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Bring back just bishop pins

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Gary Linscott
2013-01-26 15:35:00 -05:00
parent 7062db7cb2
commit 57797822f8
1 changed files with 6 additions and 0 deletions
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6
src/evaluate.cpp
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@@ -577,6 +577,12 @@ Value do_evaluate(const Position& pos, Value& margin) {
mobility += MobilityBonus[Piece][mob]; mobility += MobilityBonus[Piece][mob];
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))
score += make_score(25, 25);
}
// Decrease score if we are attacked by an enemy pawn. Remaining part // 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. // of threat evaluation must be done later when we have full attack info.
if (ei.attackedBy[Them][PAWN] & s) if (ei.attackedBy[Them][PAWN] & s)