Good representation of chess. Works well with no glitches so far. Only played computer so far. Some challenges are wrong. The so called chess mate the app is looking for is not check mate because the piece threatening King can be taken by another piece. It also sometimes calls stalemate when it clearly isn't. I was playing computer to work on my end game. Computer had only King left, I had most of my pieces, it called stalemate. Come on, please check your programming logic.