Dingux-GChess is based upon GNU Chess.

GNU Chess is command line Chess program running on many differents systems such as UNIX, windows or MacOS. It was started in 1986 by Stuart Cracraft, who is continuing to develop it with other coders such as Chua Kong Sian, Lukas Geyer, Simon Waters and David A. Wheeler.

Dingux GChess uses the GNU Chess version v5.07 for the artificial Intelligence. It is a port to Dingux of zx-81’s previous GP2X-Wiz version, with some new graphics by Satya.

http://zx81.zx81.free.fr/serendipity/index.php?/archives/391-Dingux-Chess-Chess-game-for-Dingux-v1.1.0.html