Since I'm the 1st person who has written a review for this app so far, I'm sure that you're actually going to take the time to read what I have to say, unlike all the reviews I've written for other apps (which were popular enough to be getting reviews written every other second) which I'm sure were probably just ignored. But I digress. I have a (sort-of Captain Obvious) suggestion of something you could do to help improve your app. You could search Wikipedia (more thoroughly than you already have) and Google (for websites other than Wikipedia) to find even more versions/variations/styles of chess such as Shogi, Endgame Chess, Parallel Worlds Chess, Suicide Chess, Einstein Chess, Extinction Chess, Gryphon Chess, Mock Chess, Rejection Chess, Take-All, 3-Check Chess, Unirexal Chess, Progressive Chess, Double Chess, Four-way Chess, 'Maharajah and the Sepoys', Pole Chess, and even Chessers... Just a thought...