Event: Grand Prix 7

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Opponent Rating Result
Jo Carthew 0 0 - 1
Oliver Balp 0 0 - 1
William H Luxton 0 0 - 1
Mike Chapman 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

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

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