Event: Division 2

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Opponent Rating Result
Mary Helen Deans 0 0 - 1
Howard Groves 0 0 - 1
Richard Jerram 0 ½ - ½
Chris J Todd 0 0 - 1
Amar Virk 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-160 = (0 + 400 * (1 - 3)) / 5)

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