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Nov 14, 2015 at 9:37 comment added Richard Rast It's more a definitional question; what is considered a valid rule of logic, and what is considered guessing?
Apr 11, 2015 at 21:20 comment added user66554 @WendiKidd Can you show me a proof that if there is an unique solution then no backtracking is required? I don't find that intuitively obvious.
May 14, 2014 at 22:12 history edited Kendall Frey CC BY-SA 3.0
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May 14, 2014 at 22:10 comment added WendiKidd Every puzzle with a unique solution is solvable without guessing. If there's more than one solution, that's not necessarily true.
May 14, 2014 at 20:58 history edited Kendall Frey CC BY-SA 3.0
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May 14, 2014 at 20:53 history answered Kendall Frey CC BY-SA 3.0