Robota Softwarehouse were porting GNU Chess over to the iPhone, as a christmas gift to the community.
Release notes:
This game works very much like the XBoard or WinBoard providing a graphical user interface that allows you to move pieces by tapping with your fingers.
The application is not yet perfect and has some limitations. Currently known problems are: - pawn promotion is not handled properly
Please read at the official GNU Chess page for more information about the engine used.