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backgammon.js v0.1 (alpha)

Backgammon via JavaScript

Backgammon.js consists of four modules:

  • Global defaults
  • Game Logic
  • UI (requires jQuery)
  • AI (is not very intelligent)

Global Defaults (main.js)

Includes the namespace, game defaults, and some helper functions

Game Logic (game.js)

The game logic consist of the board state, dice roller, and move generator.

Modules can plug into the engine to listen for a roll, and act accordingly.

AI (brain.js)

The AI operates on a very simple (yet somewhat effective) move ranking. It does not look more than one move ahead, rather it scores each candidate move based on position, and hit, and vulnerability.

UI (board.js, backgammon.css)

The Board is drawn as an HTML table with CSS. One image is used for the felt background texture.

jQuery is required for scaling, animations, and checker drag-drop.

Example AI Tournament

An example AI tournament is provided in example.html. It initializes 12 boards with 24 respective AI's, and begins playing immediately

Positions

When Initializing a game you can specify a starting position in a modified FEN format:

Ported FEN (Forsyth-Edwards Notation)

Outputs a board into a position Ported from https://en.wikipedia.org/wiki/Forsyth-Edwards_Notation The position conists of 5 tokens, separated by a single space. The tokens are outlined as follows:

    1. Piece placement (from white's perspective). Each point is described, starting with 24 and ending with point 1; within each point, the number and color of checkers is described. (white = "W", black = "B". Empty points are denoted by "/".
    1. Active color. "W" means white moves next, "B" means black.
    1. Two digits in hexadecimal format (0 for none, F for 15). The first digit is the number of white checkers on the bar, the second digit is the number of black checkers on the bar.
    1. Full move number: The number of the full move. It starts at 1, and is incremented after blacks move.
    1. Two digits numbered 0 through 6. The first and second are the values rolled for two dice (1 to 6). If a digit is zero, it denotes the die is yet to be rolled.