Object: Completely immobilize your opponent's forces.
 
A Gorgon moves diagonally forward, sliding to an adjacent empty square. A Gorgon may petrify an opponent's piece by jumping over it to a vacant square on the other side. A petrified piece is unable to move and blocks the space it occupies for the remainder of the game. Jumps may be in any of the five nonretreating directions: vertically, diagonally forward, and sideways. Multiple jumps are possible.
 
The top and bottom of the board are considered to be connected, as if forming a tube. A piece leaving one edge will be re-entered at the appropriate space on the other edge.
 
The first player unable to make a move on his turn, loses.