Event: Worcestershire Championship League

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Opponent	Rating	Result
Gavin Cartwright	1846	½ - ½
Gavin Cartwright	1846	0 - 1
Joseph D Friar	2033	0 - 1
Stephen D Mellor	2045	1 - 0
Brian Turner	1972	0 - 1
John P Wrench	1962	½ - ½
Ray A Collett	1854	1 - 0

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

1880 = (13558 + 400 * (2 - 3)) / 7)