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A puzzle whose solution relies on external sources such as tables, dictionaries, Wikipedia, or specifics that may not be common knowledge.

3
votes
(Edited to take account of a clue whose significance I hadn't previously realised:) If Nelson did leave a chessboard at the scene of the 5th murder, it might play out like this: The body of another …
answered Jun 5 '16 by Rosie F
3
votes
Fascinating! So far, I've noticed that, in scene 1, and that in scene 2, and that in scene 3 Note that Apropos gcampbell's work Another thing that fits in with gcampbell's work is that …
answered Jun 4 '16 by Rosie F
1
vote
Thanks to another observation by gcampbell, that If Nelson did leave a chessboard at the scene of the 5th murder, it might play out like this: The problem solves as follows:
answered Jun 6 '16 by Rosie F