Event: Summer League Division 3

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Opponent Rating Result
T Ed Sowerby 126 0 - 1
Andrew Nettleship 97 0 - 1
Mark Kirkham 107 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-23 = (330 + 400 * (1 - 2)) / 3)

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