Event: Cotswold Open

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Opponent	Rating	Result
Duncan Williams	1848	0 - 1
Sean Gordon	1900	0 - 1
Robert M Ashworth	1883	0 - 1
Struan Robertson	1724	0 - 1

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

1439 = (7355 + 400 * (0 - 4)) / 4)