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Lesson 13 · Small vs big bets and MDF · 24 practice questions
A 1/3-pot bet needs ~25% MDF — you must defend wide with bluff-catchers and draws. Folding too much makes small bets auto-profitable.
Pot-sized or larger bets are polarized (nuts + bluffs). Medium hands should fold; only strong bluff-catchers and the top of your range continue.
Match bet size to your range story: small = merged/capped, big = polarized. When facing a bet, ask what size implies about villain's range.
• MDF = 1 − bet/(pot+bet) — smaller bets demand wider defense.
• Big bets are polarized; fold medium-strength hands.
• Use sizing to communicate range strength and exploit over-folding.
River, villain bets 1/3 pot into 40. You hold Q♣T♦ — second pair, no draw. Best action?
Board: Q♠ J♦ 4♣ 2♥ A♥
Your hand: Q♣ 10♦
Best action: Call
Why: ✓ You hold one pair as a bluff-catcher; vs a polarized bet, MDF = 1−13/53 = 75%, and you only need ~20% to call. Calling is right.
Bigger bets lower the defender’s MDF and demand more equity to call, but they also require more bluffs to stay balanced. Small bets let you bet a wider range at high frequency.
Use small bets to deny equity cheaply and bet a wide range on boards you own; use big bets and overbets with a polarized range when you hold a nut advantage.
Every answer in the 699-question bank is independently verified (adversarial blind-solve) before publication.
Also train preflop: Preflop Camp (GTO preflop trainer by the same maker)