Event: Durham League Division 2

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Opponent Rating Result
Daniel Ludlam 0 0 - 1
Geoff Raw 0 1 - 0
Deborah Edmundson 0 1 - 0
Vaughan Davison 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

0 = (0 + 400 * (2 - 2)) / 4)

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