Event: Division 2

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Opponent	Rating	Result
Chris Snook-Lumb	150	0 - 1
Ian G Kelly	158	0 - 1
Greg Daniel	140	0 - 1
Stuart Wallace	118	1 - 0
Chris Lake	155	0 - 1
Chris C Dunn	131	1 - 0
Simon McDonald	132	1 - 0

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

83 = (984 + 400 * (3 - 4)) / 7)