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.
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.