For those who didn't understand: Asking what door the other guard would tell me is safe, always leads to a false answer. If we ask the liar guard ¿What would the other guard say, if i asked wich door is safe? The liar guard would point to the damger door, since the other truthful guard would do the oposite. If we make the same question to the truthful guard, it would answer as the liar, and also point at the danger door. Thus, asking ¿What would the other guard say if we asked wich door is safe? always has the danger door as an answer. This way, we know wich is the danger door, and that the remaining door is the safe one :D I hope this explains it more concisely
I can't! I really can't! People not understanding this even after the explanation just blows my mind away. It literally took me 5mins to solve this. Seems like critical thinking, following simple rules and use of logic is not a thing anymore. You can ONLY ASK 1 question to ONLY 1 of the guards. So, you ask one of the guards (doesn't matter which one) something like: "If I were to ask the other guard which door is the correct one, what would he answer?" If you ask the truth teller, he's gonna tell you the wrong door (because that's what the liar would answer). If you ask the liar, he's also gonna tell you the wrong door (because that's the opposite of what the truth teller would answer). By knowing this, you don't need to ask the question to both guards. You don't even need to know which one is which. Since the outcome is the same in both scenarios, the other door will always be the correct one. Side note: Asking for the wrong door, would also work, in that case you'd pick the same door as the guards. Literally the same, but reversed.
You find a way to make them both say the same answer, IF they do so, then you know it's the opposite. The truth teller will accurately predict which door the liar will say is safe and that is always the danger door, and when that prediction matches you know that the liar was lying and that it's the opposite door. Remember you're not asking them each which door is safe, you're asking them which door they think the other will say is safe. By doing so you know that the truth teller will out the liar by correctly predicting his lie.
The key factor that you omitted is that each guard knows that the other guard will respond in the opposite way. There are actually two ways of asking this question, you can ask about the door that leads to death which will reverse your response based on a yes or no answer. So there are two ways of asking this with 8 possible scenarios.
@@eamonfahey2879 no because they have to lie, if they double bluff or lie about lying they would be telling the truth by default and also second guessing the lie
This puzzle becomes next level when there's only 1 door 1 guard and he lies half the time but you get 3 questions to figure out weather it's currently safe to walk through the door.
By asking any guard what the other would say, you guarantee a lie. Either by asking the liar directly, or by having the honest guard tell you the what the liar would say.
Rules: Guards are identical, although technically this does not matter for our logic, it helps to envision them this way to grasp the set of variables in this equation. Only they know who is the Liar and who is Truth. Only they know who is guarding the passage to paradise. It is not at all guaranteed that the Liar guards hell, nor that Truth-teller guards paradise. You must also basically assume that the Liar intends to see you pick “the bad door” because in the roles of this puzzle, your own role is defined as you intending to pick the “good” door i.e. "Get out of the Dungeon". The conceit of the puzzle is that having a Liar involved at all presents the main conflict for us. We must neutralize this conflict somehow. The goal is not to *fixate* on the liar and figure out who is who; the goal is to formulate a question that *reduces* the odds. A question that makes all the variables "non-randomized" but a better way to state this is, "to make all these variables incriminate the same culprit". Game: Scenario to prove the theory Theory 1 - Honest guard in front of Hell. (To be known as Door U for Undesirable in our process of elimination. The door to paradise will be known as Door Y for YES.) You can’t just ask the Honest-Guard if he’s guarding paradise because you must assume that he could very well be lying. And you can't just ask him "what am I wearing?" or something redundant, because even if you prove that he's a liar, you still haven't proved that he is guarding the door that you need to select. So, here we are, there's two inscrutable guards in front of two indiscernible doors, and I have no choice but to decide randomly who to ask a single question. A. If I end up asking the HONEST guard “what would the other guy tell me to pick” he’d tell me *honestly* that the “other guy” would tell me *dishonestly* to choose his door aka Door U. -- This is logical because he's telling us that the Liar would want us to choose Door U (which both guards know as being Hell, and the Liar is interested in foiling our plans because I guess our enemies hired him to do that). B. If I end up asking the LIAR (still unbeknownst to me his credibility) and ask same question "what would that other guy tell me to pick", he would default to his duty of lying, and tell me *dishonestly* that the other guard would "Pick His own door" aka Door U, again. Theoretically, this is dishonest because all we are allowed to assume via our theory is - that whoever the honest guard is, he would never advise us to pick Door U if we asked him directly. In other words, we need to assume if the honest guard is ever asked "what door should I pick" he will always tell us "the truth" aka technically "our truth" aka "the thing we want" aka Door Y. While we cannot actually prove on-the-spot that the liar is lying, the phrasing of the question against the available facts allows us to eliminate 1 perilous door from our choices, no matter which guard we end up asking. Because the fact that the liar will exclusively provide misinformation is exactly what our clever question is taking advantage of: It's this process of elimination which means that "a second question" is not required. It is true however, that in the reality of this scenario, order to pick the right door, you MUST first ask the question. The question is required because it helps us receive more concrete data, and it's only with that new data can we THEN make our logical deduction. Therefore via the process of elimination which is now possible, you can determine that the other door, aka the only other door in front of you aka Door Y; is your remaining selection. So to summarize; in both instances, Door U is alleged as the door to choose. No matter who I end up posting the question to, in both cases Door U will be alluded to, because in both cases the Liar will be responsible for tainting all the available data, giving you the opposite of what youre searching for. Knowing this, you also deduce that you must choose the opposite door from what is told to you "as conjecture", after asking that question which theoretically forces either of them to acknowledge an opposing factor, and thus both will indicate the exact same door.
Basically the answer is this: the guard that tells the truth would give you the answer of what the other guard would say which is the wrong answer since the other guard is a liar and the one you asked is the truthful one. In essence, he’s giving you the answer of what the other would say. The guard that lies knows the other will tell the truth and since he lies he will give you the wrong answer as well because he’s a liar and that is not what the other guard would say. In conclusion, the answer will always be the opposite of what the guard said, no matter which one you ask.
the fact that you have to ask them what the other guardian would say makes too much sense if you think about it for a while... it's too easy, but not very well known yet.
If they tell you that you can only ask one question, you can solve it in one move by asking one of them "What will the other guard tell me is behind his door if I ask him?" If you are asking the truthful one, it will be the opposite of whatever he reports because the truthful one takes into account that the liar will indeed lie. If you are asking the liar, it will be the opposite of whatever he reports because the liar will give you an inaccurate account of what the truthful one will say. So, if the answer is (bad thing), go through the other guard's door. If the answer is (good thing), go through the door behind the guard you are asking.
