But a reliable metric needs consistent factors

Tennis serving & darts checkouts are mostly derived from consistent, known parameters. You can could even say penalty kicks in football.

But goals scored from open play?
Weather conditions
Pace / spin on ball as received
Defenders number & positioning
GK positioning (ability?)

These are all metrics that are virtually impossible to calculate yet have a bearing on the outcome.

Posted By: Henclrikus, Nov 27, 11:57:31