Event: Chessmaster Challenge 80/10

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Opponent Rating Result
Tony Lee 1253 1 - 0
Andrew T Watson 1520 1 - 0
Gary Winson 1601 1 - 0
Robert J Arthurton 1658 0 - 1
Keith May 1119 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1670 = (7151 + 400 * (4 - 1)) / 5)

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