What are blockers in poker?
Blockers are cards in your hand that reduce the number of ways an opponent can hold specific hands. Holding the ace of spades on a three-spade board "blocks" the nut flush; holding A5s when 3-betting blocks AA and AK. Blockers are how you pick which hands to bluff with.
Why it matters
Since an opponent's range is a set of combinations, removing combos changes the odds. If you hold an ace, there are fewer combinations of AA and AK for them to have — so a 3-bet bluff with A5s runs into a premium less often than a 3-bet bluff with 76s. That's why small suited aces are the standard 3-bet and 4-bet bluff.
Blockers matter most in polarized spots: choosing river bluffs that block the value hands the opponent would call with, and choosing calls that block the bluffs they'd have.
The numbers
- Holding one ace removes 3 of the 6 combos of AA (50%) and 4 of the 16 combos of AK (25%) from an opponent's range.
- In HoldemPro's charts A5s–A2s 3-bet at mixed frequencies from the blinds (30–60%) precisely because of their blockers; suited connectors without blockers 3-bet less.
Figures come from the same preflop charts and research data the rest of the site uses (charts last updated July 5, 2026); they change when that data does.
3-bet, call and fold ranges for every seat facing an open, plus a frequency matrix and sizing.
Common questions
Why is A5s a good 3-bet bluff?
It blocks AA and AK (the hands most likely to 4-bet you), makes the nut flush and a wheel straight when called, and folds to a 4-bet without regret. It also plays better than A5o because suitedness adds equity.
What are unblockers?
Cards you'd rather not hold because they block the hands you want the opponent to have — for example, holding a king when you want them to have a king-high bluff you're trying to catch.
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