Event: County Championship

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Opponent Rating Result
Shabir Okhai 2248 0 - 1
Nikolai Harrison 1619 0 - 1
Elena Cavazzoni 1705 1 - 0
Dragoljub Sudar 1906 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1670 = (7478 + 400 * (1 - 3)) / 4)

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