AFq from SB

Small Blind Aggression Frequency (AFq from SB)

Definition and Calculation

AFq (Aggression Frequency) measures the proportion of times a player actively chooses to bet or raise (rather than check or call) in a given situation. AFq from SB specifically refers to the aggression frequency when the player is in the Small Blind position.

The calculation formula is typically: [ \text{AFq} = \frac{\text{Number of Bets} + \text{Number of Raises}}{\text{Number of Bets} + \text{Number of Raises} + \text{Number of Checks} + \text{Number of Calls}} \times 100% ] Note: Fold is not included in the denominator because folding is a passive action but does not involve an offensive or defensive decision.

Significance

The small blind is one of the most disadvantageous positions preflop, as the player is always out of position (OOP) when betting postflop. Therefore, AFq from SB can reflect whether a player maintains aggression even from a disadvantaged position.

• High AFq (e.g., >50%): Indicates the player frequently bets or raises from the small blind, possibly as part of an aggressive or balanced strategy.
• Low AFq (e.g., <30%): Indicates the player tends to check or call more often, likely adopting a passive or defensive strategy.

Relationship with Position

• Compared to the Button or Cutoff, AFq from the small blind is generally lower because positional disadvantage inhibits aggression.
• However, in some GTO strategies, the small blind may still bet frequently on specific flop textures (e.g., small boards, wet boards) to increase bluff efficiency.

Application

When analyzing opponents, AFq from SB can help assess their range tendencies. For example:

• If an opponent's SB AFq is significantly higher than from other positions, they may be overcompensating for positional disadvantage but could be exploited by re-raises.
• If AFq is extremely low, their postflop range is more predictable, allowing you to target them with fold equity strategies.

Note: AFq requires a sufficient hand sample (at least several hundred hands) to be statistically meaningful; single-session results can have high variance.