Exactly: data that is readily available.
This is not some advanced metric. Former Sabres goalie coach Jim Corsi invented this stat solely to help determine whether to start a goalie in back to back games. The idea being that shots on goal was not good enough. A goalie had to prepare for every shot at the net, so in a game where he only faced 20 shots (a light workload) there might have been 50 shots at goal... And he would be tired.
Nothing advanced in any way, but a great metric for goalie workload.
Stats guts then looked at it and determined that it did a decent job of modeling the game.
But nothing advanced about any of it. Simply good, common sense. If your team corsi is 40, you are getting out shot 30-20 every game, and will likely lose more than you win. Simple stuff really
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