I recently came across this question. It presents a conundrum that it claims to be as-of-yet unsolved by anyone.
Several people did a lot of work and research, and managed to come up with a reasonable, if not verifiable, solution to the puzzle.
It got me thinking: There are myriad famous unsolved puzzles out in the world, that have remained unsolved for years, decades, or even longer. For example:
Now, I don't expect that the patrons of Puzzling.SE are better than all the various experts that have tackled some of these puzzles over the years, but I also think that the users of this site might appreciate being exposed to some of these classic conundrums, if they have not already been.
Hence the question(s):
- Is it appropriate to post famous unsolved puzzles on Puzzling.SE?
- If so, what measures/precautions should be taken to ensure that solvers aren't frustrated by being unable to solve them?
- I assume that it should be made very clear that these are as-of-yet unsolved, and that a solution is not necessarily expected. Are there other things that should be noted?