PFR from BB

Overview

PFR from BB is a positional poker statistic that measures a player's aggression from the big blind before the flop. It specifically tracks the frequency with which a player chooses to raise (rather than call or fold) when they have the option to act first post-flop after the blinds are posted. This stat is part of the broader PFR (Pre-Flop Raise) family but is isolated to the big blind situation, which is unique because the big blind already has a forced bet in the pot.

Calculation

PFR from BB is calculated as: (Number of times player raised from big blind pre-flop) / (Total number of opportunities to raise from big blind pre-flop). Raises include standard opens, 3-bets, 4-bets, etc., but only when the player is in the big blind. Limping (calling) is not counted as a raise; folds are also not counted. The denominator counts all hands where the player had the option to raise from the big blind, including when facing a raise from another player or when the action is limped to them.

Typical Values and Variation

In modern online games, a typical PFR from BB might range from 8% to 15% for a solid regular player. Higher values indicate aggression, often with a wider range of hands. Lower values suggest a more passive approach, typically only raising premium hands. The stat can vary significantly based on stack sizes, table dynamics, and the player's overall style. For example, a player with a high overall PFR may also have a high PFR from BB, but this is not always the case due to positional adjustments.

Strategic Implications

• Defensive vs. Aggressive: A high PFR from BB (e.g., >12%) indicates a player who often fights back against steals or raises with a wide range. This can put pressure on late-position raisers but also risks being exploited by 4-bets. A low PFR from BB (<6%) suggests a player who primarily defends by calling, which can be exploitable if they fold too much to continuation bets.
• Steal Defense: When facing a late-position open, the big blind's PFR stat reveals how often they will 3-bet. A high PFR from BB means they are likely to 3-bet light, so steal attempts should be made with stronger hands or be prepared to 4-bet. Conversely, a low PFR from BB means they will call more often, allowing the raiser to have better implied odds post-flop.
• Adjustments: Skilled players adjust their PFR from BB based on opponents. Against tight raisers, they may raise more (to punish weak ranges); against loose raisers, they may tighten up to avoid 4-bet wars. Stack depth also matters: deeper stacks allow more profitable 3-bets with speculative hands, while shorter stacks may push toward all-in or fold decisions.

Limitations

PFR from BB is a population-based statistic and may not account for situational factors like tournament stack sizes, ICM pressure, or opponent tendencies. It should be used in conjunction with other stats (like VPIP, fold to 3-bet, etc.) for a complete picture. Also, small sample sizes can make the stat unreliable. For example, after only 50 hands, a PFR from BB of 20% could mean just 10 raises, which may not reflect the player's true strategy.

Conclusion

PFR from BB is a useful metric for understanding a player's aggression from a specific position. It helps in constructing ranges, adjusting steal attempts, and identifying defensive tendencies. When combined with overall PFR and VPIP, it contributes to a more nuanced strategy analysis.