Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Ben Yelverton 1734 0 - 1
Alan L Holmes 1229 1 - 0
David C May 1498 0 - 1
Ed Orchard 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

915 = (4461 + 400 * (1 - 3)) / 4)

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