The chess game does not appear to allow you to castle to the left. You can castle right, but not left. The game would also benefit from the ability for both players to agree to a draw or a resignation. (As could all the games on this site.)
I was in a game and it would not allow me to castle to the left, only to the right.
How this will benefit the site and/or other comments:
In chess a fundamental right of each player is the ability to resign or to draw. There are many games where it is lost, but it still might take days to finish.