Event: Chessmaster Challenge 80/10

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Opponent Rating Result
Simon Green 1642 0 - 1
Michael Brant 974 1 - 0
Keith May 1081 1 - 0
Robert J Arthurton 1623 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1330 = (5320 + 400 * (2 - 2)) / 4)

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