George Duke wrote on Fri, Jul 9, 2010 08:26 PM UTC:
This #11 board replica is another chess problem by Raymond Smullyan, author 'Chess Mysteries of Sherlock Holmes':
http://www.chessvariants.org/index/displaycomment.php?commentid=23374.
And another Smullyan, http://www.chessvariants.org/index/displaycomment.php?commentid=23389
has solution:
http://www.chessvariants.org/index/displaycomment.php?commentid=23392.