Event: Five Counties Div 2

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Opponent	Rating	Result
Joseph Morrison	0	0 - 1
Greg J Breed	0	0 - 1
Matthew DH Clark	1857	0 - 1
Rahul Shah	1251	1 - 0
Charlie J Ball	1515	1 - 0

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

845 = (4623 + 400 * (2 - 3)) / 5)