Event: Summer League Division 3

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Opponent Rating Result
George Swanson 1653 0 - 1
Eric McKenna 1395 1 - 0
David Burn 1591 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1413 = (4639 + 400 * (1 - 2)) / 3)

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