+ bool castling_is_check(const Position& pos, CastlingSide side) {
+
+ // After castling opponent king is attacked by the castled rook?
+ File rookFile = (side == QUEEN_SIDE ? FILE_D : FILE_F);
+ Color us = pos.side_to_move();
+ Square ksq = pos.king_square(us);
+ Bitboard occ = pos.occupied_squares(), oppKingBB = EmptyBoardBB;
+
+ set_bit(&oppKingBB, pos.king_square(opposite_color(us)));
+ clear_bit(&occ, ksq); // Remove our king from the board
+ Square rsq = make_square(rookFile, square_rank(ksq));
+ return (rook_attacks_bb(rsq, occ) & oppKingBB);
+ }