Event: Northamptonshire Silver King League Division 1

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Opponent	Rating	Result
Tim Broad	1531	½ - ½
Daniel Worley	1546	0 - 1
Kirk Harrison	1641	0 - 1
Paul Young	1631	0 - 1
Tim Broad	1529	½ - ½
Arrow Morris	1628	½ - ½
John Edmundson	1254	1 - 0

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

1423 = (10760 + 400 * (1 - 3)) / 7)