Event: County Championship

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Opponent Rating Result
Francis J Bowers 1855 1 - 0
Joe Kilshaw 1873 0 - 1
Herman FF Kok 0 0 - 1
Paul A Hutchinson 2083 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1253 = (5811 + 400 * (1 - 3)) / 4)

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