Event: HDCA Summer League Division 1

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Opponent Rating Result
Keith Thompson 162 0 - 1
Graham Chesters 148 0 - 1
Andrew D Bettley 156 ½ - ½
Richard O Callis 145 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-47 = (611 + 400 * (0 - 2)) / 4)

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