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PBI is the difference between expected score and real score. The expected score is based on difference between ratings.
- Zero difference is 50% expected score
- -800 difference is 1 to 20 odds, which is 1/(20+1) or 4,76% expected score
- -1600 difference is 1 to 20^2 odds or 0,25% expected score
- -Infinite difference is 0% expected score
MN
