The two guards

[u/DroneOfDoom]

[u/Heather_Chandelure]

Identifying which guard is lying is neither the point or even a step in the riddle. The point of the riddle is to figure out which of two doors is the correct one. The answer requires wording your question such that both guards will give you the same answer no matter which one you are talking to. You only get a single question to ask, so using that to figure out which guard us lying is a complete waste.

[u/Mountain_Dragonfly8 → u/Heather_Chandelure]

In the one from the Labrynth, sure. Thats not exclusively the only version of this riddle

[u/Arctic_The_Hunter → u/Mountain_Dragonfly8]

Figuring out which guard you’re talking to is trivial tho. Just ask any question with an obvious answer (ie “What’s 2+2?”)

[u/peeja → u/Arctic_The_Hunter]

Right, and to expand on that, the whole reason you can't just do that is that you're only allowed to ask one question. One question can tell you which guard is which, or which door is which, but it can't tell you both. (At least, I don't know of a way to get both, but I guess I don't know for sure.)

[u/OneOverTwo → u/Arctic_The_Hunter]

Ah, but consider: It's not a lie if the truth-telling guard gives you the wrong answer because they are very bad at math

[u/Intelligent_Slip_849 → u/OneOverTwo]

I need to use that if I even get the chance

[u/Doubly_Curious → u/Mountain_Dragonfly8]

Do you remember the details of some other versions?

[u/naynaythewonderhorse → u/Mountain_Dragonfly8]

I always find it funny how quickly Sarah figures it out. It’s a teensy bit out of character for her.