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Polarization & Bluff-catching

Lesson 7 · Solver-backed MDF in polarized spots · 24 practice questions

Polarized betting

River bets are often polarized: nuts + bluffs, rarely medium hands. Medium hands prefer check.

Bluff-catching

Bluff-catchers beat bluffs but lose to value. Call at MDF frequency vs polarized bets.

Solver spot: pot bet MDF = 50%

In our HU solver spot, OOP bets pot with nuts always and mixes air. IP's bluff-catcher calls 50%.

Key takeaways

• River bets polarize to nuts + bluffs; medium hands prefer to check.
• Call bluff-catchers up to MDF — favor those that block value and unblock bluffs.
• Over-folding makes polarized bets automatically profitable.

Sample drill from this lesson

Solver spot (polar pot bet): river, pot=100, facing a pot-sized bet. You hold AA as a bluff-catcher vs a polarized range. Best default action?

Board: 2♣ 7♦ 9♥ J♠ 4♠
Your hand: A♦ A♣

Best action: Call

Why: ✓ You hold one pair as a bluff-catcher; vs a polarized bet, MDF = 1−100/200 = 50%, and you only need ~33% to call. Calling is right.

FAQ

What is a polarized betting range?

A polarized range is made up of strong value hands and bluffs, with medium hands checked. Big bets and overbets should be polarized so the bluffs are backed by real value.

What is bluff-catching?

Bluff-catching is calling with a hand that beats only the opponent’s bluffs. You keep enough bluff-catchers to meet the MDF and pick the ones that block the opponent’s value hands.

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