With the Jacoby rule enabled, gammons and backgammons only score when the cube has been turned. Off by default.
With this rule disabled, neither player will be able to view the board, cube, game and match analyses. The on-screen pip-count is also turned off.
Enables or disables the doubling cube.
With this rule disabled, spectators will not be able to view your game.
Enables or disables the hint option, which allows a player to view a possible best move.
The Crawford rule prevents a player from doubling if his opponent is one point away from winning a match. Should the leading player fail to win the Crawford point, i.e. the one point needed to win the match, the doubling cube is then available without restriction in all subsequent games.
Allows a player to undo a partial move. Once the final die has been used though, a move cannot be undone.
This game variation rolls the same dice for both players. Thus the first player to move knows that his opponent will receive the same dice and can plan ahead accordingly.