Casino game - Backgammon

Introduction
Backgammon is a game played on a board with two players. The board consists of twenty-four triangles called points. The triangles are grouped into four quadrants of six triangles each. The quadrants are defined with english names. These are: Home board, Outer board and those of the opponent. Between the home board and outer board there is a line that's called the "bar". The points are 1 to 24, starting from the beginning of the board of the player. So the first point of player 1 is the 24th point of player 2. When the game starts each player has 15 checkers on the board, 5 checkers on point 13, 2 checkers on point 24, 3 on point 8 and 5 on point 6.

Purpose
The purpose of backgammon is to get all of your checkers off the board first. First you need to get the checkers on your own board, then they can be removed.

Moving the checkers
The players may throw the dice one at a time. When the dice are thrown, the player may move his checkers according to the amount shown on the dice (See image 1).

Moving the checkers is done as followed:
- A checker may only be moved to an open point. This point can not have two or more of the opponents checkers .
- The amount shown on the dice constitutes separate moves. For example, when a player throws a 2 and 4, the player can move one checker 6 times. This is only allowed when when one of the two points are still free (two or four points from it's starting position).
- When a player throws doubles, he may move the checkers twice according to the amount shown on the dice. When a player throws a 4 twice, he gets four 4's.
- A player must use both numbers of a roll if this is legally possible. When only one number can be played, the player must play that number. Or if either number can be played but not both, the player must play the highest number. In the case of doubles, the player must play as many numbers as he can where possible.

Image 1

Hitting and entering
When a checker is moved to a point where there is exactly one of the opponents checkers, this one will be removed and placed on the bar. We call this "blot". Any time a player has one or more checkers on the bar, his first obligation is to enter those checkers into the opposing home board. This is done by moving the checker to an open point corresponding to one of the numbers on the rolled dice. If there are no open points corresponding with the number on the dice, the player loses his turn. Any unused numbers on the dice that are left over can be played.

Bearing off
When a player has moved all of his fifteen checkers onto his home board, he may commence bearing off. A player bears off a checker by rolling a number that corresponds with the point on which the checker resides, and then removing that checker from the board. So when a player throws a 3 he can remove a checker from point 5 from the board. If there is no checker on this point the player must make a legal move using a checker on a higher-numbered point. When there are no checkers on higher-numbered points, the player has to remove a checker from the highest point on which one of his checkers resides. When a checker is hit during the bear-off process, the player must bring that checker back to his home board before continuing to bear off.

Doubling
There is a dice on the bar. This dice has the numbers 1, 2, 3, 4, 8, 16 and 32 on it's faces. When you start, the dice has the number 1 on top, placed in the middle of the bar. Both playes can play doubling with this dice. Doubling is only allowed at the start of your turn, before you have thrown a dice. When doubling, the opponent can choose if he accepts or refuses this. When a player refuses this you have won. If he does, the dice is placed on the opponents side with the number 2 faced up. Only the player on this side can make the next double. After each successful double the points are doubled and are placed next to the other player.

Backgammons & Gammons
The player who has removed all of his checkers from the board first wins, he wins the value shown on the doubling cube.If a player didn't get to remove a checker from the board we call this gammon and the winner will get twice the value shown on the dice. If the loser didn't get any checkers on his home board, we call this backgammon and the winner will get three times worth the value of the dice.

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