Event: Dave Nicholas Summer League

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Opponent Rating Result
Alun Richards 151 0 - 1
Ian Webster 91 1 - 0
Alun Richards 151 0 - 1
Ian Webster 91 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-79 = (484 + 400 * (1 - 3)) / 4)

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