Event: Division 2

Opponent Rating Result
Roger Hardy 1810 ½ - ½
Chris J Edwards 1706 0 - 1
Richard Collis 1501 1 - 0
Matthew DJ Wilson 1913 0 - 1
Doug Hewer 1666 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1639 = (8596 + 400 * (1 - 2)) / 5)

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