# MDF (Minimum Defense Frequency)

> Source: [MDF (Minimum Defense Frequency) in the Smarter.Poker Glossary](https://smarter.poker/glossary/mdf)

## Definition
Minimum Defense Frequency, Or MDF, Is The Share Of Your Range You Must Continue With So That An Opponent's Bluff Cannot Profit Automatically. It Equals The Pot Divided By The Pot Plus The Bet, So Facing A Pot Sized Bet You Defend At Least Half Your Range. It Is A Guideline, Not A Rule, Against Opponents Who Rarely Bluff.

- **Category**: Math
- **Term Code**: `mdf`
- **DefinedTermSet**: [Smarter.Poker Poker Glossary](https://smarter.poker/glossary)

## Related Poker Terms

- [Pot Odds](https://smarter.poker/glossary/pot-odds) ([Markdown](https://smarter.poker/glossary/pot-odds.md)): Pot Odds Compare The Size Of A Call With The Pot You Could Win. Divide The Call By The Total Pot After You Call To Find The Equity You Need: Calling 50 Into A Pot That Will Be 150 Needs 33 Percent. If Your Equity Is Higher Than That Break Even Point, The Call Makes Money Over Time.
- [Under-Defense](https://smarter.poker/glossary/under-defense) ([Markdown](https://smarter.poker/glossary/under-defense.md)): Under-Defense Is Folding Too Often When Facing Bets, Which Lets An Opponent Profit By Betting Any Two Cards. A Player Defending Well Below The Minimum Defense Frequency In Common Spots Is Easy To Exploit With Bluffs. The Fix Is To Continue With More Hands That Have Equity Or Blockers, Not To Call Everything.
- [Range](https://smarter.poker/glossary/range) ([Markdown](https://smarter.poker/glossary/range.md)): A Range Is The Full Set Of Hands A Player Could Hold In A Given Spot, Based On Their Position And Every Action So Far. Strong Players Think In Ranges Rather Than Single Hands, Because Opponents Act With Many Hands In The Same Way. Reading A Range Means Narrowing It Street By Street As New Actions Arrive.
- [GTO (Game Theory Optimal)](https://smarter.poker/glossary/gto) ([Markdown](https://smarter.poker/glossary/gto.md)): GTO, Or Game Theory Optimal, Describes A Strategy That Cannot Be Exploited, Because No Opposing Strategy Can Win Against It In The Long Run. In Poker It Approximates A Nash Equilibrium Computed By A Solver. Players Study GTO To Build A Sound Baseline, Then Adjust Away From It To Exploit The Specific Mistakes Of Real Opponents.

## Related Strategy Lessons

- [Minimum Defense Frequency (MDF)](https://smarter.poker/learn/minimum-defense-frequency) ([Markdown](https://smarter.poker/learn/minimum-defense-frequency.md)): Minimum Defense Frequency Is The Share Of Your Range You Must Continue With So A Bluff Cannot Profit Automatically: Against A Pot Sized Bet It Is 50%, And Against A Half Pot Bet It Is 66.7%.

## Practice On Smarter.Poker

- [Multiway Poker Odds Calculator](https://smarter.poker/tools/poker-odds-calculator): Free Hold'em And Omaha Hand Versus Hand Equity Calculator.
- [Tournament ICM Calculator](https://smarter.poker/tools/icm-calculator): Free Malmuth-Harville Final Table And Bubble Equity Calculator.
- [Equity And ICM Calculators Guide](https://smarter.poker/features/poker-equity-calculators): Feature Specification For Multiway Equity And ICM Calculators.
- [GTO Training](https://smarter.poker/hub/training): Scenario Based Poker Training, Free To Play.

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