Event: Open County Championship

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Opponent Rating Result
Paul McMahon 1918 0 - 1
Jan Balogh 2014 0 - 1
James Pack 1897 1 - 0
Paul P Smith 2042 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1968 = (7871 + 400 * (2 - 2)) / 4)

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