Score score = SCORE_ZERO;
// Undefended minors get penalized even if not under attack
- const Bitboard undefended = pos.pieces(Them)
- & (pos.pieces(BISHOP) | pos.pieces(KNIGHT))
- & ~ei.attackedBy[Them][0];
- if (undefended) {
- score += UndefendedMinorPenalty;
- if (!single_bit(undefended))
- score += UndefendedMinorPenalty;
- }
+ Bitboard undefended = pos.pieces(Them)
+ & (pos.pieces(BISHOP) | pos.pieces(KNIGHT))
+ & ~ei.attackedBy[Them][0];
+ if (undefended)
+ score += single_bit(undefended) ? UndefendedMinorPenalty
+ : UndefendedMinorPenalty * 2;
// Enemy pieces not defended by a pawn and under our attack
- const Bitboard weakEnemies = pos.pieces(Them)
- & ~ei.attackedBy[Them][PAWN]
- & ei.attackedBy[Us][0];
+ Bitboard weakEnemies = pos.pieces(Them)
+ & ~ei.attackedBy[Them][PAWN]
+ & ei.attackedBy[Us][0];
if (!weakEnemies)
return score;