4Bet from SB

Overview

A 4Bet from SB occurs when the player in the small blind (SB) makes the fourth raise in a betting round. Usually, this means the SB re-raises a 3-bet made by an opponent (often the button or cutoff). The SB is at a positional disadvantage post-flop, so a 4-bet from this spot is typically done with a strong range or as a bluff with specific intentions.

Strategic Considerations

• Value Range: In cash games or tournaments, SB's 4-bet value range often includes premium hands like AA, KK, QQ, and AK. Some players also include JJ or AQs depending on opponent tendencies.
• Bluff Range: To balance, SB may 4-bet bluff with suited aces (e.g., A5s) or small pairs that block opponents' strong holdings. The bluff frequency should be adjusted based on the opponent's fold-to-4-bet stats.
• Stack Depth: Effective stack sizes matter. Deep stacks (100BB+) allow more bluffing, while short stacks (under 40BB) may push all-in instead of making a standard 4-bet.
• Opponent Profile: Against a loose 3-bettor, SB can 4-bet wider for value. Against a tight 3-bettor, 4-betting is mostly value-heavy.

Risks and Adjustments

• Position Problem: SB acts first post-flop, making it harder to realize equity with weaker hands. Thus, 4-betting from SB requires careful hand selection.
• Size: Standard 4-bet size is 2.2-2.5x the 3-bet, or a shove if stacks are short. Over-betting may fold out bluffs unnecessarily.
• Exploitation: If the SB 4-bets too often, opponents may 5-bet light. Conversely, if the SB rarely 4-bets, opponents can 3-bet wide profitably.

Example Hand

• Scenario: 100NL ($1/$2), effective stacks 200BB. SB holds A♠ K♣. Button 3-bets to $24. SB 4-bets to $60.
  • This is a standard value 4-bet. SB plans to call a 5-bet shove or fold if opponent shows extreme strength.

Conclusion

A 4-bet from SB is a powerful move that must be used judiciously due to positional drawbacks. It requires a clear plan for post-flop play or a willingness to commit pre-flop.