Event: Division 4

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Opponent Rating Result
Peter F Anderson 1870 ½ - ½
Carl J Hetherington 2009 0 - 1
Mark Croasdale 1656 0 - 1
Hugo Bassa 1719 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1714 = (7254 + 400 * (1 - 2)) / 4)

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