Event: Hillingdon Div 1

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Opponent Rating Result
Manmay Chopra 2215 0 - 1
Sab Jhooti 1854 0 - 1
Mark Winterbotham 1861 1 - 0
Steven F Coles 2028 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1790 = (7958 + 400 * (1 - 3)) / 4)

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