Event: John Davis 6200 League

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Opponent Rating Result
James Lee 1554 0 - 1
Ewan Herd 1622 0 - 1
Joshua Gibbs 1510 0 - 1
David McKee 1567 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1163 = (6253 + 400 * (0 - 4)) / 4)

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