Event: Derby Club Championship

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Opponent	Rating	Result
Stephen Lamont	0	0 - 1
Andre Cockburn	0	0 - 1
Colin Ross	0	0 - 1
Jacob Godwin	0	0 - 1
Chris Sharp	0
Matthew Caswell	0

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

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