What Is the Difference Between Corsi and Fenwick?
What is the difference between Corsi and Fenwick in hockey analytics, and why do analysts use both metrics to evaluate puck possession?
Editor: Coach Mark • Updated: December 12, 2025
Short Answer
The main difference between Corsi and Fenwick is that Fenwick excludes blocked shots, while Corsi includes all shot attempts.
Full Explanation
Both Corsi and Fenwick are possession-based hockey analytics metrics designed to estimate which team controls play more often. They do this by counting shot attempts rather than focusing only on goals or shots on net.
Corsi includes every shot attempt directed toward the net: shots on goal, missed shots and blocked shots. Fenwick removes blocked shots from this calculation to reduce noise created by defensive systems that intentionally block shooting lanes.
Because blocked shots can reflect tactical choices rather than true puck control, some analysts prefer Fenwick as a slightly cleaner possession signal. In practice, however, Corsi and Fenwick usually tell a very similar story over large sample sizes.
The choice between Corsi and Fenwick often comes down to analyst preference and context. Both metrics are most effective when evaluated at even strength and over longer periods of time.
When to Use Corsi or Fenwick
Corsi is useful for broad evaluations of territorial dominance and overall play-driving. Fenwick can be helpful when analysts want to minimize the impact of blocked shots and focus more directly on unimpeded offensive pressure.
Key Takeaways
- Corsi includes all shot attempts, including blocked shots.
- Fenwick excludes blocked shots to reduce defensive-system noise.
- Both metrics estimate puck possession and territorial control.
- They are most reliable over large samples and at even strength.