Event: Norfolk County Chess Championships

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Opponent Rating Result
Nigel J Larter 1783 1 - 0
Andrew D Hartland 1869 ½ - ½
Trevor J Ansell 1892 ½ - ½
Paul P Smith 2042 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1997 = (7586 + 400 * (1 - 0)) / 4)

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