MASTER NOTES: Early PRO SP rankings

Back in 2017, I came up with a new metric for assessing players. I first called it “Positive Relative Outcomes” (PRO), but changed it to “Percentage Ratio Outcome” (PRO), to avoid associations with my relatives. You can go back for the details and early examples here and here

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  For more information about the terms used in this article, see our Glossary Primer.