Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
David P Jones 1356 ½ - ½
Chris J Tuffin 0 0 - 1
Chris Flynn 1589 0 - 1
Diana Vallverdu 1300 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

761 = (4245 + 400 * (0 - 3)) / 4)

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