Fold to 4-Bet from SB
Fold to 4-Bet from SB
The frequency with which a player in the small blind folds when facing a 4-bet preflop.
Overview
Fold to 4-Bet from SB is a statistical measure used in no-limit hold'em to analyze a player's behavior when they are in the small blind and face a 4-bet. It is typically expressed as a percentage, calculated as (number of folds to 4-bet) / (total times faced a 4-bet) × 100.
Usage and Importance
This stat is most relevant in heads-up or full-ring games when the small blind raises (opens or 3-bets) and then faces a 4-bet from the original raiser or a cold 4-bet. It helps assess how tightly or loosely the small blind defends against aggression. A high fold percentage suggests the player is overfolding and exploitable, while a very low percentage may indicate stubbornness with marginal hands.
Typical Ranges
In modern GTO strategies, the small blind should have a balanced approach, folding a moderate percentage but occasionally continuing with strong hands or bluffs. Against a standard 4-bet sizing (2.2-2.5x the 3-bet), a TAG player might fold around 40-60% of their 3-betting range. However, exact frequencies depend on stack depths, positions, and opponent tendencies.
Factors Affecting Fold to 4-Bet
- Stack Sizes: With deeper stacks (100bb+), the small blind can call 4-bets more often with speculative hands. Shorter stacks increase fold frequency.
- Position: Being out of position postflop makes the small blind more likely to fold to 4-bets compared to the big blind.
- Opponent's Range: If the 4-bettor is tight, folding more is correct; if loose, continuing with a wider range may be profitable.
- 3-bet Sizing: Smaller 3-bets induce more 4-bets and may require more folds.
Limitations
Fold to 4-Bet is a stat that requires a large sample size (usually >100 opportunities) to be reliable. It can be skewed by situational factors like bubble play in tournaments or specific table dynamics. Additionally, it only captures preflop decisions and does not account for postflop skill.
Strategic Implications
Players should adjust their fold-to-4-bet percentage based on exploitability. Against opponents who 4-bet too wide, the SB can call or 5-bet more often. Conversely, if an opponent rarely 4-bets, the SB should fold more and only continue with premium hands.