// Accessing hash keys
Key get_key() const;
+ Key get_exclusion_key() const;
Key get_pawn_key() const;
Key get_material_key() const;
// Incremental evaluation
Score value() const;
Value non_pawn_material(Color c) const;
- Phase game_phase() const;
Score pst_delta(Piece piece, Square from, Square to) const;
// Game termination checks
static Key zobMaterial[2][8][16];
static Key zobSideToMove;
static Score PieceSquareTable[16][64];
+ static Key zobExclusion;
};
return st->key;
}
+inline Key Position::get_exclusion_key() const {
+ return st->key ^ zobExclusion;
+}
+
inline Key Position::get_pawn_key() const {
return st->pawnKey;
}
return st->npMaterial[c];
}
-inline Phase Position::game_phase() const {
-
- // Values modified by Joona Kiiski
- static const Value MidgameLimit = Value(15581);
- static const Value EndgameLimit = Value(3998);
-
- Value npm = non_pawn_material(WHITE) + non_pawn_material(BLACK);
-
- if (npm >= MidgameLimit)
- return PHASE_MIDGAME;
- else if(npm <= EndgameLimit)
- return PHASE_ENDGAME;
- else
- return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
-}
-
inline bool Position::move_is_passed_pawn_push(Move m) const {
Color c = side_to_move();