Event: A Division

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Opponent Rating Result
Joshua Pink 2063 0 - 1
Sarah N Longson 2123 0 - 1
Andy Laurence Coe 1781 ½ - ½
Paul Doherty 1759 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1732 = (7726 + 400 * (0 - 2)) / 4)

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