Event: Durham League Division B

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Opponent Rating Result
Daniel Williams 1605 0 - 1
Michael Siddle 1512 1 - 0
Deborah Edmundson 1506 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1674 = (4623 + 400 * (2 - 1)) / 3)

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