Event: Northamptonshire Silver King League

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Opponent	Rating	Result
Arrow Morris	0	0 - 1
Matthew Edwards	1338	1 - 0
Conor Hackett	0	0 - 1
David Caldwell	0	0 - 1
Matthew Edwards	1338	1 - 0

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

455 = (2676 + 400 * (2 - 3)) / 5)