To play X11 Xconq, just type `xconq'. This will bring up an initial splash screen; click on it and the following setup screens to get a game going.
By default, X11 Xconq opens up windows on the display named in the
environment variable DISPLAY, and connects it with the first side
and player in the game.
You may also set up a game by supplying arguments on the command line, in the traditional Unix style. This is useful when you know exactly how you want to play a game, and don't want to bother going through all the startup screens.