How would this question lead you to know which door is the safe option? With this question you only know who is lying and who isn't, and as you only have one question, this doesn't answer which door is safe
@@tigrenaranjo”you can ask one of them only one question” is not violated by asking them to answer two different questions, one each. his solution asking the same question may be more elegant, but mine’s cleaner, and he didn’t state that limitation in the prompt as clearly as when he’s working through it. he arguably violated his own prompt if you’re going to be that pedantic, since he had to ask both guards a question anyway.
@@tigrenaranjoalternatively, you can also figure out the answer to this general riddle with one question if you’re listening carefully and given the prompt by one or both of the guards. the one who says they are guards or guarding a door is 95% the truth-teller unless they’re not actually guarding anything.
@@kazekagekid I think the implication is pretty clear you could only ask one question, to only one guard, to determine which door is safe, and the answer he gives in the video does not violate his rule; he simply demonstrates the answers each guard would give for each scenario to cover the possibilities, and that no matter which guard you ask or which door they are in front of - you only need to ask one of them and always choose the other door as the safe one.
Everyone seems to not realize they give themselves away without needing to ask a question. Let me explain. The first one says "One of us speaks nothing but the truth." This is a true statement so whichever says this is the one who tells the truth. Hence why the liar can only say the statement " The other nothing but lies." This one is calling the other a liar as to still abide by only telling lies. So he is the liar. Simple and easy. just ask the one who told the truth which door is safe.
Just ask 1 guard what’s 2+2 , if he says 4 he’s the truth one . Then ask the other one which door is safe then do the opposite of what he says . Reverse this if the guard lies about 2+2
@@teminilasebikanademola5904 czcams.com/video/HBEEBXsFeRk/video.html This old show does this riddle good (It's only one question, otherwise it's too easy).
@@brianh5878but if the guard answers yes to holding a shield. You now know he tells the truth. Then You can ask the other guard if he’s standing in front of the safe door. If he answers yes; well then you know to go through the other door
Many iterations of this experiment in media make it much simpler. Often times, one of the guards will list off the rules. From that point, you instantly know which is which
Simple solution: Ask “Am I dead?” to one of the guards, if he says yes it’s the liar and ask the other guard which door is safe and go through that one, if he says no, do it again but go through the opposite door
Go up to one guard with three fingers up and say am i holding three fingers up if he says yes then you know hes the honest one, ask the other guard what door is safe and go in the one he doesnt say. Easy
That doesn't work because what if the Honest one is standing in front of the Door to Danger? You figured out who lies and who is honest, but not which doot is safe and which is dangerous as the honest guard can stand in front of danger while the liar can stand in front of safety.
Just seen another short with a solution yesterday. He killed a guard and asked the other if he was still alive, when the dude said no, he knew who the lyer was. It was animated find it on your own
There’s the possibility they’re both a couple of psychopaths who are making it seem like your only way forward is one or the other door, when both actually lead to your demise and you were just supposed to continue down the hall to the exit.
Another problem, what if the guard is lying about the puzzle and both of them are liars? For example if one says “one speaks truth” and the other says “one speaks lies” which is telling the truth, If the one who says “ones speaks truth” is lying then they both lie. What happens then?
Well, the guards never said anything. It was the narrator that set the rules, not them. That argument only works, in the video where you took it from, because the subjects themselves explain the rules. It doesn't really work here.
Ask if one of the guards if the other is dead. If they say yes, they are the liar, if no they are truth. Then ask the other guard which door is safe. Since you know that this one is the liar/truth you should be able to figure this out
there is more than one way to solve this. for example you could ask one guard a question you know the answer to like what what is 1+1=. if he says 2, that means he is telling the truth. that mean the other guard will lie. then ask him what door is safe and the go through the opposite door. Now if he doesn't answer what 1+1= correctly then that means he is the liar. the other guard will tell the truth then go through what ever door he says is safe.
Alternative option... Me *cocks shot gun* "Which is the right door...?" Guardian1: "Ho ho Mortal, surely you jest, you would not dare t--" *bang* kills first door guardian. Me: "You were saying??" Guardian2: "Holy shit! It's the door over there - the one over there!" Me: "Thank you..."
Then you go to the door he pointed and you go throw with confidence thinking its the right door cause you think that killing the other gaurd made the last guard tell the truths. But unfortunately for you, you actually killed the guard that always tell the truths and the one alive must and always tell a lie. So he lied to you and you go to the death door and you die.
@@maxcrayola3074 Guard goes on break...sits on toilet...ppl bust open his toilet taking him away. "Who are you people??!!" The man you killed, had a device in his heart, he instructed us that if he were to die today that we were to take two of you...though I only see one...in any event... welcome to the squid games...
I’ll ask them if I was alive, Depending on their question, I would ask the other guard which door is it and then I’ll go to the door that’s opposite of the yes, or no answer that first person said
You ask 1 guard an absolute fact like: Am I a human? Case 1: Honest Guard : Yes Now i know that this is the honest guard, then the other must tell a lie Go to the other guard, and ask “Will I die if i go behind this door?” Liar Guard will answer yes or no. Make your decision on the opposite of his answer. Case 2: Liar Guard: No Now, i know that this is the liar guard. Go to the other guard, ask Will if die if i go behind this door? He will tell the truth so do as he says. I followed the rule of asking only 1 question to both the guards each
Easy puzzle just ask if i was to ask the other guy what door to go though what would he say. then u just do the opposite of whatever they say since both guards would agree on the wrong answer.
I’m surprised no one figured this out yet….so I’m gonna say it. The guard that says “one of us tells the truth” is lying. The guard that says “one of us tells lies” is telling the truth. No guard is telling the truth but there is at least one that tells nothing but lies. So the answer: they’re both lying.
That’s the catch, you only get the one question. After you figure out who the liar is, you are out of questions and will never know which door is safe.
You only get one question. Ask either guard what the other will say and choose the opposite door. (EDIT: The liar will tell you the truth teller will tell you the opposite of the true door, because they always lie, the truth teller will tell you the liar will tell you the opposite of the true door because they always tell the truth, therefore....)
You dont really ask it. These are the scenarios we are thinking about. So... now that we know the outcomes of the scenarios you can go ask one of them "what door the other guard will point as safe?" And after he answers, you can just go walk in the opposite one :) With this question every time the answer will be the wrong one, always a lie.
Ask one what the right door, and hope that they answer by pointing to the left door. Then correct yourself by saying "no, thats the left door. I asked which one is the right one?"
