Probe Bet from SB

Overview

A probe bet from the small blind (SB) occurs when the SB called a preflop raise and then leads out on the flop (or turn) after the preflop aggressor checks. This bet's purpose is to 'probe' the opponent's hand — to see if they actually have a strong holding or if they missed the flop and are likely to fold. The SB uses the opportunity to take control of the hand when the aggressor shows weakness by checking.

When to Use It

Probe bets are effective in situations where the SB has a marginal hand or a draw and wants to win the pot without showdown. Typical conditions include:

• Heads-up or short-handed pots: The SB is less likely to get raised by a multiway field.
• Dry or low-coordination flops: Boards like K-7-2 rainbow reduce the chance the preflop raiser connected strongly.
• Opponent has a high check-fold frequency: If the preflop aggressor often checks back weak hands, a probe bet can force folds.

Considerations

• Sizing: Usually 1/3 to 1/2 pot — enough to fold marginal hands but cheap if raised.
• Range advantage: The SB’s calling range is often capped (no premium overpairs or top pairs unless slowplayed). The preflop aggressor still has stronger hands in their range, so the probe bet must be balanced with value hands.
• Stack sizes: Short stacks make probe bets less effective due to lesser fold equity; deep stacks allow more flexibility.
• Opponent tendencies: Against aggressive players who check-raise often, probe bets lose value; against passive players, they work well.

Example

Blinds 50/100, effective stacks 10,000. UTG raises to 250, SB calls (BB folds). Flop: A♠8♥3♣. UTG checks. SB bets 200 with 9♥8♥ (middle pair). This probe bet tests if UTG has an ace or a pocket pair; if UTG folds hands like KQ or 77, the SB wins a pot they might otherwise lose.

Related Terms

• Probe bet
• Continuation bet (c-bet)
• Float bet
• Check-raise