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Building a Prime

A prime is a series of consecutive made points, and it's one of the most powerful structures in backgammon. Nothing passes through a six-point prime - not a single roll in the game can jump it. Once you get the hang of building one, it's incredibly satisfying. The priming game is about containment: trap your opponent's checkers behind the wall and squeeze their options until the game is yours.

What Is a Prime?

A prime is two or more consecutive made points that block the opponent's checkers from moving past. The larger the prime, the harder it is to escape:

• 4-prime: restricts movement significantly. The opponent needs a specific combination to leap over it.
• 5-prime: a serious barrier. Escape requires rolling one of very few combinations.
• 6-prime (full prime): the maximum. No single roll can jump six consecutive points. The opponent is trapped until you break it.

A prime built inside your home board creates a closed board (also called a shutout). A prime in your outer board blocks the opponent's escape routes. Both are powerful.

Core Principles of the Blockade Strategy

Picture this: your opponent has two checkers stuck behind a five-point wall. Those checkers can't contribute to the race, can't make points in their own board, and can't threaten you. The longer they stay trapped, the more your advantage grows.

Trapping checkers also increases your chances of winning a gammon, because the opponent can't bear off checkers that are stuck on the wrong side of a six-point wall.

How to Build a Prime

Key Points to Secure

Start with the 5-point and the bar point (7-point). These two anchor any prime between your home board and outer board, and they're the most valuable individual points on the board for building a wall.

Using Builders

Bring builders down from the midpoint and the 8-point. Spread them across your outer board so that as many dice combinations as possible let you make a new point on the next roll. Try not to stack extra checkers on points you already own - those extras aren't helping you extend the wall.

Slotting for the Prime

Slotting (placing a blot on a key point in hopes of covering it next turn) is more justified in a priming game than in other situations. The reward of extending the prime by one point is often worth the risk of losing a checker.

Walking the Prime (The Advance)

Walking a prime means advancing the entire wall toward your home board. The technique: break the back point of the prime and use those checkers to make a new point at the front. The wall shifts forward one point at a time, maintaining its structure while moving closer to home.

Keeping the wall intact is critical. Even a one-point gap gives the opponent a chance to escape. The catch is that walking requires spare moves. If you run out of useful things to do and start crunching (breaking your own points because you have nothing else to play), the prime falls apart.

This is where timing comes in. The best priming positions have extra checkers (spares) that absorb awkward rolls without forcing you to break the wall. Having enough of those spare moves is what separates a winning prime from a crumbling one.

Priming vs. Blitzing

The blitz and the prime are backgammon's two attacking strategies, and they work differently:

Blitz: hitting and closing. Aggressive, high variance. You're trying to shut the opponent out completely.

Prime: blocking and trapping. Positional, controlled. You're containing the opponent and grinding them down.

In practice, a blitz that stalls often transitions into a priming game. The opponent manages to anchor, but their checkers are still trapped behind the points you made during the attack. The checkers you used to blitz become the wall that traps.

Counter-Strategies: Facing a Prime

When you're the one trapped behind a prime, your options are limited - but it's not hopeless. You need to maintain your own board while waiting for the opponent to roll awkwardly and leave a gap. If the opponent is forced to crunch their position, that creates your escape opportunity. Patience is your best friend here.

Hold your own points as long as possible. Every roll that forces you to break your board weakens your position further if you do escape. The goal is to keep your home board intact so that if the prime breaks, you still have a fighting chance.