Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Peter Stone 1663 0 - 1
Dennis G Driscoll 1333 ½ - ½
Heather Enid Walker 1183 1 - 0
Colin R Payne 1641 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1455 = (5820 + 400 * (1 - 1)) / 4)

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