Event: Cobham

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Opponent Rating Result
William Flanders 1381 1 - 0
Evan Lam How Yee 0 1 - 0
Maxim Rode 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

860 = (1381 + 400 * (3 - 0)) / 3)

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