- return bit_is_set(dcCandidates, from) // Discovered check?
- || bit_is_set(piece_attacks<BISHOP>(ksq), to); // Normal check?
+ return (dcCandidates && bit_is_set(dcCandidates, from))
+ || ( direction_between_squares(ksq, to) != DIR_NONE
+ && bit_is_set(piece_attacks<BISHOP>(ksq), to));