Event: Open County Championship

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Opponent Rating Result
Raymond J Ilett 1929 1 - 0
David E Hall 1943 0 - 1
Adrian MS Matthews 1833 ½ - ½
Francis J Bowers 1843 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1787 = (7548 + 400 * (1 - 2)) / 4)

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