Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
John F Weston 1598 ½ - ½
Arthur Dannatt 1582 0 - 1
Heather Enid Walker 1200 1 - 0
Stephen Livermore 1657 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1509 = (6037 + 400 * (1 - 1)) / 4)

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