AF from UTG+1

Concept and Calculation

AF (Aggression Factor) is a commonly used metric in poker tracking software to assess a player's aggressiveness. Its standard formula is: AF = (Number of Bets + Number of Raises) / (Number of Checks + Number of Calls). When applied to a specific position, such as UTG+1, it only accounts for actions taken from that position.

Significance of the Position

UTG+1 (Under the Gun +1) is the position after the under the gun (UTG) and is considered an early position. In a full ring game (9 or 10 players), UTG+1 is in a disadvantageous position, so the AF value for this position is typically low, as players tend to enter pots with stronger ranges and manage the pot more cautiously.

Interpreting AF Values

• AF < 1: Typically indicates a passive player at this position, more prone to calling than betting or raising.
• AF ≈ 1-2: Neutral to solid, common among most regular players.
• AF > 2: Indicates strong aggression, but a high AF from an early position may suggest a narrow range with strong hands. This should be interpreted alongside VPIP (Voluntary Put In Pot) and PFR (Preflop Raise). For example, a player with a low VPIP but high AF may be a tight-aggressive type.

Application Notes

AF statistics are affected by sample size, with significant variance in small samples. It is generally recommended to have at least 100 hands of data for meaningful reference. Additionally, AF does not differentiate between preflop and postflop actions; some software provides street-specific AF.