Event: Summer League Division 4

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Opponent Rating Result
Andrew Nettleship 1548 0 - 1
Stephen Gibson 89 0 - 1
Jonny Chatterton 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

412 = (1637 + 400 * (1 - 2)) / 3)

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