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Re:The Logic Puzzle You Can Only Solve with Your Brightest F... by n4r9 on Tuesday July 17, 2018 @05:21AM (#17548389)
xkcd calls it the "hardest logic puzzle in the world".

I think this one is a lot harder: http://olivernash.org/2009/10/31/yet-another-prisoner-puzzle...

Re:The Logic Puzzle You Can Only Solve with Your Brightest F... by misterdata on Tuesday July 17, 2018 @05:32AM (#17548433)
Much better explanation by Nick Berry: http://datagenetics.com/blog/december12014/index.html