Event: Derby Club Championship

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Opponent	Rating	Result
David Williams	0	1 - 0
Stuart Marshall	0	0 - 1
Ray J Forey	0	0 - 1
Matthew Caswell	0	0 - 1
Tony O'Donovan	0
Justin Smith	0

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

-200 = (0 + 400 * (1 - 3)) / 4)