rulesdoubling cubestrategy
A single game of backgammon is a coin toss with opinions. The dice decide too much of it for one result to mean anything, which is why competitive backgammon is not played in games at all. It is played in matches, first to a set number of points, and the match score changes almost every decision inside it.
How does backgammon match play work?
A match is played to a target: first to five points, to seven, to eleven, to twenty-five in a final. Each game is worth one point normally, two if it ends in a gammon, three in a backgammon, and all of that is multiplied by the doubling cube.
So a game played to four on the cube that ends in a gammon is worth eight points, which settles most matches on its own. This is the first thing to understand about matches: they are usually not decided by many small games, they are decided by one large one.
What is the Crawford rule?
When either player first reaches match point, meaning they need exactly one more point to win, the very next game is played WITHOUT the doubling cube. That single game is the Crawford game. After it, the cube returns for the rest of the match.
One game, once per match, on the first occasion the leader reaches match point. It is not applied again if the score later reaches match point in some other way, and it is standard in essentially every tournament in the world.
Why does the Crawford rule exist?
Because without it the trailing player has a free lever. Suppose the score is four to two in a match to five. The leader needs one point; the trailer needs three. If the trailer may double at the start of every game, they should, immediately and always, because a doubled game they lose costs them nothing they had not already lost, and a doubled game they win closes the gap twice as fast.
That is not a strategy, it is an exploit, and it makes the endgame of every match identical. Crawford removes it by taking the cube away for exactly one game, so the leader gets one clean chance to finish.
Crawford is the rule that stops a lost match from becoming a free lottery ticket.
What does post-Crawford mean?
Every game after the Crawford game, while the leader is still at match point. The cube is back, and now the logic that Crawford suppressed applies openly: the trailing player usually doubles at the first opportunity, because the match is over anyway if they lose.
There is one famous exception, and it is worth knowing because it is the sort of thing that separates a club player from a tournament player. When the trailer needs an even number of points, holding the cube for one roll can be right, since the leader may throw a set that lets the trailer double into a more favourable position. The general shape is simple: double immediately when you need an odd number, think when you need an even one.
How does the match score change my doubling?
Enormously, and this is the real reason match play is a different game from money play. In a money game every point is worth the same. In a match, points above what you need to win are worth nothing at all.
- Leading by a lot, take fewer risks: a gammon you do not need cannot help you, and a doubled loss can undo the lead.
- Trailing by a lot, take more: variance is your friend when the safe path loses slowly and certainly.
- Near the end, count what you NEED rather than what you would gain. A two-point win and a four-point win are identical when two points takes the match.
- Beware the free drop: post-Crawford, when the trailer needs an even number, the leader can sometimes decline a double at no cost at all.
Serious players study this through match equity tables, which give the probability of winning from every score. You do not need to memorise one to benefit. Simply asking how many points would actually change the match, before you touch the cube, removes most of the errors.
Do I need match play to enjoy the game?
No. Single games are how most backgammon has always been played, over tea, one after another, and the doubling cube alone gives them plenty to argue about. Match play is what you reach for when you want the result to mean something, because it is the format in which skill reliably beats luck.
That is also why a ranked ladder is built the way it is: many results, rated, so that a season measures a player rather than an evening. Our note on how the leagues and trophies work goes through that side of it. The door at orion.arthea.ai/go carries the App Store and Google Play links and always shows what is available right now.