Event: Division One

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Opponent Rating Result
Sean Ralph 159 1 - 0
Cory S Hazlehurst 169 1 - 0
Mark A Drugan 150 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

559 = (478 + 400 * (3 - 0)) / 3)

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Opponent Rating Result
Simon A Williams 167 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-233 = (167 + 400 * (0 - 1)) / 1)