0
Method:
Here King moves two steps towards Rook, then Rook jumps over the King and stays at the squares next to the King.
Castling Rules:
1. There should be no pieces between King and Rook while Castling.
2. King and Chosen Rook should not be moved before Castling (or in other words, it must be 1st move of King and Chosen Rook while Castling).
3. King should not be in Check while Castling.
4. The travelling or passing squares of King should not be in attack while Castling.
Special Powers Of Castling:
1. It is the only time where King Moves two steps.
2. It is the only time where a piece can jump over another piece other than Knight, and Jumped Piece is Rook.
3. It is the only time where we move two pieces in 1 move.
Notes:
1. Castling occurs only one time in a game for each side.
2. Kingside Castling or Short side Castling (Notation: 0-0).
3. Queenside Castling or Long side Castling (Notation: 0-0-0).
