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Optimize undefended minor check.
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1 changed files with 14 additions and 8 deletions
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@ -167,6 +167,9 @@ namespace {
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// happen in Chess960 games.
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const Score TrappedBishopA1H1Penalty = make_score(100, 100);
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// Penalty for a minor piece that is not defended by anything
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const Score UndefendedMinorPenalty = make_score(25, 10);
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// The SpaceMask[Color] contains the area of the board which is considered
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// by the space evaluation. In the middle game, each side is given a bonus
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// based on how many squares inside this area are safe and available for
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@ -680,16 +683,19 @@ Value do_evaluate(const Position& pos, Value& margin) {
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Score score = SCORE_ZERO;
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// Undefended minors get penalized even if not under attack
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Bitboard undefended = pos.pieces(Them)
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& (pos.pieces(BISHOP) | pos.pieces(KNIGHT))
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& ~ei.attackedBy[Them][0];
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if (undefended)
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score += make_score(25, 10) * popcount<Max15>(undefended);
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const Bitboard undefended = pos.pieces(Them)
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& (pos.pieces(BISHOP) | pos.pieces(KNIGHT))
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& ~ei.attackedBy[Them][0];
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if (undefended) {
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score += UndefendedMinorPenalty;
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if (!single_bit(undefended))
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score += UndefendedMinorPenalty;
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}
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// Enemy pieces not defended by a pawn and under our attack
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Bitboard weakEnemies = pos.pieces(Them)
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& ~ei.attackedBy[Them][PAWN]
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& ei.attackedBy[Us][0];
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const Bitboard weakEnemies = pos.pieces(Them)
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& ~ei.attackedBy[Them][PAWN]
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& ei.attackedBy[Us][0];
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if (!weakEnemies)
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return score;
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