Post-Shot xG

What it measures

Shot quality after the strike, factoring in placement and contact.

The question it answers

Finishing and shot-stopping over/under-performance.

In the Variation framework

Post-Shot xG re-values a shot once it has been struck, using placement and contact. The gap between xG and PSxG isolates finishing quality; the gap between PSxG and goals isolates goalkeeping. It keeps the analysis honest about how much of a scoreline was chance creation versus execution.