Event: League Division 1

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Opponent	Rating	Result
Sam Jacklin	1971	0 - 1
Mike R Stokes	1959	½ - ½
David Wells	1856	0 - 1
Daniel J Staples	2064	0 - 1
Peter F Mason	1834	1 - 0
Peter M Gayson	2158	0 - 1
Sam Jacklin	1971	0 - 1

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

1745 = (13813 + 400 * (1 - 5)) / 7)