Event: Division 1

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Opponent Rating Result
Steve Hunter 1847 ½ - ½
Ana Williams 1890 1 - 0
Keith Aiton 1859 1 - 0
Michael A Naylor-Eade 2052 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2012 = (7648 + 400 * (2 - 1)) / 4)

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