Event: Division 1

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Opponent Rating Result
Darren J Lewis 1896 ½ - ½
Keith B Cook 1644 ½ - ½
Richard Roberts 1550 1 - 0
David C Chandler 1923 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1853 = (7013 + 400 * (1 - 0)) / 4)

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