Bitboard b;
Score score = SCORE_ZERO;
+ // Undefended minors get penalized even if not under attack
+ Bitboard undefended = pos.pieces(Them)
+ & (pos.pieces(BISHOP) | pos.pieces(KNIGHT))
+ & ~ei.attackedBy[Them][0];
+ if (undefended)
+ score += make_score(25, 10) * popcount<Max15>(undefended);
+
// Enemy pieces not defended by a pawn and under our attack
Bitboard weakEnemies = pos.pieces(Them)
& ~ei.attackedBy[Them][PAWN]
& ei.attackedBy[Us][0];
if (!weakEnemies)
- return SCORE_ZERO;
+ return score;
// Add bonus according to type of attacked enemy piece and to the
// type of attacking piece, from knights to queens. Kings are not