+ if (!pos.see_ge(move, occupied, Value(-205) * depth))
+ {
+ if (depth < 2 - capture)
+ continue;
+ // Don't prune the move if opponent Queen/Rook is under discovered attack after the exchanges
+ // Don't prune the move if opponent King is under discovered attack after or during the exchanges
+ Bitboard leftEnemies = (pos.pieces(~us, KING, QUEEN, ROOK)) & occupied;
+ Bitboard attacks = 0;
+ occupied |= to_sq(move);
+ while (leftEnemies && !attacks)
+ {
+ Square sq = pop_lsb(leftEnemies);
+ attacks |= pos.attackers_to(sq, occupied) & pos.pieces(us) & occupied;
+ // Don't consider pieces that were already threatened/hanging before SEE exchanges
+ if (attacks && (sq != pos.square<KING>(~us) && (pos.attackers_to(sq, pos.pieces()) & pos.pieces(us))))
+ attacks = 0;
+ }
+ if (!attacks)
+ continue;
+ }