Thats the most complete and achieved chess application on iPad , graphically its the best, even the 3D board is playable, which is unique as ar as I know (other programs offering 3D are not nice). Importing annotated games in pgn is possible (it would be perfect being able to see variations like in CBase Chess). The gamecenter works fine but it should be improved and give more options, like ICC for example. I like also the possibility to play rated games and choosing an opening like Sicilian via the opening library.