Event: Durham League Division B

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Opponent Rating Result
Elliott Maitland-Davies 1549 0 - 1
Richard J Harris 1726 0 - 1
Mark Edmundson 1279 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1385 = (4554 + 400 * (1 - 2)) / 3)

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