Event: League

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Opponent Rating Result
John Day 112 0 - 1
Les Walker 79 1 - 0
John Day 112 0 - 1
Stan J Smart 113 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-96 = (416 + 400 * (1 - 3)) / 4)

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