this post was submitted on 23 Oct 2025
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So the traditional answer here is to ask them to point at the door the other guard will say is safe.
However, I'm curious, does anyone know of any other valid solutions?
How is that a valid answer, they would both point at a different door
The liar, knowing the truth-teller will point to the good door, points to the bad door.
The truth-teller, knowing the liar would point to the bad door, points to the bad door.
Either way, you take the one your guard doesn't point to.
But they would have to keep adjusting since they both have to answer acco4ding to what the other one says
no because the question was which door would the other person say is safe, they both point to the not safe door
They will both point to the bad door.
If asking the thruthful guard, he will point to the door the liar says is safe, which would be the bad door. If asking the liar, he would consider what the thruthful guard says is safe, then reverse that answer, still ending up on the bad door.
They cancel out, so whichever guard you ask doesn't matter.
Wouldnt they instead keep pointing like clockwork towards different doors seeing that they would have to adjust for the other guard?
No because them pointing at a door is answering a different question than the one that was posited in the question.
"Is the guard that tells the truth standing in front of the safe door?" If they say yes, you go through their door, if they say no then you go to the other one
I did not think this was going to work. Som bitch it does. Crazy
If they say yes they can still be a liar.
Right, in which case the door they're in front of is the safe door because they lied and said "Yes" when asked if the truth teller is in front of the safe door. And if they tell the truth and say yes, they're still the person in front of the safe door. By asking it that way they make it so it doesn't matter if they're the liar or not. "Yes" means that person's door is safe and "No" means you want the other door, no matter who you ask.
I was thinking: he could lie about the guard but not about the safe door, so he would still be lying. But that's technically a half-truth, which this particular guard isn't capable of. So you're absolutely right, thank you.
That's wild that this works. What.
Could probably do something clever with XOR.
Is exactly one of the following statements true? You are the liar. Your door is the safe door.