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Event: Inter

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Opponent Rating Result
Nigel J Kirkman 149 ½ - ½
Matthew C Chen 159 0 - 1
Daniel Knight 133 ½ - ½
Mark Rivlin 139 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-55 = (580 + 400 * (0 - 2)) / 4)

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