----------------- HES POSTING ----------------- 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 ------------ FOOTER TO HES POSTING ------------ For information, send the message "info HES" to [log in to unmask]