Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Benjamin Whalley 1450 1 - 0
John F Weston 1585 ½ - ½
Joseph Grant 1620 1 - 0
Chris Perkins 1659 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1879 = (6314 + 400 * (3 - 0)) / 4)

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