Event: WMA Summer League Division 2

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Opponent	Rating	Result
Christopher J Evans	70	1 - 0
James E O'Dell	70	0 - 1
Peter J R Oliver	664	1 - 0
Paul Roper	157	1 - 0
Sam Cotterill	148	0 - 1
John P Wrench	171	0 - 1
Christopher J Evans	70	1 - 0
James E O'Dell	70	0 - 1
Peter J R Oliver	664	1 - 0
Paul Roper	157	1 - 0
Sam Cotterill	148	1 - 0
John P Wrench	171	0 - 1

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

280 = (2560 + 400 * (7 - 5)) / 12)