Castling is special defend move. Castling is move make by King and one of rock. Is only one move when two figures change position. How to do Castling? Look on the diagram below.
Castling is allow only when all of this conditions are hold:
1) No pieces between king and rock!
2) The king is not currently on the check! And fields use to make Castling cant be on the check or finish king position is on check.
