Double barrel

A double barrel is a turn bet from whoever fired the flop continuation bet and got called, continuing the same story on a new card. As a bluff it works only when the turn helps the bettor's range more than the caller's: an overcard to the flop, or a card that completes a draw the bettor holds more often than the caller does. A brick that changes nothing, or a card that hits the caller's floats and draws, removes the fold equity the barrel needs and turns a second bet into a donation.

Worked example. The pot is 14.5bb entering the turn after a flop bet and call. The turn brings an overcard and the aggressor barrels 10bb into that pot:

bet as a fraction of pot = 10 / 14.5 = 0.690

Sizing up close to a 70% pot bet on a card that favours your range squeezes maximum pressure out of a caller who now faces a second, bigger question after already committing chips once.

Barrel the right cards with the right hands, and give up cleanly on the ones that help your opponent instead.