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### 2.1 Setup

Backgammon is a game for two players, played on a board consisting of twenty-four narrow triangles called points. The triangles alternate in color and are grouped into four quadrants of six triangles each. The quadrants are referred to as a player's home board and outer board, and the opponent's home board and outer board. The home and the outer boards are separated from each other by a ridge down the center of the board called the bar.

A board with the checkers in their initial position.

```
Outer Board           O's Home Board
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X           O    |   | O              X |
| X           O    |   | O              X |
| X           O    |   | O                |
| X                |   | O                |
| X                |   | O                |
|                  |BAR|                  |
| O                |   | X                |
| O                |   | X                |
| O           X    |   | X                |
| O           X    |   | X              O |
| O           X    |   | X              O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Outer Board           X's Home Board

```

An alternate arrangement is the reverse of the one shown here, with the home board on the left and the outer board on the right.

The points are numbered for either player starting in that player's home board. The outermost point is the twenty-four point, which is also the opponent's one point. Each player has fifteen checkers of his own color. The initial arrangement of checkers is: two on each player's twenty-four point, five on each player's thirteen point, three on each player's eight point, and five on each player's six point.

Both players have their own pair of dice and a dice cup used for shaking. A double cube, with the numerals 2, 4, 8, 16, 32, and 64 on its faces, is used to keep track of the current stake of the game.