The rules of the game are very simple: Each player has one pawn and a 6×8 grid. Each turn a player will move his or her pawn in one direction to any (still existing) square and then punch out any remaining square. As long as you are still able to move your piece on your turn then you are in the game. If you can’t you are “isolated” and lose the game.

http://www.atariage.com/forums/topic/159077-2600-homebrew-game-isolate/