Event: Open County Championship

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Opponent Rating Result
Mark Lim 1934 0 - 1
Paul McMahon 1920 1 - 0
Paul R Kemp 1994 0 - 1
Edward Matthewson 1956 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1951 = (7804 + 400 * (2 - 2)) / 4)

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