Event: u1850 County Championship

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Opponent Rating Result
Ed Kirkham 1741 1 - 0
John E Dolamore 1802 1 - 0
Matthew P Ball 1758 1 - 0
Andrew J Donnelly 1822 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1981 = (7123 + 400 * (3 - 1)) / 4)

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