Event: Northamptonshire Silver King League

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Opponent Rating Result
Keith A Ball 1593 1 - 0
David P Curran 1716 0 - 1
Vijay Lad 0 0 - 1
Robert Mills 1338 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1162 = (4647 + 400 * (2 - 2)) / 4)

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