Chess_Club app for iPhone and iPad
A popular asian chess game, using Game Center to play with friends or others for fun. It comes with integrated evaluation games for the fun of checking on a players skill level, and sort of exhibiting the details of the game.
Each player can optionally claim winning if the opponent failed to move within 30 seconds; or, negotiate for a new game. The winning scores and skill levels can be posted to the game center leaderboards if a player choose to.