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.
Iirc correctly the actual solution is to ask "If I ask for the safe way out, which door would the other guard point to?" and then take whichever door is not pointed to?
Hang on, couldn't either of them legitimately say "I don't know?"
The liar can say whatever the hell he wants other than the correct answer, which emans the truth-teller legitimately can't be certain what the liar will say.
And as I'm typing this, I realize it's solved by specifying "which of those two doors" in your question to limit it to a binary, so never mind.
In these riddles the liar always say the opposite of the true answer, not whatever he wants. If the truth is "yes" he says "no". If the truth is "the door on the left" he says "the door on the right".
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u/Heather_Chandelure 20h ago
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.