I love how this app has NEVER crashed on me, unlike ichess. Chess is a huge passion of mine and this an app that actually challenges me and warms me up for competitive play.
Creator of App (SUGGESTION):
I would just prefer (as an advanced player), to be able to disable the help lines that spread across the board when you click on a chess piece. I cant click on a chess piece without being distracted by these lines and I feel this part of the app was intended for novices, thus it should have the option to be disabled for veteran players!
InceptSean about Chess Puzzles: World Champions