THE SMART TRICK OF CHESS BOARD THAT NO ONE IS DISCUSSING

Castling can be done only when there won't be any pieces in between the king plus the rook you are going to go. The king and rook simply cannot have moved Earlier. You cannot castle if your king is in check or if doing this would move your king as a result of or into a square in which he could well be in Check out. Thanks! We are happy this was ben