Event: County Championship

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Opponent	Rating	Result
Paul A Hutchinson	2083	½ - ½
Francis J Bowers	1855	1 - 0
Joe Kilshaw	1873	½ - ½
Murray D Smith	2188	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

2000 = (7999 + 400 * (1 - 1)) / 4)