This is gnome-chess, a graphical user interface for playing chess.

It works with chess programs and chess servers - it is also a PGN viewer.
For chess programs, it works best with the chess engine crafty 
(ftp://ftp.cis.uab.edu/pub/hyatt) but most features should also work with
GNU Chess (ftp://ftp.gnu.org).

You can use the "first chess program" option to choose the computer engine
you want to play against.  

E.g. try "gnome-chess --fcp crafty" or "gnome-chess --fcp gnuchessx"

You can use the --ics* options to choose the server and pick user name and
passwords.

E.g. try "gnome-chess --ics --icshost freechess.org"
