The program, tells you when one side has lost, but allows you to continue playing anyway so that you can try out different steps. Until I rectify it, treat it as a feature.

Rules:

• It is played on a standard 18x18 Go board with a "twilight zone" on either side making it a 20x20 board (a--t, 1--20 where columns a and t and rows 1 and 20 cannot be occupied by stones).
• Each player has 43 stones. Red goes first.
• A piece is defined by a 3x3 region not containing your opponents stones and with at least one of your stone being along the periphery.

  Rook	Bishop	Queen	Ring	Pawn	Hybrid1	Hybrid2	Hybrid3	Hybrid4	Partly twilight

• If the middle square of you 3x3 piece is occupied, the piece can move until obstructed. Otherwise it can move at most three steps.
• If obstructed, the piece stops there. Stones which were there earlier go out.
• One can remove ones own stones in the above fashion.
• The "twilight zone" can be used as part of a 3x3 piece. But any stone that goes on to it vanishes off the board.
• Each player has a ring to begin with: a 3x3 piece with the center empty. You lose when you lose your ring. You can accumulate more rings during the play.

Enjoy the game!