The question was if you were the other guard what would you say. The truth telling one would say the other guard is safe while the liar would say he’s is safe. That’s in scenario 1 if the truth one is guard the safe path and the lying one is guarding the certain death path. Based on that logic you would not only identify who’s the liar and who’s telling the truth but you would know not to pick the path they both say.
You are wrong. You ask one guard "what would the other guard say is the safe door?" and then you do the opposite of whatever answer you get. Just one question.
@@TheFilipFonky Actually, OP is right. If you listen to the video at 3:00, the narrator clearly says “you have to do the opposite of what they agree on”. But in order to know what the guards agree on, you have to ask 2 questions. So this question is somewhat flawed.
@@tohian the narrator here is implying that they would *theoretically* agree on the same door if asked the same singular question. in other words, you only need the 1 question to prompt them both into giving you the same response meaning no matter who you ask, you can safely assume what the other will say
First off, you could just ask one of them and then pick the other without asking the other guy. Second, u could ask one of them a question with an obvious answer like “what color is the sky” to pick out the liar and then ask the other one which door is safe
@@orion1938yes you do because you find the liar from asking “is the sky blue” and then ask the other one which door is the correct one. If the first guard you ask says the sky isn’t blue you know they are the liar so you can trust the guard you ask about the door and vice versa
@@orion1938as for the video solution, you know that the question you are asking is going to have the same answer for both guards so you only need to ask one guard and then choose the opposite door they say
But I thought only 1 of them could answer you so if only 1 can answer then the other won't say anything to help you figure out which is lying and which isn't
It's still the opposite of the answer whoever you ask. Door 1 = safe, If you ask true guard what the liar guard would say, the liar guard says door 1 is danger; danger being the opposite. If you ask liar guard what door true guard would say, he would lie and claim true guard would say door 1 is danger; danger being the lie. Both answers are door 1 = danger, which is the opposite of what is it. So even though you ask one question you can automatically just do the opposite of the answer.
You don't need to. If you already established that this one tells the truth just ask the other one who you know if a liar which door and just pick the opposite.
You could perhaps ask one of the guards if black is white. If he says “yes”, then he’s the liar and you could ask the other if his door is safe. If he says “no” then you could asking the lying guard if his door is dangerous to you. If he says “yes” you can go through his door, and if he says “no” you go through the other one.
i think the problem assumes you know which guard is the liar and which one tells the truth. the liar can also lie about which door the other guard would tell you, after all the liar is there to lie and mislead you. the truthful guard will tell you which door is dangerous, the lair will tell you which door is 'safe' because the truthful guard will tell you which door is safe in response. why would you assume the liar will give you an honest answer to what the truthful guard will say? for example. if the truthful guard will say the liar will say my door, the liar will say the truthful guard will say my door, why? because he will lie about the other guards answer not just about what door is what even if he can only lie. you didnt ask about his door but the other guards answer. each guard will say either their own door or the other door but never the same door as each other.
I raise my hand and ask, how many fingers I have on this hand, the answer will be 5 for truth and since the other would be telling only lies well he won't be able to say 5.
It's just showing what would happen per scenario. If you asked the liar if his door was safe, (and it waa dangerous) he would say yes. The same would happen to the truthful one.
Nah if you asked "what would you say is the safe door if you were the other gaurd?"it doesn't matter who you asked because they would give you the same answer. Then you just choose the opposite of that answer.
@@natas9967 Guard A always lies and stands before door X. Guard B tells the truth and stands before door Y. You don't know whether X or Y is the good door. The riddle assumes that the truthful guard will point at the good door. If you ask the liying guard what the other guard would choose, he would lie and point at the wrong door. If you ask the truthful guard what the other guard would choose, he would tell you the truth and point at the wrong door. Therefore, no matter which guard you ask, you always get your answer. You choose the other door since both guards will point at the 'bad' door. Hope this helps :)
his asking only one question. the question is "if i ask the other guard which door is safe, what would he say?" and whatever they both agree on you pick the opposite
@Wes & TKP 66-02 Yes it does you just don't get it so let me explain. The best way I can explain it is that you have to ask one guard irl and create the same scenario in your mind but your asking the other guard the same question. That being said you don't know which guard is honest and which guard is a lair. Lets just say you happened to ask the liar irl. So if you ask the lair, "if I ask the other guard which door is safe, what would he say?" The lair knows that the other guard will tell the truth and point to the safe door. So he lies and point to the death door. Now create the same scenario in your mind and picture yourself asking the other guard, "if I ask the other guard which door is safe, what would he say?" The honest guard knows that the lair will pick the death door. So he tells the truth and point to the death door. Both guards in irl and in your mind always agrees and point to the same door. Soooo... All you have to do is pick the opposite of what they agree on.
No it's still one question. What I think you're confused about is everybody, including the video, saying, "what they both agree on" making it sound like you're asking both guards, but you're not...you're just asking one guard (either one) "which door would the other guard pick." Walk that scenario in your head with both guards and it will make sense.
@@shinshalabucht463 it doesn't matter, because you just solved a 1+1 puzzle and can die happy leaving rest of humanity to tackle more complex problems. 😎
Easy add another variable. Ask them if you are not on earth tell me which door leads to safety. The liar is on earth therefore so he will answer. The truthful one cannot answer. That's if you only get one question.
What color is my hair if he says the right answer he telling the truth so i ask the other guard since i know he lies which door is safe if he says the right door then i go in his door and ect.
I put this down below to hopefully help someone understand it. 1ST CIRCUMSTANCE: Honest Knight guards LIFE door, Dishonest Knight guards DEATH door. ONE ALLOWED QUESTION: "What door would the other knight tell me leads to LIFE?" ANSWER (IF ASKING DISHONEST KNIGHT): "My Door." ANSWER (IF ASKING HONEST KNIGHT): "His Door." SOLUTION: No matter which guard you asked, they both indicated the same door that leads to DEATH. Choose the opposite door of either door one indicates to find LIFE. 2ND CIRCUMSTANCE: Dishonest Knight guards LIFE door, Honest Knight guards DEATH door. ONE ALLOWED QUESTION: "What door would the other knight tell me leads to LIFE?" ANSWER (IF ASKING DISHONEST KNIGHT): "His Door." ANSWER (IF ASKING HONEST KNIGHT): "My Door." SOLUTION: Again, no matter which guard you asked, they both indicated the same door that leads to DEATH. Choose the opposite door of either door one indicates to find LIFE. BONUS QUESTION! : Why didn't this work for Sarah in the movie ""Labyrinth" (1986)? BONUS ANSWER: As pointed out by one CZcams commenter, it actually did. They told her one door led to CERTAIN DEATH, while the other door led to the CASTLE AT THE CENTER OF THE LABRYINTH. The door she chose did not lead to CERTAIN DEATH, or she would have certainly died. And although it lead to a hole (with the "Helping Hands" who helped her down) and a dungeon (which Hoggle helped her escape), it did eventually lead to the CASTLE AT THE CENTER OF THE LABRYINTH.
