Backgammon doubling
The game begins with a value of one point. The doubling cube, with the numbers 2, 4, 8, 16, 32, and 64 on its faces, is used for keeping track of the increase in units or points, for which the game is being played.
At the beginning, the doubling cube is in between the two players with 64 facing up. This means that the game is being played for one point. If one player think he has gained an advantage during the game, he may double the stakes by turning the cube to 2 and offering it to his opponent. This is done before the player rolls the dice for his turn (even if the player is "closed-out" he can still double) His opponent then has a choice: He can refuse the double (or pass), thus conceding the game and losing one point; or he can accept the double (take), take possession of the doubling cube, and continue playing the game for two points. A player who accepts a double owns the cube and is then the only person in a position to re-double the stakes.
The game can be doubled and re-doubled any number of times.
At the end of the game, the score the winner gets is the multiplication of the douling cube value and the winning type (1 for real winning, 2 for gammon, 3 for backgammon)
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