* You can choose from 20 levels of difficulty.* You can have AI play against each other.* You can change players or difficulty during the game.* You can have a folding machine.* You can continue the stopped game because the app is closed.* Notation can be saved and restored.Some of the artificial intelligence of this app is a modification of the Chinese long-term AI engine at http://sourceforge.net/projects/xqwizard/, and the source code after the modification is at http://blog.naver.com/ohjsn .