The Stranger
Registered User
- May 4, 2014
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I think there would have to be some work/research to set the percentages though. 97%, 60%, 10%, 0% are arbitrarily set and can vastly change the outcome. Also, is there any shot that is truly "no chance"? Unless a teammate falls on the goalie and he is unable to move, I can't see how any other shot can be 0% chance. It may be a low % to save it, but not 0%.
OK, so I had a vague recollection of this article when I was setting the percentages for the routine and difficult shot:
Boyle has calculated the expected save percentage on a clean shot to be .949, but it's .651 on shots immediately following a pass. From the goalie's perspective, any play which forces a change in angle and depth increases the difficulty on the save. Factor in differences in the number of these chances each team gives up, and you get an indication of how shot quality can affect a goalie's statistics.
http://www.nhl.com/ice/news.htm?id=744483
So maybe instead of 97% it's 95% for a routine save...and 65% for a difficult save.
I'd be quite interested to see a goalie ranked that way.
Edit: What jumps to mind is that screened shots are neither routine nor difficult... I feel like they get stopped around 80% of the time. How do they fit here?
How about for shots where the goalie is screened, and expected save percentage gets reduced by 15%. So if the save would be a routine save if it weren't for the screen, the routine screened shot expected SV% goes to 80%...and a difficult shot with a screen goes to 50%.