@@samuelfernandesoliveira I just want to know which door is a liar, then I'd leave and come back with someone else and they can ask which door is safe.
i dont see why we need to complicate it with the other guard. can't you just ask any guard "hypothetically speaking, if i asked you which door was safe, which door would you say was safe". the dishonest guard is forced to lie about what he would do (namely lie) and thus give the same answer as the honest guard.
If you ask them "which door would YOU say is safe" directly, the will give you crossed answers, the liar would lie and point you to the danger door (saying that is safe), and the honest guard would point at the real safe door, they would not point to the same door and you still don't know who is the honest one. Instead you should ask a crossed question like "What door would the other guard say is the safe door" The Liar Guard would lie telling you that the other guard would say that the X's door is safe (when is actually the danger door) The Honest Guard would tell you that the other guard would lie and tell you that the X's door is safe (pointing you to the Danger Door) Thus both of them would point you to the danger door, and you go to the opposite door which is the safe one
@@gabrielruiz4580 if the liar would point to the danger door i asked which is safe, then if i ask "which door would you point to IF i asked you which door was safe" then they would have to lie about what they would do and then point to the safe door.
Let p be the answer to the question from guards Let ' be false guard modified answer Which door is safe?: p' and p = 0 What would other tell about safe door: (p)' and (p') = p' Correct way is (p')' meaning p
there is a problem with all of this... the riddle never stated they guards will answer the question within the rules we are given Say I am the Lier. you ask me what my counter part will answer with and I can now say "Up your butt" or "Inside the rabbit's nose" These are lies claiming the door is else where. but even if you try and counter this by trying to be specidic I can still lie about it being on the ceiling or lying about a third door. Counter method is very simple. Force one through a door and listen for the danger behind the door if the guard is killed then you know that door is not the real one and thus go through the other. You can also call out your question to the one behind the door if they are okay and in a safe area. Since each of these door ideas come with the pain being instant you can use the death of a guard to complete the riddle. This is called thinking outside the rules place before you aka loopholes.
"barbarian takes axe and kills first guard" "is he dead?"
U came from that video too?
@@copycruel we are sheep fr
Now you don't know what door is safe.
"No"
"This one liar"
In this video the situation is stated that u can only ask 1 question
You dont ask the guards about what is behind them, you ask them about what is behind you.
But then you don’t know which door is the death door and life door
@@Just_Call_Me_Aurora you must first determine which one lies, then you can ask about the door
@@RandomFandom1 the whole point of the riddle is you can only ask them both one question.
For those who didn't understand: Asking what door the other guard would tell me is safe, always leads to a false answer. If we ask the liar guard ¿What would the other guard say, if i asked wich door is safe? The liar guard would point to the damger door, since the other truthful guard would do the oposite. If we make the same question to the truthful guard, it would answer as the liar, and also point at the danger door. Thus, asking ¿What would the other guard say if we asked wich door is safe? always has the danger door as an answer. This way, we know wich is the danger door, and that the remaining door is the safe one :D I hope this explains it more concisely
This was very helpful. Usually I can never understand this riddle, but this helped me understand it.
Sometimes I need shit explained to me like I'm a newborn.
I can't! I really can't! People not understanding this even after the explanation just blows my mind away.
It literally took me 5mins to solve this. Seems like critical thinking, following simple rules and use of logic is not a thing anymore.
You can ONLY ASK 1 question to ONLY 1 of the guards.
So, you ask one of the guards (doesn't matter which one) something like: "If I were to ask the other guard which door is the correct one, what would he answer?"
If you ask the truth teller, he's gonna tell you the wrong door (because that's what the liar would answer).
If you ask the liar, he's also gonna tell you the wrong door (because that's the opposite of what the truth teller would answer).
By knowing this, you don't need to ask the question to both guards. You don't even need to know which one is which.
Since the outcome is the same in both scenarios, the other door will always be the correct one.
Side note: Asking for the wrong door, would also work, in that case you'd pick the same door as the guards. Literally the same, but reversed.
I doubt I’ll ever wrap my head around this conundrum. Thanks a lot Ricky, Steve, and Karl.
😂..feel the door to see if its hot
Look lads ive got some post for God here
@@domatron1578 😆😆😆😆😆
@@domatron1578 a moronic genius
You find a way to make them both say the same answer, IF they do so, then you know it's the opposite. The truth teller will accurately predict which door the liar will say is safe and that is always the danger door, and when that prediction matches you know that the liar was lying and that it's the opposite door.
Remember you're not asking them each which door is safe, you're asking them which door they think the other will say is safe. By doing so you know that the truth teller will out the liar by correctly predicting his lie.
if i ended up in that situation... i'll just go home and won't bother those guards :)
*You are literally in prison, stupid. Your only way HOME is through the door!*
Its really easy if you get the jist of it, alternatively you can kill them both but that would not be very nice to mr. honest.
The key factor that you omitted is that each guard knows that the other guard will respond in the opposite way. There are actually two ways of asking this question, you can ask about the door that leads to death which will reverse your response based on a yes or no answer. So there are two ways of asking this with 8 possible scenarios.
are you saying that the Liar would actually double-bluff?
@@eamonfahey2879 no because they have to lie, if they double bluff or lie about lying they would be telling the truth by default and also second guessing the lie
@@josephrusso4748 yes true. I get what youre saying now. One can either ask re: the door to heaven, or you can ask re: the door to hell.
This puzzle becomes next level when there's only 1 door 1 guard and he lies half the time but you get 3 questions to figure out weather it's currently safe to walk through the door.
Does it like change to a dangerous one as soon as he lies?
He's playing this game on very hard mode 😅 I'll definitively give it a think ¿Do you have a solution? If you do, hats off 🎩
😪 i still cannot understand
By asking any guard what the other would say, you guarantee a lie. Either by asking the liar directly, or by having the honest guard tell you the what the liar would say.
Rules:
Guards are identical, although technically this does not matter for our logic, it helps to envision them this way to grasp the set of variables in this equation.
Only they know who is the Liar and who is Truth. Only they know who is guarding the passage to paradise.
It is not at all guaranteed that the Liar guards hell, nor that Truth-teller guards paradise.
