Blockers
A blocker is a card in your hand that makes it less likely your opponent holds certain hands.
Holding the ace of spades on a board with three spades means your opponent cannot have the nut flush. That makes the ace a good card to bluff with.
Blockers matter most on the river, when ranges are narrow and a few combos decide whether a bluff or a call is profitable.
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Related terms
Practise decisions like this in the trainer: ten hands at a time, with the answer and the reason.