Event: Grand Prix 4

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Opponent Rating Result
William F Tracey 0 0 - 1
Michael Hayward 0 ½ - ½
Zacharius Carthew 0 1 - 0
Harry Morter 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-100 = (0 + 400 * (1 - 2)) / 4)

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