What the hell is Corsi?
Look: Corsi is a shot-attempt metric that counts every puck directed toward the net, whether it ends up as a goal, a saved shot, a miss, or a block. In other words, it’s the raw volume of offensive pressure a team generates while at even strength. The name comes from Jim Corsi, the former Buffalo Sabres analyst who turned simple counting into a scouting weapon.
Fenwick: The stripped-down cousin
Here is the deal: Fenwick drops blocked shots from the equation, focusing only on unblocked attempts — goals, saves, and misses. The logic? Blocks are often more about defensive positioning than actual shot quality, so Fenwick tries to isolate “dangerous” chances. It’s a tighter, more predictive slice of the same data set.
Why they matter
By the way, these stats aren’t just vanity numbers. Coaches use Corsi and Fenwick to gauge possession, line effectiveness, and even player valuation. A positive Corsi% means your squad is outshooting the opposition, which usually translates to more scoring chances. Fenwick% does the same but with a higher correlation to actual goals because it ignores the noise of blocked attempts.
Reading the numbers
And here is why the percentages matter more than raw totals. A 55% Corsi indicates your team controls the puck 55% of the time during five-on-five play. Anything above 50% is a green light; below, you’re losing the battle for territory. Same principle with Fenwick: a 53% figure suggests a genuine edge in quality chances. The devil is in the context — zone starts, score-state, and quality of competition can swing these figures dramatically.
Common pitfalls
Stop treating Corsi as a goal predictor. It’s a possession proxy, not a scoring formula. Don’t forget that a high Corsi on a weak defensive line can mask underlying issues. Fenwick, while cleaner, still suffers from sample size quirks; a short stretch can inflate percentages and mislead decision-makers.
Applying them on the ice
When you line up a line, glance at its individual Corsi% and Fenwick% across the last ten games. If a center’s Corsi sits at 48% but his linemates sit at 55%, you’ve got a bottleneck — maybe the center is over-committing defensively. Swap in a player with a 52% Corsi and watch the shift. That’s the practical edge.
Real-world example
Check out this deep dive for a case study: https://betonicehockey.com/articles/corsi-and-fenwick-explained/. It breaks down a mid-season trade where a team’s Corsi dropped from .562 to .489 after losing a high-Fenwick forward, proving the metric’s predictive muscle.
Bottom line
Stop chasing goals alone; chase possession and quality attempts. Use Corsi to measure who’s owning the ice, and Fenwick to filter out the fluff. If you see a line with a Corsi% below 50% and a Fenwick% under 48%, that line is dead weight. Replace, adjust, and watch the board flip.
Actionable advice: pull your latest five-on-five logs, calculate each player’s Corsi% and Fenwick%, then bench anyone who sits below 50% on both metrics for the next game.