Open Raise from BB

Overview

An Open Raise from BB occurs when the player in the big blind (BB) is the first to raise preflop after the action has folded to them or after they have called the big blind. Since the big blind already has a forced bet in play, they have the option to check or raise when no prior raise exists. The term is most commonly used when the BB faces limpers (players who only called the big blind) and decides to raise, reopening the betting.

When It Happens

The scenario arises in two main situations:

• All fold to the BB: If every other player folds, the BB automatically wins the pot without a raise. However, if the BB mistakenly or intentionally raises, it is technically an ‘open raise’ but wasteful in practice.
• Limpers present: This is the typical case. One or more players call the big blind but do not raise. The BB then has the option to check (taking a free flop) or raise. That raise is considered an open raise because the BB is the first to voluntarily inject new money beyond the blinds.

Strategic Considerations

• Value vs. Protection: Raising from the BB with limpers allows the BB to build the pot with strong hands while also protecting their hand against multiple opponents. It denies limpers cheap flops and forces them to fold weaker holdings.
• Hand Ranges: The BB’s raising range in this spot is typically polarized—strong value hands (e.g., premiums like AA, KK, AK) and sometimes suited connectors or small pairs as semi-bluffs, depending on the tendencies of the limpers and the stack sizes.
• Sizing: The raise size is often larger than an open raise from early position, usually 3–4 big blinds plus an extra big blind for each limper (e.g., to 4x–5x BB). This pricing out limpers and reducing the field.
• Defensive Raises: Some skilled players occasionally raise with weak hands to avoid playing a multi-way pot out of position. This is a defensively motivated open raise, though high-risk.

Example

In a 1/2 NLHE game, the cutoff and button both limp (call the $2 big blind). The small blind folds. The big blind holds A♠K♠ and raises to $10 (4x BB plus $2 per limper). This is an open raise from BB, isolating the two limpers.

Related Concepts

• Squeeze Play: When the BB raises after a raise and multiple callers (not an open raise).
• Limping: Calling the big blind preflop instead of raising.
• Open Raise: The first voluntary raise in a betting round.

Understanding when and how to execute an open raise from the BB is crucial for a well-rounded preflop strategy, especially in positions that typically act last after the flop but first preflop in this scenario.