Event: Division Two

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Opponent Rating Result
David L Roberts 2058 ½ - ½
Derek R Johnson 1994 0 - 1
Andrew MJ Robbings 2004 ½ - ½
Andrew MJ Robbings 1971 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1907 = (8027 + 400 * (0 - 1)) / 4)

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