Event: SCCA Division 2 19/20

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Opponent Rating Result
Robert W Stephens 144 0 - 1
Mark S Bettley 121 1 - 0
Robert L Jones 146 0 - 1
Andrew J Donnelly 150 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

40 = (561 + 400 * (1 - 2)) / 4)

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