Event: Chessmaster Challenge 80/10

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Opponent Rating Result
Emmanuel Ojo 0 0 - 1
Alan Ward 0 0 - 1
Paul Terry 1720 0 - 1
Alan Wilson 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

30 = (1720 + 400 * (0 - 4)) / 4)

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