This is an awesome app, where anyone can learn and enjoy chess, even those of us who are not very good at it. (when you can win every game, it's hard to get frustrated!) Asfun as the game really is, I've encountered a problem in thr standard ranked mode of the game, where I've checkmated the AI, however the app hasn't recognized it, and merely sits frozen doing nothing. If there's a rep who's reading this, I can use some help here.