Event: Open County Championship

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Opponent Rating Result
Adam John 1867 0 - 1
Qais Karimi 1924 1 - 0
Brian R Jeffery 1904 ½ - ½
James Pack 1818 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1778 = (7513 + 400 * (1 - 2)) / 4)

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