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MDF is the minimum share of your range you must continue with against a bet so the bettor can’t profitably bluff any two cards. It equals pot ÷ (pot + bet).
MDF answers a different question than pot odds. Pot odds tell one hand whether to call; MDF tells your whole range how often it must defend to stay unexploitable. Defend less than the MDF and the opponent can bluff any two cards for an automatic profit.
Because MDF depends only on bet size, bigger bets lower it — a defender owes less against a large bet. In practice you meet the MDF with your best bluff-catchers and give up your worst hands, and against players who under-bluff you can correctly defend below the MDF (an exploitative over-fold).
Exactly 50%. MDF = pot ÷ (pot + bet), and when the bet equals the pot that’s pot ÷ 2·pot = 50%.
No. MDF is the unexploitable baseline. Against opponents who rarely bluff you should over-fold; against players who bluff too much you should over-call beyond the MDF.
Full lesson: Pot Odds, MDF & Implied Odds →
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