Eight tables games from one plugin: Backgammon, Nackgammon, Hypergammon, Acey-Deucey, Fevga, Nardi, Plakoto and Chouette. No variant has code of its own; each is the handful of keys below.
Select the family and variant through the URL, as every family does.
<iframe
src="https://engine.moddable.games/play/?embed=1&family=backgammon&variant=standard"
style="width:100%;max-width:560px;aspect-ratio:1/1;border:none"
title="Play Backgammon"
></iframe>Keys go in the variant's engine.plugins.backgammon block.
| Key | Meaning |
|---|---|
movement | opposite or same: which way the two sides travel |
start | The track index of each side's starting point |
contact | hit, pin or block: what landing on a lone opposing checker does |
doublingCube, cubeOwner | Offer, take or drop a doubled stake; who holds the cube at the start |
gammons, backgammons | Double and triple stakes for a heavier loss |
aceyDeucey | A 1-2 is played, then a doublet of the player's choosing, then another roll |
headLimit, headDoubles | Checkers that may leave the starting point in one turn, and the opening doublets that may take one more |
primeLimit | No block this long with no opposing checker ahead of it |
firstPast | No second checker leaves the start until one has passed the opponent's |
pinStartWins | Pinning the opponent's last checker on its own start wins at once |
openingRoll | Each side rolls one die and the higher plays both |
games | A session of games: the box against a rotating team (Chouette) |
A turn begins with a { action: 'roll' } move, drawn from the game's seeded generator, so a game replays from its seed. A roll that names its dice ({ action: 'roll', dice: [3, 5] }) is played as that fall. Each checker move uses one die, { from, to, die }, and the turn continues until the dice are spent.
chanceOutcomes lists every fall of the dice with its probability, which is how a search weighs a roll instead of the one it got.
The AI chooses whole plays of the dice. Easy and medium judge the position after each play; hard and expert also weigh the best few plays over every one of the opponent's 21 rolls.