Event: Lytham Club Championship

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Opponent	Rating	Result
Darren Pickering	0	0 - 1
John Cox	82	1 - 0
Raymond J Pomeroy	109	0 - 1

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

-70 = (191 + 400 * (1 - 2)) / 3)