- else if (Piece == BISHOP && (PseudoAttacks[Piece][pos.king_square(Them)] & s)) {
- const Bitboard between = BetweenBB[s][pos.king_square(Them)] & pos.pieces();
- if (!more_than_one(between))
+
+ // Otherwise give a bonus if we are a bishop and can pin a piece or
+ // can give a discovered check through an x-ray attack.
+ else if ( Piece == BISHOP
+ && (PseudoAttacks[Piece][pos.king_square(Them)] & s)
+ && !more_than_one(BetweenBB[s][pos.king_square(Them)] & pos.pieces()))