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How Purdy won: the correspondence chess career of a world champion
The System : A World Champion's Approach to Chess by Hans Berliner (1999, Trade Paperback) for sale online | eBay
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How Purdy Won: The correspondence chess career of a world champion: Purdy, C.J.S. (Author), Larsson, Erik (Foreword): 9780725514396: Amazon.com: Books
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5th World Chess Championship
C. J. S. Purdy: International Master, World Correspondence Chess Champion - His Life, His Games, His Writings: John Hammond, Robert Jamieson, C. J. S. Purdy, Anne Purdy, John Hanks: Amazon.com: Books
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World Championship Game 9: Disaster strikes for Nepo | ChessBase
Game Chess Correspondence Chess High Resolution Stock Photography and Images - Alamy
