Fold equity
Fold equity is the value you gain from the chance that your opponent folds to your bet.
A bet can win in two ways: by being called by worse, or by making better hands fold. The second part is fold equity, and it is what makes a bluff profitable.
A half-pot bet with no chance of winning when called needs folds 33% of the time to break even. If your opponent folds more often than that, the bet makes money.
Work it out
Bluff break-even calculator: Enter the pot and your bet. The calculator shows how often your opponent has to fold for a bet with no equity to break even.
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Related terms
Practise decisions like this in the trainer: ten hands at a time, with the answer and the reason.