Event: Northamptonshire Silver King League

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Opponent Rating Result
Lucian Durbala 0 1 - 0
John Edmundson 1240 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

620 = (1240 + 400 * (1 - 1)) / 2)

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Opponent Rating Result
Amrik Tahim 1234 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1634 = (1234 + 400 * (1 - 0)) / 1)