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World Championship Game 9: Disaster strikes for Nepo | ChessBase
World Chess Championship - Wikipedia
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How Purdy won: the correspondence chess career of a world champion
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Games of World Correspondence Chess Championships 1-X (Batsford Chess Book): Harting, T. D., Harding, T. D.: 9780713453843: Amazon.com: Books
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A 30 month tournament | ChessBase
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The System: A World Champion's Approach to Chess - Berliner – Chess House
