What Does It Mean in Poker?

A blocker is a card held by a player that makes it impossible (or less likely) that an opponent has a hand that includes that card (or a card of the same rank). Also known as card removal or combinatorics, blockers are a fundamental concept in poker game theory.

For example, if you hold A♠ Kand the board reads J♠ T♠ 256, it’s impossible for your opponent(s) to have the ace-high flush as you hold the A♠ blocker. Similarly, if you hold 77 and the board reads 8 6 5 Q♠ K♠, it is significantly less likely that your opponent has a straight as you block half of the possible combinations of 9-7 and 7-4.

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