Chess has many interesting variants that plenty of top players are familiar with. We have already covered many decent Shogi and Chess 960 apps for iPhone. Xiangqi 3D lets you try Chinese chess on your mobile device. It comes with 3D pieces and 8 levels of play. You also get over 1000 puzzles to improve your endgame.
Xiangqi 3D comes with animated game pieces for combat on the board. It also has settings for camera control. You can find out more about this app here.