Event: Durham League Division B

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Opponent Rating Result
Deborah Edmundson 1444 0 - 1
Aaron Gifford 0 ½ - ½
David Pizzi 1100 1 - 0
Barry Edgar 1587 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

933 = (4131 + 400 * (1 - 2)) / 4)

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