AF from CO

Overview

AF stands for Aggression Factor, a common HUD statistic in online poker. It is calculated as (Bets + Raises) / Calls. This formula only counts actions when the player voluntarily puts money into the pot (excluding blinds). A higher AF indicates a more aggressive post-flop style, while a lower AF suggests a passive or calling-oriented approach.

Interpretation

• AF > 2.0: Generally aggressive. The player tends to bet or raise rather than call.
• AF 1.0 - 2.0: Moderate aggression. Balances betting and calling.
• AF < 1.0: Passive. Prefers calling over betting/raising.

Position Specificity: Cutoff (CO)

When filtered "from CO," the stat considers only hands where the player is in the cutoff—the seat two to the right of the button (in a 6-max game) or one to the right of the hijack. The cutoff is a late position, giving the player information from early and middle positions but still facing potential action from the button and blinds.

• A high AF from CO suggests the player exploits late position by frequently betting and raising, especially when first in or when opponents show weakness.
• A low AF from CO might indicate the player prefers to see flops cheaply or trap with strong hands, but could also mean they are too passive from the cutoff.

Limitations

AF is a small-sample stat; thousands of hands are needed for reliable interpretation. Also, AF does not distinguish between bet and raise, nor does it account for bet sizing or opponent tendencies. Players with very high VPIP may have artificially low AF due to many calls, while extremely tight players may have high AF with few calls.

Example

A player with VPIP 22%, PFR 18% from CO, and AF 3.5 is likely aggressive post-flop. They enter pots with raises and continue to bet/raise when they connect. In contrast, a player with VPIP 22%, PFR 18%, and AF 1.2 from CO may be calling too much post-flop, making them exploitable.

Conclusion

AF from CO is a useful metric to gauge a player's post-flop aggression in late position, but should be considered alongside other stats like VPIP, PFR, and hand sample size for accurate reads.