Event: Division 2

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Opponent Rating Result
Chris Wescomb 1500 0 - 1
Martyn Colebrook 1472 0 - 1
Samuel Gaffney 1851 0 - 1
David Welsh 1507 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1283 = (6330 + 400 * (0 - 3)) / 4)

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