Event: Super League

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Opponent Rating Result
Michael Ashworth 2121 ½ - ½
Robert Ashworth 1881 1 - 0
Alex Carey 1904 0 - 1
John Jenkins 2012 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1980 = (7918 + 400 * (1 - 1)) / 4)

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