Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Diana Vallverdu 1300 1 - 0
Colin R Payne 1593 0 - 1
Mark Philip Baldock 1465 1 - 0
Chris Flynn 1589 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1587 = (5947 + 400 * (2 - 1)) / 4)

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