Event: Division 2

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Opponent Rating Result
Jake Hung 156 0 - 1
Ian S Comley 146 0 - 1
Susan E Chadwick 111 1 - 0
Paul R Selby 141 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

39 = (554 + 400 * (1 - 2)) / 4)

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