Event: Richard Furness(500) League

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Opponent	Rating	Result
Daniel Robinson	1650	1 - 0
Aaron Milne	1278	1 - 0
Mike Selway	1650	1 - 0
Harry Newman	1323	1 - 0
Daniel Robinson	1650	0 - 1
David Somers	1300	1 - 0
Mike Selway	1098	1 - 0

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

1707 = (9949 + 400 * (6 - 1)) / 7)