Event: Norfolk and Norwich Championship

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Opponent Rating Result
Stephen LA Orton 2140 0 - 1
Bharath Klass 1726 0 - 1
Slobodan Svircevic 1866 1 - 0
Vivash Samarakoon 2160 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1873 = (7892 + 400 * (1 - 2)) / 4)

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