WWSF from CO

Overview

WWSF stands for "Win When Saw Flop." When specified "from CO," it refers to the statistic specifically for hands where the player saw the flop while seated in the cutoff position (the seat to the immediate right of the button). This metric is commonly used in online poker tracking software (e.g., PokerTracker, Hold'em Manager) to evaluate a player's post-flop profitability from a particular position.

Interpretation

WWSF is calculated as the percentage of times a player wins the pot after having seen the flop, regardless of whether they go to showdown or not. A high WWSF from CO (e.g., > 50%) generally indicates strong post-flop play from that position, as the cutoff offers positional advantage over the blinds and earlier positions. A low WWSF (e.g., < 40%) may suggest leaks such as calling too wide pre-flop, poor post-flop decision-making, or excessive bluffing from that seat.

Usage in Analysis

• Player profiling: A reg with a high WWSF from CO is likely aggressive and selective, exploiting position well. A fish might have a very low or very erratic WWSF.
• Adjustment: Against a high-WWSF cutoff opener, you may want to defend your blinds more carefully or 3-bet more. Against a low-WWSF player, you can call lighter and expect to outplay them post-flop.
• Sample size: Like all stats, WWSF requires a meaningful sample (at least a few hundred hands from that position) to be reliable.

Relationship to Other Stats

WWSF is often used alongside VPIP (Voluntarily Put Money In Pot) and PFR (Pre-Flop Raise) to build a complete picture. For example, a cutoff player with a VPIP of 25% and WWSF of 55% is likely a solid winning player. However, WWSF alone does not account for hands won without a flop (e.g., pre-flop steals), so it should be considered as part of a broader dataset.

Limitations

• WWSF does not differentiate between showdown and non-showdown wins. A player who frequently folds opponents before showdown may have a high WWSF without actually having strong hands.
• It is strongly influenced by runout variance; short-term swings can distort the stat.
• The stat is not commonly pooled across databases; it is tracked per individual player.

Strategic Implications

From the cutoff, a high WWSF can justify opening a wider range, since you win often after the flop. Conversely, if your own WWSF from CO is low, consider tightening your pre-flop opening range or reviewing your post-flop strategies (e.g., continuation betting, hand reading).