Event: Chessmaster Challenge 80/10

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Opponent Rating Result
Keith May 988 1 - 0
Robert J Arthurton 1586 ½ - ½
Andrew T Watson 1401 1 - 0
Paul Rutter 1411 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1647 = (5386 + 400 * (3 - 0)) / 4)

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