Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Chris Perkins 1659 0 - 1
Heather Enid Walker 1183 0 - 1
Dan Joal Allwin Christopher 0 0 - 1
Kenneth R Ellis 1396 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

660 = (4238 + 400 * (0 - 4)) / 4)

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