Phrase for a problem that seems impossible, but actually has a simple and obvious solution?


Daniel M. Russell poses what he claims is a deceptively simple brain teaser in his blog:



What short 4-word idiomatic phrase (in English) captures [the] idea of a problem that seems impossible, but actually has a simple and obvious solution?



"Deceptively simple brain teaser" is the best I could come up with, but I don't think it's particularly idiomatic.


UPDATE:


So, the originating blogger has posted his intended answer. I would agree that there was no stand-out candidate amongst all the plausible suggestions, so kudos to all those who found a solution.



Answer



One of the comments on that blog suggests "An egg of Columbus". From the description here, http://en.wikipedia.org/wiki/Egg_of_Columbus, it certainly seems to fit the bill.


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