We continue our series on cluster counting by learning a few more common clusters for checkers near and around our home board.

### 4. The deck

Continuing with our series of named cluster positions, we have **the deck**. This one is a prime that extends from the 5-pt to the 8-pt. It’s aptly named, since not only does its low, flat structure resemble a deck (7-8 pts) that extends beyond just your house (5-6 pts), but it contains **52 pips**, just like a deck of cards. This one is kind of an earworm, where once you hear about it it’s unforgettable!

A common cluster worth remembering is the just *exterior* part of the deck: if we have both our 7- and 8-pts made, those checkers add up to an easy **30 pips**:

Another related cluster that appears frequently is the one below, including 5 checkers on the 6-pt. It’s the cluster that arises when you make the bar with an opening 61 roll:

This cluster is worth **60 pips**.

### 5. Primes

We already tackled 5-primes in part 1 of this series. There turns out to be a great trick that works on ** any double-decker prime**: you add the front point and the rear point and you multiply by the length of the prime.

For example, consider **the deck**, which is just a 4-prime:

The length of the prime is 4. It starts on the 5-pt and extends to the 8-pt. Using the formula (5 + 8) × 4 gives us 52, as expected for the deck.

Another example: the 7-prime below extends from the 2-pt to the 8-pt:

(2 + 8) × 7 = **70 pips**. We can double-check this tally by treating it like a 5-prime centered around the 4-pt (40 pips) and the 7-8-pt exterior deck (30 pips).

Next lesson: Cluster counting 3: outfield points

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