🎲 Vanilla JS Tric-Trac

Vanilla JS implementation of the Backgammon variation Tric-Trac.

Rules

• The game has two players: white and black.
• Each player has 15 checker.
• The board is a regular backgammon board.
• All checkers are initially placed outside board.
• The game uses two dice.
• The lower number of the dice must be plaied first.
• If the lower number of the dice cannot be played, the turn switches.
• If a player rolls a double (e.g. 1 + 1), the number is played four times (e.g. 4 * 1).
• If a player rolls a tric-trac, the player plays 2 * 1 & 2 * 2 & 2 * 5 & 2 * 6.
• If a player rolls a 3 and a 4, the player is allowed to move backwards.
• Each player starts in their 1st quarter.
• A player can only move dice to the 2nd and 3rd quarter, if all player's dice are on the board.
• A player can only move dice into the 4th quarter, if mo more dice are in the 1st quarter.
• All dice in the 4th quarter cannot be moved within that quarter.
• All dice in the 4th quarter need to be thrown out with an exact number.
• A single checker in a row is unprotected and can be thrown out by the competitor.
• Two or more checker in a row are protected and blocking this row for the competitor.
• A checker that had been thrown out by the competitor must be brought in before making other moves.

Checker states:

• Initial: The checker hasn't been brought on the board yet or had been thrown out by the competitor.
• Progress: The checker is currently on the board.
• Finished: The checker had been cleared from the board by the player.

Dice states:

Roll Move 1 | 1 4 * 1 1 | 2 tric-trac 1 | 3 1 & 3 1 | 4 1 & 4 1 | 5 1 & 5 1 | 6 1 & 6

Roll Move 2 | 1 tric-trac 2 | 2 4 * 2 2 | 3 2 & 3 2 | 4 2 & 4 2 | 5 2 & 5 2 | 6 2 & 6

Roll Move 3 | 1 1 & 3 3 | 2 2 & 3 3 | 3 4 * 3 3 | 4 3 & 4 3 | 5 3 & 5 3 | 6 3 & 6

Roll Move 4 | 1 1 & 4 4 | 2 2 & 4 4 | 3 3 & 4 4 | 4 4 * 4 4 | 5 4 & 5 4 | 6 4 & 6

Roll Move 5 | 1 1 & 5 5 | 2 2 & 5 5 | 3 3 & 5 5 | 4 4 & 5 5 | 5 4 * 5 5 | 6 5 & 6

Roll Move 6 | 1 1 & 6 6 | 2 2 & 6 6 | 3 3 & 6 6 | 4 4 & 6 6 | 5 5 & 6 6 | 6 4 * 6

tric-trac = 2 * 1 & 2 * 2 & 2 * 5 & 2 * 6