Probe Bet from BB

Introduction

A probe bet from the big blind occurs when the preflop aggressor (usually the raiser) checks the flop or turn, and the big blind, who called preflop, decides to bet. This is a common tactic in both live and online poker, especially in heads-up or multiway pots. The big blind, having checked preflop, often has a weaker range than the raiser, but a probe bet can be effective when the raiser shows weakness by checking.

When to Use a Probe Bet from the Big Blind

Probe bets are typically used in the following situations:

• Marginal hands: When the big blind has a hand like middle pair, bottom pair, or a draw that would benefit from winning the pot immediately or building the pot.
• Denying equity: When the board is coordinated but the raiser checks, a probe bet can force folds from hands that have equity (e.g., overcards).
• Gaining information: A small bet can reveal the strength of the raiser's hand. If the raiser calls, the big blind often checks down on later streets.
• Exploiting passive opponents: Against players who check back strong hands rarely, a probe bet can be profitable.

Sizing and Frequency

Probe bets are generally smaller than continuation bets, often ranging from 1/4 to 1/3 of the pot. This sizing minimizes risk while still forcing folds from weak draws or overcards. Frequency should be balanced to avoid being exploited. Overusing probe bets can lead to the raiser adjusting with check-raises or floating.

Example

Scenario: $1/$2 No-Limit Hold’em. Hero is in the big blind with 8♠7♠. Preflop: Button raises to $6, Hero calls. Flop: J♦9♣3♠. Button checks. Hero bets $4 into a $13 pot (about 1/3 pot). This is a probe bet: Hero has a gutshot straight draw and often takes down the pot if Button missed. If Button calls, Hero can check down or bet again if a favorable card hits.

Strategic Considerations

• Board texture: Probe bets work best on dry flops (e.g., K-7-2) where the raiser's range contains many missed overcards. On wet flops (e.g., 9-8-6), a check from the raiser often indicates strength, making probe bets less advisable.
• Opponent tendencies: Against tight players who rarely defend without top pair, probe bets are effective. Against calling stations, they are less profitable.
• Balance: To avoid being predictable, the big blind should occasionally check-raise strong hands rather than always probing with weak-to-medium hands.

Common Mistakes

• Probing too frequently: This allows the raiser to exploit with check-raises or float with air.
• Betting too large: Large probe bets risk too much against a check-back range that may still be strong.
• Ignoring position: The probe bet is only available when out of position; in position, the caller can instead check behind.

Related Terms

• Probe bet: A broader term for any bet made by a non-aggressor when the aggressor checks.
• Float: Calling a bet with the intention of bluffing later streets.
• Check-raise: A common response to probe bets, especially by the raiser who checked with a strong hand.
• Delayed c-bet: A continuation bet on a later street after checking the previous street.