Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Andrew Duffell 1581 1 - 0
Colin R Payne 1655 ½ - ½
Arthur Dannatt 1582 ½ - ½
Bharath Klass 1600 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1805 = (6418 + 400 * (2 - 0)) / 4)

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