I’ve only heard it with one question, that’s the whole point. Otherwise you just ask a guard some trivial question (e.g. What color is the sky?) to determine which is the liar, then just ask which is the safe door.
The whole point is to get the information you need from a single question.
I mean, the Barbarian asked the one question and didn’t gain anything from it. Knowing which one is the liar doesn’t… help anymore.
Ah. Normally I see this with no limit on questions. You’re right. It’d only work with at least two questions.
I’ve only heard it with one question, that’s the whole point. Otherwise you just ask a guard some trivial question (e.g. What color is the sky?) to determine which is the liar, then just ask which is the safe door.
The whole point is to get the information you need from a single question.