Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Lucy Batley 0 0 - 1
David P Jones 1460 1 - 0
Steve Sanders 1600 0 - 1
Benjamin Whalley 1450 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

928 = (4510 + 400 * (1 - 3)) / 4)

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