What Is the Doubling Cube in Backgammon? Rules, Strategy & Examples
If you have ever opened a complete backgammon set and wondered why there is a large die marked 2, 4, 8, 16, 32 and 64, you have already met one of the most important strategic tools in the game.
It is called the doubling cube.
Unlike regular dice, the doubling cube is not rolled to determine movement. Instead, it controls the value of the game.
For beginners, learning the cube is one of the biggest steps from simply knowing how to move the checkers to understanding how serious backgammon is actually played.
Quick Answer: What Does the Doubling Cube Do?
The doubling cube allows either player to propose doubling the current value of a backgammon game.
A game normally begins at a value of 1 point.
If one player offers a double and the opponent accepts, the game becomes worth 2 points.
Later, the player who accepted the cube may offer a redouble to 4 points, then potentially 8, 16, 32 and 64.
If a player refuses a double, they lose the game at its current value.
That simple rule creates an entirely new layer of strategy.
How Does the Doubling Cube Work?
At the beginning of a normal game, the doubling cube sits between the players and belongs to neither player.
Suppose Player A believes their position has become significantly stronger.
Before rolling their dice, Player A may offer a double.
Player B then has two choices.
They can take the double. The game continues, but it is now worth 2 points.
Or they can pass the double. The game ends immediately, and Player A wins the current value of the game.
If Player B accepts, Player B takes possession of the cube.
That detail matters.
Once a player owns the cube, only that player may offer the next redouble.
What Does “Take” Mean in Backgammon?
To take means accepting your opponent's double.
For example, imagine the game is currently worth 1 point.
Your opponent doubles.
If you take, the game continues at a value of 2 points.
Taking does not mean you believe you are winning.
It means you believe your chances are still good enough that continuing is better than immediately surrendering the current point.
This distinction is central to cube strategy.
A position can be unfavorable and still be a correct take.
What Does “Pass” or “Drop” Mean?
To pass, sometimes called dropping, means refusing the double.
The game ends immediately.
You lose only the value of the game before the proposed double.
For example, if the game is worth 1 and your opponent doubles to 2, passing loses 1 point rather than risking a larger result.
Knowing when to pass is not a sign of weakness.
Strong players frequently pass positions when the mathematical risk no longer justifies continuing.
Why Does the Doubling Cube Make Backgammon More Strategic?
Without the doubling cube, backgammon is primarily about checker movement, racing, blocking, hitting and probability.
With the cube, players must also evaluate risk and value.
You are no longer asking only:
“Who is more likely to win?”
You are also asking:
“How large is my advantage?”
and:
“Is this the right moment to increase the value of the game?”
The best cube decisions often happen before the position becomes obvious.
If you wait until your opponent has almost no chance of winning, they will simply pass.
A well-timed double usually comes when you have a meaningful advantage but your opponent may still have enough winning chances to consider taking.
That tension is what makes cube play fascinating.
When Should You Double in Backgammon?
There is no single board position that always means “double.”
The correct decision depends on several factors.
You need to consider your racing lead, board strength, checkers trapped behind primes, potential shots, gammons and how volatile the position is.
A position with many possible dramatic swings may require different cube judgment from a quiet pure race.
Beginners should therefore avoid thinking:
“I am ahead, so I should double.”
A better question is:
“Am I far enough ahead that I should increase the stakes, but not so far ahead that my opponent will automatically pass?”
That is a much more useful way to begin thinking about the cube.
A Simple Doubling Cube Example
Imagine you and your opponent are playing a game worth 1 point.
Your position improves significantly.
You offer a double.
Your opponent accepts.
The cube moves to their side, and the game is now worth 2 points.
Later, the position changes.
Your opponent becomes the favorite.
Because they now own the cube, they may offer you a redouble to 4.
You must then decide whether to take and continue for 4 points or pass and lose the current 2-point value.
This is why cube ownership matters so much.
It determines who has the right to increase the value next.
What Does the Number 64 Mean?
A standard doubling cube usually displays:
2, 4, 8, 16, 32 and 64.
The sequence represents repeated doubling.
In most everyday games, it is uncommon for the cube to reach the highest values.
The 64 face is also traditionally used as the neutral starting position on many boards, even though the game itself begins at a value of 1.
The cube is therefore both a scoring tool and one of the most recognizable accessories in a complete backgammon set.
Do Beginners Need to Use the Doubling Cube?
Not immediately.
If you are still learning how to set up the board, enter from the bar, hit blots or bear off, adding cube decisions can make the game unnecessarily complicated.
First become comfortable with normal checker play.
Once movement feels natural, introduce the cube.
It is one of the best ways to move from casual backgammon toward more serious match play.
The doubling cube teaches you to think not only about whether a position is good or bad, but how good or bad it really is.
Is the Doubling Cube Used in Tournament Backgammon?
Yes, the doubling cube is a core part of serious match play.
However, match conditions can affect how it is used.
For example, tournament matches often use the Crawford Rule, which temporarily removes the doubling cube from play for one game when a player first reaches one point away from winning the match.
We will cover the Crawford Rule separately because it deserves its own explanation.
This is also a useful internal-link opportunity once we publish the Crawford article.
Frequently Asked Questions
Is the doubling cube the same as a regular die?
No. Regular dice determine checker movement. The doubling cube changes the value of the game and is not rolled for moves.
Who can offer a double?
At the start, either player may offer the first double before rolling. Once a double is accepted, ownership of the cube passes to the player who accepted it, and only that player may offer the next redouble.
Do you have to accept a double?
No. You may pass. If you pass, the game ends and you lose the current value of the game.
Why do doubling cubes go up to 64?
Each face represents another doubling of the stakes: 2, 4, 8, 16, 32 and 64.
Should beginners play with the doubling cube?
Beginners can learn the basic game without it first. Once checker movement and basic strategy are comfortable, learning the cube is an excellent next step.