At the start of a new game, the cube value is shown as 64. This represents a value of 1 . This was done in the real world as the cube has only 6 sides and some players want to allow the cube to go as high as possible. In most games at the expert level, it is rare for the cube value to go past 4.
Playing with the cube (or doubler) is an integral part of modern backgammon and adds a whole new dimension to the complexity and intrigue of the game. Essentially it is a device used to double the stakes or point values. At the beginning of the game, the cube is in the middle of the board and neither player 'owns' the cube. Before a player rolls the dice and after his opponent has finished his play, a player may double or offer the cube to his opponent. If the opponent rejects the offer, the player offering the cube wins the value of the cube before the double. If the opponent accepts the cube, then the opponent retains possession of the cube until the end of the game or until he redoubles. For instance, if the cube is at 2 and you win a gammon (a double game) then your total win for that game is 4 points. Expert Backgammon limits the cube value to a maximum of 512.
When the computer doubles you, the following window will open asking if you accept the double. Simply click on the Yes or No (or BEAVER if selected) button. Rejecting the double (or dropping the cube) will end the game, awarding the point(s) to the computer.
ﾂ
Double
This offers the cube to your opponent. All point values for wins and losses double. This option may also be activated by positioning the cursor on the cube and clicking the mouse. The Computer will display a window telling you of his decision. If he accepts, the game will continue with the cube at a higher value. If he declines, you will be awarded the value of the cube before doubling, and the game will end.
Automatic
This is allowed only during money play. Many players prefer that when the dice numbers match on the first roll of a new game, the cube is automatically doubled and stays in the center of the board. This is simply a random way to increase the stakes.
Jacoby rule
This rule devised by the renowned champion, Oswald Jacoby, is favored by most money players. It states that a player may not win a gammon or backgammon unless the cube has been turned first (is no longer in the center of the board). This keeps the games shorter and generates more "action". This rule is never used in match play.
Beaver
This is another option favored by money players. When one player doubles another, the player receiving the cube may instantly redouble and retain possession of the cube. Usually this is done to show disdain for the supposed superiority of the opponent's position. If the computer frequently Beavers your doubles, then it is safe to assume that you are doubling too early, meaning that your position is not yet strong enough. (See Double.)
Crawford rule
This is a standard rule used in most tournaments. Simply stated, when the leading scorer is within one point of winning the match, the trailing player may not double during the first game that this situation occurs, but may do so in subsequent games. As the leading scorer gets no benefit from winning a doubled game in this position, this rule was established to protect him for one game. Most players agree that this is a fair arrangement.
Cube Messages
Cube messages will be displayed when the computer takes the cube to give it more 'personality'. You may turn these off if you choose.
Style
To make the game more fun and varied, I have added three styles of play when it comes to making cube decisions. If you have played for any length of time, I窶冦 sure that you recognize a fellow player by one of the following descriptions.
Conservative
Wants the opponent to drop the cube. Will offer the double somewhat 窶徑ate窶 to ensure a single win. Gives the opponent free rolls in which to consolidate his position. Is somewhat timid and will drop takeable doubles.
Balanced
Attempts to offer the cube at the precise moment when the situation is definitely in his favor, but there are chances for the opponent to turn it around. He doesn窶冲 care if the enemy takes or drops as takes as he has maximized his winning equity. Will not be intimidated when offered the cube, but neither is he foolhardy.
Aggressive
Basically a gambler. He doubles early and prefers that the opponent take the double as he would like to try for a gammon (double win) or at least play on for higher stakes. He takes cubes that should be declined because he likes the action.