You must also basically assume that the Liar intends to see you pick “the bad door” because in the roles of this puzzle, your own role is defined as you intending to pick the “good” door i.e. "Get out of the Dungeon". The conceit of the puzzle is that having a Liar involved at all presents the main conflict for us. We must neutralize this conflict somehow.
The goal is not to *fixate* on the liar and figure out who is who; the goal is to formulate a question that *reduces* the odds. A question that makes all the variables "non-randomized" but a better way to state this is, "to make all these variables incriminate the same culprit".
Game:
Scenario to prove the theory
Theory 1 - Honest guard in front of Hell. (To be known as Door U for Undesirable in our process of elimination. The door to paradise will be known as Door Y for YES.)
You can’t just ask the Honest-Guard if he’s guarding paradise because you must assume that he could very well be lying.
And you can't just ask him "what am I wearing?" or something redundant, because even if you prove that he's a liar, you still haven't proved that he is guarding the door that you need to select.
So, here we are, there's two inscrutable guards in front of two indiscernible doors, and I have no choice but to decide randomly who to ask a single question.
A. If I end up asking the HONEST guard “what would the other guy tell me to pick” he’d tell me *honestly* that the “other guy” would tell me *dishonestly* to choose his door aka Door U. -- This is logical because he's telling us that the Liar would want us to choose Door U (which both guards know as being Hell, and the Liar is interested in foiling our plans because I guess our enemies hired him to do that).
B. If I end up asking the LIAR (still unbeknownst to me his credibility) and ask same question "what would that other guy tell me to pick", he would default to his duty of lying, and tell me *dishonestly* that the other guard would "Pick His own door" aka Door U, again. Theoretically, this is dishonest because all we are allowed to assume via our theory is - that whoever the honest guard is, he would never advise us to pick Door U if we asked him directly. In other words, we need to assume if the honest guard is ever asked "what door should I pick" he will always tell us "the truth" aka technically "our truth" aka "the thing we want" aka Door Y.
While we cannot actually prove on-the-spot that the liar is lying, the phrasing of the question against the available facts allows us to eliminate 1 perilous door from our choices, no matter which guard we end up asking. Because the fact that the liar will exclusively provide misinformation is exactly what our clever question is taking advantage of: It's this process of elimination which means that "a second question" is not required. It is true however, that in the reality of this scenario, order to pick the right door, you MUST first ask the question. The question is required because it helps us receive more concrete data, and it's only with that new data can we THEN make our logical deduction. Therefore via the process of elimination which is now possible, you can determine that the other door, aka the only other door in front of you aka Door Y; is your remaining selection.
So to summarize; in both instances, Door U is alleged as the door to choose. No matter who I end up posting the question to, in both cases Door U will be alluded to, because in both cases the Liar will be responsible for tainting all the available data, giving you the opposite of what youre searching for. Knowing this, you also deduce that you must choose the opposite door from what is told to you "as conjecture", after asking that question which theoretically forces either of them to acknowledge an opposing factor, and thus both will indicate the exact same door.
@@eamonfahey2879 what a deep explanation, thanks bro!
@@eskailerwhite.7593 i was stuck on this for a while myself so I understood your pain and wanted to alleviate the suffering if possible
Basically the answer is this: the guard that tells the truth would give you the answer of what the other guard would say which is the wrong answer since the other guard is a liar and the one you asked is the truthful one. In essence, he’s giving you the answer of what the other would say.
The guard that lies knows the other will tell the truth and since he lies he will give you the wrong answer as well because he’s a liar and that is not what the other guard would say.
In conclusion, the answer will always be the opposite of what the guard said, no matter which one you ask.
"what color is my hair" done
You only get one question
@infinitevoid227 *They would both answer the question tho? That's literally the entire point of the riddle!*
He's right I'm wrong, they answer the question and I now know who the liar is but have no idea which door is safe
@RitsuSakuma69 yes but even though you've found the liar you can no longer ask about the doors
The point isn’t to figure out which one lies it’s to figure out which door is safe
the fact that you have to ask them what the other guardian would say makes too much sense if you think about it for a while... it's too easy, but not very well known yet.
*points at the other guard* "Is he a guard?"
You kill one guard and then ask the other if the dead guard is died
Whoever explains the rules is the honest one. And will get you to safety.
I have 100 luck. I'll just toss a coin.
Thanks you! The illustration really helped.
Chuck Norris would hit them with so many rights, they would beg for a left. And then tell him which was the safe door. Lol.
If they tell you that you can only ask one question, you can solve it in one move by asking one of them "What will the other guard tell me is behind his door if I ask him?" If you are asking the truthful one, it will be the opposite of whatever he reports because the truthful one takes into account that the liar will indeed lie. If you are asking the liar, it will be the opposite of whatever he reports because the liar will give you an inaccurate account of what the truthful one will say. So, if the answer is (bad thing), go through the other guard's door. If the answer is (good thing), go through the door behind the guard you are asking.
“Are you a guard?”
How would this question lead you to know which door is the safe option? With this question you only know who is lying and who isn't, and as you only have one question, this doesn't answer which door is safe
@@tigrenaranjo”you can ask one of them only one question” is not violated by asking them to answer two different questions, one each. his solution asking the same question may be more elegant, but mine’s cleaner, and he didn’t state that limitation in the prompt as clearly as when he’s working through it. he arguably violated his own prompt if you’re going to be that pedantic, since he had to ask both guards a question anyway.
@@tigrenaranjoalternatively, you can also figure out the answer to this general riddle with one question if you’re listening carefully and given the prompt by one or both of the guards. the one who says they are guards or guarding a door is 95% the truth-teller unless they’re not actually guarding anything.
@@kazekagekid I think the implication is pretty clear you could only ask one question, to only one guard, to determine which door is safe, and the answer he gives in the video does not violate his rule; he simply demonstrates the answers each guard would give for each scenario to cover the possibilities, and that no matter which guard you ask or which door they are in front of - you only need to ask one of them and always choose the other door as the safe one.
@@kaptainkittens583 “you can ask one of them only one question” 0:37
I like how Rick and Morty solved this 😂😂😂
Thats why i came here lol
Everyone seems to not realize they give themselves away without needing to ask a question. Let me explain.
The first one says "One of us speaks nothing but the truth." This is a true statement so whichever says this is the one who tells the truth.
Hence why the liar can only say the statement " The other nothing but lies." This one is calling the other a liar as to still abide by only telling lies. So he is the liar.
Simple and easy.
just ask the one who told the truth which door is safe.
*GRABS AXE WITH MACLLIOUS INTENT*
Tell/order them both to point at the safe door so it doesn’t count as a question the ask one of the how many fingers your holding up
This seems brilliant I just hope the two guards will take orders from a stranger! 😂
Just ask 1 guard what’s 2+2 , if he says 4 he’s the truth one . Then ask the other one which door is safe then do the opposite of what he says . Reverse this if the guard lies about 2+2
You're only allowed one question, though.
