Event: Durham League Division B

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Opponent Rating Result
John Reddington 1517 0 - 1
Deborah Edmundson 1444 0 - 1
Mark Edmundson 1306 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1289 = (4267 + 400 * (1 - 2)) / 3)

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