenFiles[c] & (1 << f);
- }
-
- int semiopen_side(Color c, File f, bool leftSide) const {
- return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
- }
-
- int pawns_on_same_color_squares(Color c, Square s) const {
- return pawnsOnSquares[c][!!(DarkSquares & s)];
- }
+ int passed_count() const { return popcount(passedPawns[WHITE] | passedPawns[BLACK]); }
+ int blocked_count() const { return blockedCount; }
template<Color Us>
- Score king_safety(const Position& pos, Square ksq) {
- return kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us)
- ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos, ksq));
+ Score king_safety(const Position& pos) {
+ return kingSquares[Us] == pos.square<KING>(Us) && castlingRights[Us] == pos.castling_rights(Us)
+ ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos));
}
template<Color Us>
- Score do_king_safety(const Position& pos, Square ksq);
+ Score do_king_safety(const Position& pos);
template<Color Us>
- Value shelter_storm(const Position& pos, Square ksq);
+ Score evaluate_shelter(const Position& pos, Square ksq) const;
Key key;
- Score score;
+ Score scores[COLOR_NB];
Bitboard passedPawns[COLOR_NB];
Bitboard pawnAttacks[COLOR_NB];
Bitboard pawnAttacksSpan[COLOR_NB];
Square kingSquares[COLOR_NB];
Score kingSafety[COLOR_NB];
int castlingRights[COLOR_NB];
- int semiopenFiles[COLOR_NB];
- int pawnSpan[COLOR_NB];
- int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
- int asymmetry;
+ int blockedCount;
};
-typedef HashTable<Entry, 16384> Table;
+typedef HashTable<Entry, 131072> Table;
-void init();
Entry* probe(const Position& pos);
-} // namespace Pawns
+} // namespace Stockfish::Pawns
#endif // #ifndef PAWNS_H_INCLUDED