@@ToaRahkshi I thought it was 1 question for each of them ?
@@teminilasebikanademola5904 czcams.com/video/HBEEBXsFeRk/video.html
This old show does this riddle good (It's only one question, otherwise it's too easy).
If the liar is expected to lie, then wouldn't his sudden telling the truth actually be a lie?
"Did you sleep with his wife?"
just ask him if hes holding a shiled lol
That would let you know who’s lying but you wouldn’t know if he was standing in front of the death door or safe door
@@brianh5878but if the guard answers yes to holding a shield. You now know he tells the truth. Then You can ask the other guard if he’s standing in front of the safe door. If he answers yes; well then you know to go through the other door
@@peris_arts_film9699You can only ask one question.
@@peris_arts_film9699 1 question only is the game
@@eamonfahey2879 aight fine. Bring a friend
Many iterations of this experiment in media make it much simpler. Often times, one of the guards will list off the rules. From that point, you instantly know which is which
Anyone else get "Labyrinth" flashbacks? 😂
Simple solution: Ask “Am I dead?” to one of the guards, if he says yes it’s the liar and ask the other guard which door is safe and go through that one, if he says no, do it again but go through the opposite door
You only get one question for both guards.
Go up to one guard with three fingers up and say am i holding three fingers up if he says yes then you know hes the honest one, ask the other guard what door is safe and go in the one he doesnt say. Easy
That doesn't work because what if the Honest one is standing in front of the Door to Danger? You figured out who lies and who is honest, but not which doot is safe and which is dangerous as the honest guard can stand in front of danger while the liar can stand in front of safety.
_"You can ask _*_one_*_ of them only, _*_one_*_ question."_
Just seen another short with a solution yesterday. He killed a guard and asked the other if he was still alive, when the dude said no, he knew who the lyer was. It was animated find it on your own
you now know who's the liar but you don't know which door is safe and you're out of questions
There’s the possibility they’re both a couple of psychopaths who are making it seem like your only way forward is one or the other door, when both actually lead to your demise and you were just supposed to continue down the hall to the exit.
Third option. Go through a door at a 50/50 option
WhAt CoLoR iS tHe SkY
don't ask a question, just go to one door, open it and push the guard through. If you hear screams of death then that was the danger door.
Another problem, what if the guard is lying about the puzzle and both of them are liars?
For example if one says “one speaks truth” and the other says “one speaks lies” which is telling the truth,
If the one who says “ones speaks truth” is lying then they both lie.
What happens then?
Well, the guards never said anything. It was the narrator that set the rules, not them.
That argument only works, in the video where you took it from, because the subjects themselves explain the rules.
It doesn't really work here.
I thought the puzzle allows only one question to only one guard. You're not supposed to be able to cross check the result against the other guard.
Ask if one of the guards if the other is dead. If they say yes, they are the liar, if no they are truth. Then ask the other guard which door is safe. Since you know that this one is the liar/truth you should be able to figure this out
you only get one question remember
lets assume this is a real scenario
"is the other guard dead?"
yes: he is the liar
no: he is NOT the liar
there is more than one way to solve this. for example you could ask one guard a question you know the answer to like what what is 1+1=. if he says 2, that means he is telling the truth. that mean the other guard will lie. then ask him what door is safe and the go through the opposite door. Now if he doesn't answer what 1+1= correctly then that means he is the liar. the other guard will tell the truth then go through what ever door he says is safe.
You can ask ONE of them only. As much as 1+1 is a question, you cannot go to the other guard and ask if the door is safe.
Alternative option...
Me *cocks shot gun*
"Which is the right door...?"
Guardian1: "Ho ho Mortal, surely you jest, you would not dare t--" *bang* kills first door guardian.
Me: "You were saying??"
Guardian2: "Holy shit! It's the door over there - the one over there!"
Me: "Thank you..."
Then you go to the door he pointed and you go throw with confidence thinking its the right door cause you think that killing the other gaurd made the last guard tell the truths. But unfortunately for you, you actually killed the guard that always tell the truths and the one alive must and always tell a lie. So he lied to you and you go to the death door and you die.
@@maxcrayola3074 Guard goes on break...sits on toilet...ppl bust open his toilet taking him away.
"Who are you people??!!"
The man you killed, had a device in his heart, he instructed us that if he were to die today that we were to take two of you...though I only see one...in any event... welcome to the squid games...
Another alternative: physically hurt them in some way then ask if it hurts
@@jsc1jake512 That tells you who the liar is, but not which door is safe.
You: enters
Guardian2:.... Hehe sucker
I’ll ask them if I was alive, Depending on their question, I would ask the other guard which door is it and then I’ll go to the door that’s opposite of the yes, or no answer that first person said
You ask 1 guard an absolute fact like: Am I a human?
Case 1:
Honest Guard : Yes
Now i know that this is the honest guard, then the other must tell a lie
Go to the other guard, and ask “Will I die if i go behind this door?”
Liar Guard will answer yes or no. Make your decision on the opposite of his answer.
Case 2:
Liar Guard: No
Now, i know that this is the liar guard.
Go to the other guard, ask Will if die if i go behind this door?
He will tell the truth so do as he says.
I followed the rule of asking only 1 question to both the guards each
_"You can ask _*_one_*_ of them only, _*_one_*_ question."_
The answer stab one ask them if that hurt. Depending one the answer depends on which is which bang easy
I would just ask one of them wich way is left
Easy puzzle just ask if i was to ask the other guy what door to go though what would he say. then u just do the opposite of whatever they say since both guards would agree on the wrong answer.
I’m surprised no one figured this out yet….so I’m gonna say it.
The guard that says “one of us tells the truth” is lying.
The guard that says “one of us tells lies” is telling the truth.
No guard is telling the truth but there is at least one that tells nothing but lies.
So the answer: they’re both lying.
What color is my red cloak. Truth guard: red, Lying Guard: blue. Me: Wow that was easy.
and then what? you still need to find the correct door and you only get one question.
Still dont understand. I need a flow chart to understand
How many fingers am I holding up if one says the right number than its the truth but if the other says the wrong number then he lies
But what if the truth teller is guarding the death door?
That’s the catch, you only get the one question. After you figure out who the liar is, you are out of questions and will never know which door is safe.
Well can’t you ask the other one the question
@@TheJM5 nope only one question for one guard. It’d be too easy otherwise
@@infinitevoid227 that’s stupid then how do I know who’s lying
You can ask the second guard if he's wearing armor, Once you know who's the liar go ask the first one the door question.
