Problem with shots for and against is that you can rack up 30 shots in a game and get few quality chances and in the next night you could get only 20 shots on net and have 1/4 of them very quality chances. Until there's a metric that can differentiate perimeter shots from quality shots using shots for and against isn't incredibly meaningful on it's own. Flames this season have scored a lot of goals off odd-man rushes through their transition game rather than sustained pressure which will skew analytics like PDO.
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