iChessPlay app for iPhone and iPad

This is a very popular chess game which originated from China.
This game has the following main features:
- Player can play against the computer by applying artificial intelligence
- Artificial intelligence is applied from two different types of algorithms. In this game temporarily put the Expert 1 and Expert 2
- Allows 2 players to take turns with each other
- Player can use Undo feature to undo to previous steps
- Players can change style chessboard or pieces to suit preferences
- There are many levels to play from easy to difficult