Event: GP1 - September

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Opponent Rating Result
Samuel Merchant 1562 0 - 1
Harry Morter 1291 0 - 1
John James 0 0 - 1
Sharon Merchant 1373 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

657 = (4226 + 400 * (0 - 4)) / 4)

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