Event: Gordon Nobbs League

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Opponent	Rating	Result
Robin M Perry	85	1 - 0
Robert G Wilby	137	0 - 1
Michael H Stinton-Brownbridge	153	0 - 1
Michael H Stinton-Brownbridge	153	0 - 1
Paul Green	74	0 - 1
Matthew R Wilson	169	0 - 1
Matthew R Wilson	169	0 - 1
Anthony Tatam	94	0 - 1
Anthony Tatam	94	0 - 1

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

-186 = (1128 + 400 * (1 - 8)) / 9)