River bets with too few bluffs

In this lesson

• Explain why some river lines hold fewer bluffs than the bet size needs.
• Fold more bluff-catchers where your own data shows few bluffs.
• Check the sample behind a river read before acting on it.
• Keep calling where a line still holds enough bluffs.

Read first: Adjusting to the player pool, Calling down with a bluff-catcher · Advice, not a lock: every lesson opens.

Concepts used: GTO and exploitative play, Bluff-catching, MDF and alpha

How many bluffs a bet needs

A river bet must carry enough bluffs that a bluff-catcher breaks even calling it: a third of the bets for a pot-sized bet, a quarter for a half-pot one. When a bettor carries fewer, every bluff-catcher loses by calling. Facing a pot-sized bet, 20 into 20, from a player whose bets are only 20% bluffs: 0.2 × 40 − 0.8 × 20 = −8 bb a call.

Rail's best response: fold more

Lock a river opponent to bet almost none of his air, and the lab's best response folds far more of its bluff-catchers. Middle and weak pairs fold most often of all, and even top pairs and two pairs fold more than the solve folds them. Its strongest hands keep calling and raising: they beat the value bets too.

Where the evidence is

The opponents panel cannot see a river bluff: it counts bets, and how often a player goes to showdown and wins there, which hints at what he shows down but does not count bluffs. The direct evidence is your own hands where you called a river bet and saw the cards. Those come a few a session, so a read on one player rarely clears its interval; across your whole pool, one line can.

Fold more where the evidence says so, and keep calling where a line still holds enough bluffs: folding everything turns you into the over-folder of lesson X2-L2.

From Rail's exploit lab: the read locked on a river solved on demand, the rest of the opponent's strategy kept at the solve. The ranges rest on Rail's narrowing model.

Rules of thumb

• A pot-sized bet needs a third bluffs, a half-pot bet a quarter.
• Against a bettor who rarely bluffs, fold more of your pairs.
• Judge a river read by what you saw called down, with its sample.

When they break

• A player who never bluffs one line may bluff another: read each line apart.
• Fold everything and you invite the bluffs back.

Example hands

Your own pool

Practice

The lesson is mastered when every exercise below that Rail can grade is passed. Missed items come back later as review cards.