CO Fold to 4-Bet

CO Fold to 4-Bet

Definition and Context

The CO Fold to 4-Bet statistic (often abbreviated as CO Fold to 4B or CO F4B) records the percentage of times a player in the Cutoff (CO) position folds when they are confronted with a 4-bet. This stat is most commonly derived from situations where the CO player first made a raise (either an open raise or a 3-bet) and then faces a 4-bet from an opponent. In poker tracking software, it is typically calculated as:

Number of folds to a 4-bet while in the CO / Number of opportunities to fold to a 4-bet while in the CO

Importance in Strategy

• Exploitation of Aggression: A high CO Fold to 4-Bet (e.g., >70%) indicates that the player is over-folding to 4-bets. Opponents can exploit this by 4-betting more aggressively against that player's raises from the CO, particularly when holding a wide range. Conversely, a low fold % (e.g., <30%) suggests the player is sticky and may call or 5-bet often, making it less profitable for opponents to 4-bet bluff.
• Range Construction: In GTO (Game Theory Optimal) play, frequencies are balanced to make the opponent indifferent. The CO Fold to 4-Bet stat helps players adjust their own 4-betting strategy. For example, if a specific CO opponent folds too often, you can expand your 4-bet bluffing range. If they rarely fold, you should tighten your value 4-bets and include more bluffs in your calling range.
• Positional Dynamics: The Cutoff is a late position, so its open-raising range is generally wide. Therefore, the CO Fold to 4-Bet is influenced by stack depths, opponent tendencies, and tournament stage (in multi-table tournaments with ICM considerations).

Typical Ranges

There is no universal “correct” number, but in typical cash games:

• Tight/Passive: Over 70% fold — indicates the player is weak against 4-bets.
• Balanced: Around 50-65% — often seen in solid regulars who adjust to opponents.
• Loose/Aggressive: Below 40% — indicates the player is willing to continue with a wide range against 4-bets.

Factors Affecting the Stat

• Estimate of Opponent's 4-Bettig Range: If the opponent is perceived to have a narrow value range, players fold more; if the opponent 4-bets wide, they call or 5-bet more.
• Stack Depth: Deeper stacks (e.g., 100bb+) allow for more post-flop play, so players may call 4-bets more often. Shorter stacks (<40bb) often force fold or all-in decisions, altering fold rates.
• Tournament vs. Cash: In tournaments, ICM pressure can cause tighter folds, especially near the money or final table.
• History and Reads: Past 3-bet/4-bet dynamics heavily influence current decisions.

How to Use in HUD

• Sample Size: The stat becomes reliable after at least 25-50 opportunities. With small samples, treat it as noise.
• Combine with Other Stats: For a complete picture, look at CO 3-Bet, CO Raise First In, and Overall Fold to 4-Bet (across all positions). A high CO Fold to 4-Bet paired with a low CO 3-Bet might indicate a passive approach.
• Exploitative Adjustments: Against a high-fold opponent, increase your 4-bet frequency when they open from CO. Against a low-fold opponent, tighten your value 4-bets and consider flatting more often.

Summary

CO Fold to 4-Bet is a key metric for understanding how a player responds to aggression from the Cutoff. It directly informs exploitative 4-betting and 5-betting decisions. While GTO frameworks provide baseline frequencies, real-world adjustments based on this stat can significantly improve win rates. Always consider sample size and context before making large strategic changes.