Here the new idea is to link pinned pieces
with king safety.
Passed both STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 10047 W: 1867 L: 1737 D: 6443
And LTC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 10419 W: 1692 L: 1543 D: 7184
bench:
8325087
const int BishopCheck = 2;
const int KnightCheck = 3;
const int BishopCheck = 2;
const int KnightCheck = 3;
+ const int UnsupportedPinnedPiece = 2;
+
// KingDanger[Color][attackUnits] contains the actual king danger weighted
// scores, indexed by color and by a calculated integer number.
Score KingDanger[COLOR_NB][128];
// KingDanger[Color][attackUnits] contains the actual king danger weighted
// scores, indexed by color and by a calculated integer number.
Score KingDanger[COLOR_NB][128];
if (b)
attackUnits += KnightCheck * popcount<Max15>(b);
if (b)
attackUnits += KnightCheck * popcount<Max15>(b);
+ // Penalty for pinned pieces not defended by a pawn
+ if (ei.pinnedPieces[Us] & ~ei.attackedBy[Us][PAWN])
+ attackUnits += UnsupportedPinnedPiece;
+
// To index KingDanger[] attackUnits must be in [0, 99] range
attackUnits = std::min(99, std::max(0, attackUnits));
// To index KingDanger[] attackUnits must be in [0, 99] range
attackUnits = std::min(99, std::max(0, attackUnits));