Event: Division One

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Opponent	Rating	Result
Robert Marks	135	½ - ½
Robert Reynolds	159	½ - ½
Dale Jackson	155	0 - 1
Christopher J Bellin	151	0 - 1
Richard CT Parry	155	0 - 1
Keith R Ingram	168	0 - 1
Gary Haime	153	1 - 0

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

-18 = (1076 + 400 * (1 - 4)) / 7)