You only get one question
@@sadoo0797 It seems the video doesn't respect so why should I?
@@maximized_1 how does the video not respect this?
@@sadoo0797 He said to ask the guard "What is the other guard gonna respond?" Then you'd go to the other guard and ask him which door is good
@@maximized_1 ah…. I see no you’re wrong about that…. I can attempt to explain it to you but wording this might be hard without any visual aide
It's easy touch the knight and ask if your touching him.
Ask the guards if I approached from that direction. Essentially a conversation about details everyone witnessed. Even your hair color.
You only get one question. Ask either guard what the other will say and choose the opposite door.
(EDIT: The liar will tell you the truth teller will tell you the opposite of the true door, because they always lie, the truth teller will tell you the liar will tell you the opposite of the true door because they always tell the truth, therefore....)
They both pick the bad door
But if you can only ask one question how can you ask one guard and then the other? It is the SAME question but you ask it two times.
You dont really ask it. These are the scenarios we are thinking about. So... now that we know the outcomes of the scenarios you can go ask one of them "what door the other guard will point as safe?" And after he answers, you can just go walk in the opposite one :) With this question every time the answer will be the wrong one, always a lie.
@@gespi79This assumes that the guards know each others intentions to truthtell/lie
@123Mathzak True. But Domnoidragon's question is about something else
Heres ny awnser, ask both of them did you just rause you hand, thats a lot easier
Ask one what the right door, and hope that they answer by pointing to the left door. Then correct yourself by saying "no, thats the left door. I asked which one is the right one?"
Are you sleeping with the other guard's lover?
But you can only ask 1 question, so how can you know what they both agree on?
The question was if you were the other guard what would you say. The truth telling one would say the other guard is safe while the liar would say he’s is safe. That’s in scenario 1 if the truth one is guard the safe path and the lying one is guarding the certain death path. Based on that logic you would not only identify who’s the liar and who’s telling the truth but you would know not to pick the path they both say.
in the end you still asked two questions... am I wrong?
You are wrong. You ask one guard "what would the other guard say is the safe door?" and then you do the opposite of whatever answer you get. Just one question.
@@TheFilipFonky
Actually, OP is right. If you listen to the video at 3:00, the narrator clearly says “you have to do the opposite of what they agree on”. But in order to know what the guards agree on, you have to ask 2 questions. So this question is somewhat flawed.
@@tohian the narrator here is implying that they would *theoretically* agree on the same door if asked the same singular question. in other words, you only need the 1 question to prompt them both into giving you the same response meaning no matter who you ask, you can safely assume what the other will say
@@tohian it's not. They would always agree on the same door.
They would both answer at the same time but you still get the right answer, so it's one question.
Would it work if said my name is_______ and asked if " ________ was my name"?
I wondered cause it 1 question and an answer you definitely know
First off, you could just ask one of them and then pick the other without asking the other guy. Second, u could ask one of them a question with an obvious answer like “what color is the sky” to pick out the liar and then ask the other one which door is safe
But you still do not know which door is safe and which is not.
@@orion1938yes you do because you find the liar from asking “is the sky blue” and then ask the other one which door is the correct one. If the first guard you ask says the sky isn’t blue you know they are the liar so you can trust the guard you ask about the door and vice versa
@@orion1938as for the video solution, you know that the question you are asking is going to have the same answer for both guards so you only need to ask one guard and then choose the opposite door they say
@@conman570no because you can only ask 1 question in this scenario, not 1 each guard.
@@Hendrickx.. the video says you can ask two but even so ask I explained you are able to do it with only one question as well
But I thought only 1 of them could answer you so if only 1 can answer then the other won't say anything to help you figure out which is lying and which isn't
It's still the opposite of the answer whoever you ask. Door 1 = safe, If you ask true guard what the liar guard would say, the liar guard says door 1 is danger; danger being the opposite. If you ask liar guard what door true guard would say, he would lie and claim true guard would say door 1 is danger; danger being the lie. Both answers are door 1 = danger, which is the opposite of what is it. So even though you ask one question you can automatically just do the opposite of the answer.
So what do you do if both guards are liars?
Both guards can't be liers
Iiars
Hold your hand up and ask "Is this my hand?". If he says yes, ask him which door to go through. If he says no, consult the other guard.
You only get one question.
You don't need to. If you already established that this one tells the truth just ask the other one who you know if a liar which door and just pick the opposite.
@@Guldivery What part of "you only get one question?" do you not understand?
@@Dharengo per guard
@@Guldivery No, it's one question period.
You could perhaps ask one of the guards if black is white. If he says “yes”, then he’s the liar and you could ask the other if his door is safe. If he says “no” then you could asking the lying guard if his door is dangerous to you. If he says “yes” you can go through his door, and if he says “no” you go through the other one.
only one question allowed.
@@ToaRahkshi Then I guess I’m falling to my doom.
i think the problem assumes you know which guard is the liar and which one tells the truth. the liar can also lie about which door the other guard would tell you, after all the liar is there to lie and mislead you.
the truthful guard will tell you which door is dangerous, the lair will tell you which door is 'safe' because the truthful guard will tell you which door is safe in response.
why would you assume the liar will give you an honest answer to what the truthful guard will say? for example.
if the truthful guard will say the liar will say my door, the liar will say the truthful guard will say my door, why? because he will lie about the other guards answer not just about what door is what even if he can only lie. you didnt ask about his door but the other guards answer. each guard will say either their own door or the other door but never the same door as each other.
I raise my hand and ask, how many fingers I have on this hand, the answer will be 5 for truth and since the other would be telling only lies well he won't be able to say 5.
Or you just ask the a question you already know the answer to.
Just ask them the wall color bruh
one if he is liaing and the ather what dor is safe
Just point up than ask if you pointed up
I thought you could only ask one question between the two of them, not one question for each guard?
It's just showing what would happen per scenario. If you asked the liar if his door was safe, (and it waa dangerous) he would say yes. The same would happen to the truthful one.
If you ask the wrong guard first you're screwed.
Nah if you asked "what would you say is the safe door if you were the other gaurd?"it doesn't matter who you asked because they would give you the same answer. Then you just choose the opposite of that answer.
@@aldobanuelos6614 reading that hurts.. I am still lost.
@@natas9967 Guard A always lies and stands before door X. Guard B tells the truth and stands before door Y. You don't know whether X or Y is the good door.
The riddle assumes that the truthful guard will point at the good door.
If you ask the liying guard what the other guard would choose, he would lie and point at the wrong door.
