This is a great French chess game. It's available through add/remove applications, so it's easy to install...

"pouetChess is a 3 dimensional and open source chess game for Linux. It has an embedded Artificial Intelligence so engines such as GNUChess are not even needed."

When it says embedded Artificial Intelligence, it is not joking. Granted, I am not much of a chess player, but even on "Newbie" difficulty pouetChess regularly makes me look like a dufus. It also makes me a better chess player, which is good. Be sure to check it out.

Here's their site: http://pouetchess.sourceforge.net/