Event: Division 2

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Opponent Rating Result
Peter O'Driscoll 1881 0 - 1
Ben Ellington 1804 1 - 0
Mike J O'Mahony 1782 ½ - ½
Chris Latham 1686 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1688 = (7153 + 400 * (1 - 2)) / 4)

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