Event: u1850 County Championship

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Opponent Rating Result
Robert L Jones 1679 ½ - ½
Colin R Payne 1657 0 - 1
Andrew Maclaren 1755 0 - 1
James Pack 1818 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1427 = (6909 + 400 * (0 - 3)) / 4)

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