Event: GP1 - September

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Opponent Rating Result
William H Luxton 1589 0 - 1
Mark Sheehan 0 1 - 0
James Lumsden 1748 0 - 1
Jo Carthew 1559 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1024 = (4896 + 400 * (1 - 3)) / 4)

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