A♠Q♠ BTN vs BB, river on K♠ T♥ 7♠ 6♣ 2♠, 60 bb

Best play: Overbet 120% pot

Why

It is the river and hero holds the nut flush — A♠-high on the K♠ T♥ 7♠ 6♣ 2♠ board with three spades. After the BB checks this passive line, his capped range contains worse flushes, sets and two pair that will pay off but almost never the nuts, so the nut flush is never losing at showdown. Overbet 120% pot to extract maximum from those second-best value hands, with the size justified and balanced by the bluffs hero brings to this same overbet line.

Key idea

On the river, overbet the nuts against a capped range to charge the maximum from second-best value hands.

Common mistake

Checking back or making a small, timid bet with the nut flush, leaving heaps of value on the table against a range full of hands that would have called an overbet.