Event: GP1 - September

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Opponent Rating Result
Luke Chapman 1873 0 - 1
John James 0 1 - 0
William F Tracey 1635 0 - 1
Harry Morter 1291 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1200 = (4799 + 400 * (2 - 2)) / 4)

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