Event: Richard Furness(500) League

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Opponent Rating Result
Bryan Slater 1550 1 - 0
Ilya Dubov 1700 0 - 1
Lee P Kay 1960 0 - 1
Stephen Harrison 1555 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1491 = (6765 + 400 * (1 - 3)) / 4)

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