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161c6b0)
Add a bonus if a slider is pinning an enemy piece.
Idea from Critter.
After 27443 games at 2"+0.05
Mod vs Orig 5900 - 5518 - 16025 ELO +4 (+- 2.7)
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
ei.attackedBy[Us][Piece] |= b;
ei.attackedBy[Us][Piece] |= b;
if (b & ei.kingRing[Them])
{
ei.kingAttackersCount[Us]++;
if (b & ei.kingRing[Them])
{
ei.kingAttackersCount[Us]++;
ei.kingAdjacentZoneAttacksCount[Us] += popcount<Max15>(bb);
}
ei.kingAdjacentZoneAttacksCount[Us] += popcount<Max15>(bb);
}
mob = (Piece != QUEEN ? popcount<Max15>(b & mobilityArea)
: popcount<Full >(b & mobilityArea));
mobility += MobilityBonus[Piece][mob];
mob = (Piece != QUEEN ? popcount<Max15>(b & mobilityArea)
: popcount<Full >(b & mobilityArea));
mobility += MobilityBonus[Piece][mob];
+ // Add a bonus if a slider is pinning an enemy piece
+ if ( (Piece == BISHOP || Piece == ROOK || Piece == QUEEN)
+ && (PseudoAttacks[Piece][pos.king_square(Them)] & s))
+ {
+ b = BetweenBB[s][pos.king_square(Them)] & pos.occupied_squares();
+
+ assert(b);
+
+ if (!(b & (b - 1)) && (b & pos.pieces(Them)))
+ score += ThreatBonus[Piece][type_of(pos.piece_on(first_1(b)))] / 2;
+ }
+
// Decrease score if we are attacked by an enemy pawn. Remaining part
// of threat evaluation must be done later when we have full attack info.
if (ei.attackedBy[Them][PAWN] & s)
// Decrease score if we are attacked by an enemy pawn. Remaining part
// of threat evaluation must be done later when we have full attack info.
if (ei.attackedBy[Them][PAWN] & s)