Event: Durham League Division B

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Opponent Rating Result
Bryan D Harkness 1967 0 - 1
Paul Freeman 1497 1 - 0
Peter Harker 1725 1 - 0
Nigel Hall 1919 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1977 = (7108 + 400 * (3 - 1)) / 4)

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