Changes

For chess, players make a castling move by moving their Kings to two cells, left or right. However, for Chess960 sometimes they can’t move their King to two cells since the target cell maybe may be still occupied by a pieceand/or the distance between King and the target cell may range from 1 to 6 (differ from 2 cells). Many chess GUIs solved that difficulty/ambiguity by changing the way to make castling move: move the King to capture its own Rooks.