Event: Division 1

Opponent Rating Result
A Clive Walley 1886 1 - 0
Peter Dhonau 2002 1 - 0
Richard Maclannan 1807 0 - 1
Robert Ashworth 1906 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1900 = (7601 + 400 * (2 - 2)) / 4)

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