Event: Division 1

Opponent Rating Result
David Wells 1893 1 - 0
Simon D Arnold 1980 0 - 1
Paul M Barber 1915 ½ - ½
Ben Williamson 1650 1 - 0
David Wells 1903 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1868 = (9341 + 400 * (2 - 2)) / 5)

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