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Mat: 
 
for some brilliant and witty examples of retrograde analysis, with  
Sherlock Holmes involved, see R. Smullyian, The Chess Mysteries of  
Sherlock Holmes, Oxford Univ. Press 1979 (other editions might exist,  
I am not sure). Maybe it's not pertinent with your problem, but it's a  
great book.   
 
Daniele Besomi 
 
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