Event: Summer League Division 3

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Opponent Rating Result
William Hart 1172 0 - 1
Michael W Simmons 1167 1 - 0
George Gledhill 1568 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1169 = (3907 + 400 * (1 - 2)) / 3)

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