[CPLX]

One of the main challenges, however, seems like it would rear its head as soon as you leave the confines of a defined brain teaser, where you know for sure that there is a "trick" even if you can't see it, and real world situations such as in programming, where you don't yet know if the specific problem is solvable at all.

[furyofantares]

I noticed something similar when I was studying math: Exercises of the variety "Prove x" or "Disprove x" were much more than twice as easy as exercises of the variety "Prove or disprove x".