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 may be still occupied by a piece and/or the distance between the King and the target cell may range vary from 1 to 6 (differ from not only 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.