SB Fold to Check-Raise

Definition

SB Fold to Check-Raise is a poker HUD statistic that tracks how often the small blind (SB) folds when confronted with a check-raise on the flop, after the SB has made a continuation bet (c-bet) in position or out of position. It is expressed as a percentage and is calculated as: (Number of times SB folds to a check-raise) / (Total number of times SB faces a check-raise after c-betting on the flop).

Usage and Context

This stat is most relevant in heads-up or multi-way pots where the SB is the pre-flop aggressor and c-bets on the flop. It applies specifically when an opponent (usually the big blind or a limper) checks, the SB bets, and then the opponent raises. The stat only counts hands where the SB has the opportunity to fold, call, or re-raise.

In practice, the SB Fold to Check-Raise stat helps opponents identify how susceptible the SB is to bluffs or semi-bluffs. A high percentage (e.g., 70%+) indicates that the SB frequently releases hands to aggression, making check-raises profitable. A low percentage (e.g., 30% or less) suggests the SB defends strongly, often calling or re-raising, which can discourage check-raises.

Strategy Implications

From the perspective of the player in the small blind, understanding your own Fold to Check-Raise stat is important to avoid being exploitable. If you fold too often, opponents can profitably check-raise you with a wide range, including draws and weak pairs. To counter this, you should consider calling with marginal holdings that have potential to improve or re-raising with strong value hands.

For opponents (e.g., the big blind), targeting a small blind with a high Fold to Check-Raise stat can be a profitable strategy. When you check-raise, use a polarized range: strong made hands (for value) and draws (as bluffs). Against a low Fold to Check-Raise, check-raising with thin value may backfire if the SB calls or re-raises, so it's better to use check-raise more selectively.

Typical Values

Typical ranges vary by stake, game type, and player style. In general:

• Tight/passive players: 60-80%
• Aggressive/competent players: 40-55%
• Loose/calling stations: 20-35%

These are rough guidelines; a large sample size (hundreds of hands) is required for statistical reliability.

Related Concepts

This stat is often paired with other flop aggression stats like SB C-Bet, SB Fold to Flop Raise, or SB Check-Raise (as the aggressor). It is similar to Fold to Check-Raise but specifically focuses on the SB position. In multi-way pots, the stat may be less reliable due to smaller sample sizes.

Limitations

Like all HUD stats, SB Fold to Check-Raise is specific to the situation: only flops where the SB c-bets and then faces a check-raise. It does not account for turn or river actions, nor does it consider bet sizing—players may adjust their folding frequency based on the size of the raise. Always consider opponent tendencies and board texture when interpreting this statistic.

In summary, SB Fold to Check-Raise is a useful metric for identifying exploitable tendencies in the small blind's postflop behavior, aiding both defensive and offensive strategy adjustments.