Event: County Championship

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Opponent Rating Result
Paul A Hutchinson 0 0 - 1
William Pennell 0 ½ - ½
Joe Kilshaw 0 ½ - ½
Francis J Bowers 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-200 = (0 + 400 * (0 - 2)) / 4)

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