SB 3Bet

Overview

SB 3Bet refers to a specific betting action in no-limit hold'em (and other poker variants) where the player seated in the Small Blind (SB) makes a three-bet (3-bet) preflop. In poker betting rounds, a 3-bet is the third action in a sequence: the first bet (or blind) is the big blind, the second is a raise, and then a re-raise is the third bet – hence “3-bet.” When the re-raise comes from the small blind, it is termed an SB 3Bet.

Strategic Importance

The SB is a disadvantageous position postflop because the player acts first in every betting round after the flop. Therefore, an SB 3Bet is often used to:

• Take the initiative: By 3-betting, the SB forces the original raiser to fold or continue out of position, putting pressure on the opponent.
• Isolate: The SB can force out other players (e.g., the big blind) and go heads-up against the original raiser, but still out of position.
• Value and bluff: The SB will 3-bet with a polarized range – strong hands for value (like QQ+, AK) and some bluffs (e.g., suited connectors) to balance the strategy.

Because of positional disadvantage, SB 3-bet sizing is typically larger (e.g., 3x to 4x the raise) to discourage calls and to maximize fold equity. In GTO (Game Theory Optimal) strategies, the SB 3-bets less frequently than the Button or Cutoff due to positional weakness.

Example Hand

Example (No-Limit Hold’em, 6-max):

• Blinds: 0.5/1
• Folded to CO who raises to 3
• Hero in SB with A♠K♦ decides to 3-bet to 10. This is an SB 3Bet.

The SB 3Bet here is for value; AK is strong and benefits from building a pot while also possibly inducing folds from hands like AJ or KQ that might suck out.

Common Adjustments

• If the original raiser folds often to 3-bets, the SB can widen their range (more bluffs).
• If the opponent calls frequently, the SB should tighten and rely on solid postflop play despite being out of position.
• When the big blind is aggressive and likely to squeeze, the SB may avoid 3-betting with marginal hands.

Related Terms

• 3-bet: Any re-raise preflop.
• Small Blind: The player to the immediate left of the big blind, forced to post half the big blind.
• Position: The order of betting; acting first postflop is out of position.
• Squeeze Play: A 3-bet intended to force out multiple opponents after a raise and a call.