Event: Division 1

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Opponent Rating Result
Robert Ashworth 1903 1 - 0
Duncan Dicks 2096 0 - 1
Joseph Stewart 2224 0 - 1
Michael Ashworth 2131 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1989 = (8354 + 400 * (1 - 2)) / 4)

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