/// | only in 64-bit mode. For compiling requires hardware with
/// | popcnt support.
+#include <cctype>
#include <climits>
#include <cstdlib>
typedef uint64_t Key;
typedef uint64_t Bitboard;
-const int MAX_MOVES = 256;
-const int MAX_PLY = 256;
+const int MAX_MOVES = 192;
+const int MAX_PLY = 100;
const int MAX_PLY_PLUS_2 = MAX_PLY + 2;
const Bitboard FileABB = 0x0101010101010101ULL;
ALL_CASTLES = 15
};
+enum CastlingSide {
+ KING_SIDE,
+ QUEEN_SIDE
+};
+
enum ScaleFactor {
SCALE_FACTOR_DRAW = 0,
SCALE_FACTOR_NORMAL = 64,
return make_score(mg_value(s) / i, eg_value(s) / i);
}
+/// Weight score v by score w trying to prevent overflow
+inline Score apply_weight(Score v, Score w) {
+ return make_score((int(mg_value(v)) * mg_value(w)) / 0x100,
+ (int(eg_value(v)) * eg_value(w)) / 0x100);
+}
+
#undef ENABLE_OPERATORS_ON
#undef ENABLE_SAFE_OPERATORS_ON
-const Value PawnValueMidgame = Value(0x0C6);
-const Value PawnValueEndgame = Value(0x102);
-const Value KnightValueMidgame = Value(0x331);
-const Value KnightValueEndgame = Value(0x34E);
-const Value BishopValueMidgame = Value(0x344);
-const Value BishopValueEndgame = Value(0x359);
-const Value RookValueMidgame = Value(0x4F6);
-const Value RookValueEndgame = Value(0x4FE);
-const Value QueenValueMidgame = Value(0x9D9);
-const Value QueenValueEndgame = Value(0x9FE);
+const Value PawnValueMidgame = Value(198);
+const Value PawnValueEndgame = Value(258);
+const Value KnightValueMidgame = Value(817);
+const Value KnightValueEndgame = Value(846);
+const Value BishopValueMidgame = Value(836);
+const Value BishopValueEndgame = Value(857);
+const Value RookValueMidgame = Value(1270);
+const Value RookValueEndgame = Value(1278);
+const Value QueenValueMidgame = Value(2521);
+const Value QueenValueEndgame = Value(2558);
extern const Value PieceValueMidgame[17]; // Indexed by Piece or PieceType
extern const Value PieceValueEndgame[17];
extern int SquareDistance[64][64];
-extern uint8_t BitCount8Bit[256];
inline Color operator~(Color c) {
return Color(c ^ 1);
}
inline Square operator~(Square s) {
- return Square(s ^ 56);
+ return Square(s ^ 56); // Vertical flip SQ_A1 -> SQ_A8
}
inline Value mate_in(int ply) {
return Piece((c << 3) | pt);
}
+inline CastleRight make_castle_right(Color c, CastlingSide s) {
+ return CastleRight((s == KING_SIDE ? WHITE_OO : WHITE_OOO) << c);
+}
+
inline PieceType type_of(Piece p) {
return PieceType(p & 7);
}
return Square((r << 3) | f);
}
-inline bool square_is_ok(Square s) {
+inline bool is_ok(Square s) {
return s >= SQ_A1 && s <= SQ_H8;
}
}
inline Square mirror(Square s) {
- return Square(s ^ 7);
+ return Square(s ^ 7); // Horizontal flip SQ_A1 -> SQ_H1
}
inline Square relative_square(Color c, Square s) {