If you ask the truthful guard what the other guard would choose, he would tell you the truth and point at the wrong door.
Therefore, no matter which guard you ask, you always get your answer. You choose the other door since both guards will point at the 'bad' door.
Hope this helps :)
Just ask a yes or no question💀
I don't get it.
It still doesn’t make sense to me
This is the question I’d ask in this scenario;
“If I were to ask the other guard which door is the wrong door, what would he say?”
How is your question different from the one in the video?
I thought you can only ask one question, period. Not one question to each guard, for a total of two questions.
What if we ask them the rules of the game ? We already know the rules therefore only one door will be right.
Ask one about something you know and you will know if he tells the true or lies
What gender is the other guard
Am I waving at you
1 question , your asking more than 1
his asking only one question. the question is "if i ask the other guard which door is safe, what would he say?"
and whatever they both agree on you pick the opposite
@Wes & TKP 66-02 Yes it does you just don't get it so let me explain. The best way I can explain it is that you have to ask one guard irl and create the same scenario in your mind but your asking the other guard the same question.
That being said you don't know which guard is honest and which guard is a lair.
Lets just say you happened to ask the liar irl. So if you ask the lair, "if I ask the other guard which door is safe, what would he say?" The lair knows that the other guard will tell the truth and point to the safe door. So he lies
and point to the death door.
Now create the same scenario in your mind and picture yourself asking the other guard, "if I ask the other guard which door is safe, what would he say?" The honest guard knows that the lair will pick the death door. So he tells the
truth and point to the death door.
Both guards in irl and in your mind always agrees and point to the same door.
Soooo... All you have to do is pick the opposite of what they agree on.
No it's still one question. What I think you're confused about is everybody, including the video, saying, "what they both agree on" making it sound like you're asking both guards, but you're not...you're just asking one guard (either one) "which door would the other guard pick."
Walk that scenario in your head with both guards and it will make sense.
Certain death for me 🥵🔥💀
what if you just asked a simple math question like whats 1+1
the honest gaurd will say 2 and the liar will say any other number
Then how would you know which door to go to
@@shinshalabucht463 it doesn't matter, because you just solved a 1+1 puzzle and can die happy leaving rest of humanity to tackle more complex problems. 😎
Easy add another variable. Ask them if you are not on earth tell me which door leads to safety. The liar is on earth therefore so he will answer. The truthful one cannot answer. That's if you only get one question.
What color is my hair if he says the right answer he telling the truth so i ask the other guard since i know he lies which door is safe if he says the right door then i go in his door and ect.
Stop mleming 😂
and i though i just have one question and just one can answer.... no wonder i couldnt figger this one out... i feel so stupid...
simple: open one of the doors and see if it leads outside or not.
why is everyone coming up with all these smartass solutions. just look!
I put this down below to hopefully help someone understand it.
1ST CIRCUMSTANCE: Honest Knight guards LIFE door, Dishonest Knight guards DEATH door.
ONE ALLOWED QUESTION: "What door would the other knight tell me leads to LIFE?"
ANSWER (IF ASKING DISHONEST KNIGHT): "My Door."
ANSWER (IF ASKING HONEST KNIGHT): "His Door."
SOLUTION: No matter which guard you asked, they both indicated the same door that leads to DEATH. Choose the opposite door of either door one indicates to find LIFE.
2ND CIRCUMSTANCE: Dishonest Knight guards LIFE door, Honest Knight guards DEATH door.
ONE ALLOWED QUESTION: "What door would the other knight tell me leads to LIFE?"
ANSWER (IF ASKING DISHONEST KNIGHT): "His Door."
ANSWER (IF ASKING HONEST KNIGHT): "My Door."
SOLUTION: Again, no matter which guard you asked, they both indicated the same door that leads to DEATH. Choose the opposite door of either door one indicates to find LIFE.
BONUS QUESTION! : Why didn't this work for Sarah in the movie ""Labyrinth" (1986)?
BONUS ANSWER: As pointed out by one CZcams commenter, it actually did. They told her one door led to CERTAIN DEATH, while the other door led to the CASTLE AT THE CENTER OF THE LABRYINTH. The door she chose did not lead to CERTAIN DEATH, or she would have certainly died. And although it lead to a hole (with the "Helping Hands" who helped her down) and a dungeon (which Hoggle helped her escape), it did eventually lead to the CASTLE AT THE CENTER OF THE LABRYINTH.
Couldn't you just ask any question you know to be untrue for example: does 2 plus 2 = 5? 0:11
The problem is knowing if thr door is safe tho
@@samuelfernandesoliveira I just want to know which door is a liar, then I'd leave and come back with someone else and they can ask which door is safe.
@@jacobcarter2992 as much as it's easy like that, that's not the point though..
i dont see why we need to complicate it with the other guard. can't you just ask any guard "hypothetically speaking, if i asked you which door was safe, which door would you say was safe". the dishonest guard is forced to lie about what he would do (namely lie) and thus give the same answer as the honest guard.
If you ask them "which door would YOU say is safe" directly, the will give you crossed answers, the liar would lie and point you to the danger door (saying that is safe), and the honest guard would point at the real safe door, they would not point to the same door and you still don't know who is the honest one.
Instead you should ask a crossed question like "What door would the other guard say is the safe door"
The Liar Guard would lie telling you that the other guard would say that the X's door is safe (when is actually the danger door)
The Honest Guard would tell you that the other guard would lie and tell you that the X's door is safe (pointing you to the Danger Door)
Thus both of them would point you to the danger door, and you go to the opposite door which is the safe one
@@gabrielruiz4580 if the liar would point to the danger door i asked which is safe, then if i ask "which door would you point to IF i asked you which door was safe" then they would have to lie about what they would do and then point to the safe door.
Let p be the answer to the question from guards
Let ' be false guard modified answer
Which door is safe?: p' and p = 0
What would other tell about safe door: (p)' and (p') = p'
Correct way is (p')' meaning p
there is a problem with all of this... the riddle never stated they guards will answer the question within the rules we are given
Say I am the Lier. you ask me what my counter part will answer with and I can now say "Up your butt" or "Inside the rabbit's nose"
These are lies claiming the door is else where. but even if you try and counter this by trying to be specidic I can still lie about it being on the ceiling or lying about a third door.
Counter method is very simple. Force one through a door and listen for the danger behind the door if the guard is killed then you know that door is not the real one and thus go through the other. You can also call out your question to the one behind the door if they are okay and in a safe area. Since each of these door ideas come with the pain being instant you can use the death of a guard to complete the riddle.
This is called thinking outside the rules place before you aka loopholes.