This doesn't help the party decide which door to go through at all
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?
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.
How is that a valid answer, they would both point at a different 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?
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
This puzzle is always presented as difficult, but why not just ask a known? If your eyes are brown just ask “Are my eyes brown?” You’d immediately know which one lies or tells the truth.
E: I missed the limit of one question.
Because there are two doors and only one question. If you ask a known question unrelated to the door you find out who the liar is but lose your opportunity to ask them which is the correct door.
The difficulty comes from only being able to ask one question. It's very easy to figure out the liar, but it's much more difficult to figure out the liar and the correct door in the same question
In fact, the lying guard is a red herring. You get one question, and need one piece of info: the door. The canonical question doesn't tell you which guard lies, nor do you care to find out.
Knowing who lies and who tells the truth doesn't tell you which door leads to the prize and which to death.
The first time I encountered a version of this riddle it actually wasn't Labyrinth. It was an old black and white episode of Dr Who aired on PBS when I was a little kid. Same scenario but if I recall, robots instead of guardsmen. I think the good doctor solved the riddle in the typical way of asking one robot what the other would say. I'm looking for it now but I can't find the scene.
Pyramids of Mars
Yes, thank you!! Found the scene itself since the whole serial is apparently on youtube: https://youtu.be/lLBHbt9QYFU?t=5458
Funny how my memory had it in black and white. And I remember the scene being much longer. I watched it when I was like, 9.
Maybe your childhood TV was black and white.
Length, brains just love to add details that dont exist
One question per group. Also now you die because murder.
Barbarian just ripped the head off of one of the guards, you think the other guard is going to be able to arrest them?
"Answer our questions or you're next."
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