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The chess problem used in this book is extremely similar to a problem by Raymond Smullyan appearing in The Chess Mysteries of Sherlock Holmes, with minor changes to fit the plot of the novel that, ironically, make the solution incorrect. Does anyone know anything about this -- particularly, whether Perez-Reverte acknowledged Smullyan in the Spanish original, or indeed, whether he had Smullyan's permission to use his problem? 91.105.43.68 13:05, 9 June 2007 (UTC)
Hi!
Guess it could be useful to know that this picture does exist. Maybe even the historical background is not purely fictitious.
Best regards
Harald —Preceding unsigned comment added by 80.141.238.42 (talk) 20:41, 12 April 2008 (UTC)