A shareware game called begin was released in 1984: a tactical starship game with a good AI and fair rules (the computer had no advantage) I've hacked assembly code to make it a multiplayer game, so that folk can challenge each other rather than the AI.
The project is an opengl 3d (3 level) chess game with an ai that plays against the user. It is written is C++ and uses tcl/tk. All of the code is nearly platform independent.