Event: Grand Prix 4

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Opponent Rating Result
James Lumsden 0 0 - 1
John Dyer 0 1 - 0
William H Luxton 0 0 - 1
William F Tracey 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-200 = (0 + 400 * (1 - 3)) / 4)

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