CO AF

Overview

CO AF is a poker HUD (Heads-Up Display) statistic derived from tracking software like PokerTracker or Hold'em Manager. It filters a player's Aggression Factor (AF) to only include hands where they were in the Cutoff (CO) position—the seat immediately to the right of the button. This stat helps analyze how a player adjusts their aggression based on position.

Aggression Factor (AF)

AF is a postflop statistic calculated as:
AF = (Total Bets + Total Raises) / Total Calls
It measures a player's tendency to bet or raise versus call after the flop. A higher AF (e.g., > 2) indicates aggressive postflop play, while a lower AF (e.g., < 1) suggests passivity. AF does not include preflop actions (folds, checks, or preflop bets/raises).

Interpreting CO AF

Since the Cutoff is a late position with strong steal opportunities, players often have a higher AF from this seat compared to early positions. A high CO AF (e.g., > 3) suggests a player frequently bets or raises when they have initiative postflop, often continuation-betting or bluffing. This can indicate an aggressive, pressure-based style. Conversely, a low CO AF (e.g., < 1) implies the player calls more than they bet/raise, possibly revealing a passive or trapping approach in late position.

Usage in HUDs

CO AF is one of many position-specific stats. Others include EP AF (early position), MP AF (middle position), and BTN AF (button). Players use these to spot positional leaks: for example, a player with a high overall AF but low CO AF may be failing to capitalize on late-position advantages. Note that AF is most reliable with large sample sizes (e.g., hundreds of hands from that position).

Limitations

• AF does not separate bet and raise frequencies, nor does it account for bet sizing.
• It is a ratio, so a player who rarely calls but also rarely bets (e.g., many folds) may have an inflated AF.
• CO AF should be combined with other stats like VPIP, PFR, and C-bet frequency for a fuller picture.

Example

Suppose a player has 100 hands recorded in the CO: they made 50 bets and 20 raises (70 aggressive actions) and 10 calls. Their CO AF = 70/10 = 7.0, indicating very aggressive postflop play from this position. Against such a player, you might trap more or check-raise their continuation bets.