Event: Chessmaster Challenge 80/10

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Opponent Rating Result
Calvin Roberts 1216 1 - 0
Robert J Arthurton 1580 0 - 1
Paul Terry 1758 0 - 1
Thomas Bradbrook 1246 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1450 = (5800 + 400 * (2 - 2)) / 4)

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