Minimum defence frequency (MDF)
Minimum defence frequency is the share of your range you must continue with to stop a bet from profiting with any two cards.
It is the pot divided by the pot plus the bet. Against a half-pot bet it is 67%, against a pot-sized bet 50%.
MDF is a guard against being bluffed too easily, not a rule to follow blindly. Against an opponent who rarely bluffs, folding more often than MDF is correct.
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.