mangue: I am curious why not two dice instead of one? A second die would allow a distribution of faces more equivalent with the number of pieces. I haven't played "Vegas Fun Chess" in a while but it seems on two dice there were 4 faces for pawns, 2 each for Knight, Bishop and Rook and 1 for the King and Queen. There also might have been a "variant with 3 faces for pawns and a wild card that allowed you to move anything. Vegas Fun chess, I think also allowed the king to move freely out of check. The checking player also had a free move to continue his attack after a check. Perhaps the last rule might be difficult to program in?