If they were both clever, then the dragon drinks level 1 water after the duel to make sure he's poisoned, then drinks water level 6. The knight drinks level 1 water before the battle and is either cured or poisoned, because level 1 or ocean water leaves him the same and level 2-6 cures him. Then he drinks level 1 water to make sure he's poisoned and then drinks from 2-5 to cure himself.
Yes, that's one possible answer. Lonami's way is also a possibility for the dragon to survive. I don't know if there are any more possible ways (well, you can poison and unpoison youself as much as you want to) but this is what it comes down to.
If they were both clever, then the dragon drinks level 1 water after the duel to make sure he's poisoned, then drinks water level 6. The knight drinks level 1 water before the battle and is either cured or poisoned, because level 1 or ocean water leaves him the same and level 2-6 cures him. Then he drinks level 1 water to make sure he's poisoned and then drinks from 2-5 to cure himself.
They both live! :O
IS THAT THE ANSWER?
Yeah assuming they both were clever and since drinking a lower level poison doesn't do anything. This riddle was pretty silly, with too many weird rules. Poison doesn't cure poison lol. But I guess the point was to say they both can survive or have the same odds even though the Dragon seems to have an advantage with more access to more wells.
Oho! That indeed looks like a way with 100% survival chance for the
dragon. He knows he is poisoned, he knows the knight can not cure him,
so he knows that the level-6-poison will always yield a cure for him.
Well done!
So the dragon lives and the knight dies.
What if I told you that the knight has a way for a 100% survival chance?
:D
Well, I'm taking in consideration ALL the possibilities, so I hope your answer isn't a "the knight is so wise he tricks the dragon" or something like that.
I don't think anyone can escape death after being given well 1 poison (except dragon, having drunk well 5 before).
I'll give you guys a hint. If you drink a higher numbered well, you're
cured...no more poison. If you drink a lower number well...guess what,
it REMOVES the poison you had before, and replaces it with that new
poison.
THATS WHAT YOU'VE BEEN MISSING!
What? If you drink well 4 and then well 2, you're supposed to be still well 4 poisoned, nope? or did I understand it wrong? :S
If they were both clever, then the dragon drinks level 1 water after the
duel to make sure he's poisoned, then drinks water level 6. The knight
drinks level 1 water before the battle and is either cured or poisoned,
because level 1 or ocean water leaves him the same and level 2-6 cures
him. Then he drinks level 1 water to make sure he's poisoned and then
drinks from 2-5 to cure himself.
They both live! :O
IS THAT THE ANSWER?
I don't think that works if you consider all possibilities.
If the dragon gives an unpoisoned knight a well 5 poison, then the knight is dead, so your "drink 1, then drink 5" solution wouldn't work, because 5 doesn't counter 5.
Here's something interesting...here's a neat question that creates a big twist in the story.
What if I told you that both of them had two goblets instead of one to carry well water in? What if I told you that their meeting place was in a cave? What if I told you that they got locked into the cave because of a cave in?
Umm? The knight drinks well water 1!!! before the duel. The knight is either cured with well 2-6 water, or stays poisoned with ocean water or well 1 water. Well 2-5 water cures well 1 water. Let's say the dragon gives him well 5 water. The knight drinks 1 before the duel and drinks well 5 water and is cured. He doesn't know if he's cured or not, so he decides to drink well water 1 which will not cure his well water 1 and ensures he is poisoned. Then he drinks well water 2-5 to ensure he is cured.
The simplest way to do this is for the dragon to go to the duel, drink the knight’s water and then go to the level 1 well and drink. By drinking level 1 poison, the dragon has assured himself of being poisoned with at least level 1 water and at most level 5 water. This guarantees that level 6 water will cure him.
So ultimately both can survive if they are smart enough and that's what the riddle was about because at first glance it seems like the Dragon has an advantage but truthfully if played well then both can survive and there's no advantage.
To quote again:
Quote:
So, as it turns out, the dragon’s advantage of having the level 6 well isn’t really an advantage. The game as posed turns out to be alot like tic-tac-toe. Someone appears to have a huge advantage but only against sub-optimal play. Against optimal play, neither person can win.
There are poisonings which you cure by giving the person a small amount of a different poison. Some poisons neutralize the effect of others. That's normal medicine. Of course you usually don't have level x poisons :P
If the dragon gives an unpoisoned knight a well 5 poison, then the knight is dead, so your "drink 1, then drink 5" solution wouldn't work, because 5 doesn't counter 5.
No, it works. However, it's "drink 1, then drink the dragon's water, then drink 1 again, then drink 5".
If the dragon gave him a high-level poison like 6, then he'll be cured because he drank 1 before. Then he re-poisons himself with 1 and heals it with 5.
If the dragon gave him normal water then he'd be poisoned with 1. He'd drink 1 again (which doesn't change anything). Then he drinks 5 and is healed.
I'we seen that this isnt the original question of the riddle.
Original question of riddle is the answer you are asking. That has more outcomes.
A dragon and knight live on an island. This island has six poisoned wells, numbered 1 to 6.
-That they live on island means that there is water around the island, non-poisonous=not from wells.
If you drink from a well, you can only save yourself by drinking from a higher numbered well. In this case both poisons will neutralize each other and you are healed.
-This means that if you drink from number 1 well, you can be CURED by drinking from any wells from 2 to 5/6.
-Also, there is NO MENTION that drinking from LOVER number well will kill you; drinking 1 after you drink 2 has no effect; in this case you can be healed only by drinking higher number well.
-Additional to that, we are talking about poison. Poison can kill you immediately or it can last for very long. Venom(animal poison, by bite) usually kills faster.
Well 6 is located at the top of a high mountain, so only the dragon can reach it. One day they decide that the island isn’t big enough for the two of them, and they have a duel. Each of them brings a glass of water to the duel, they exchange glasses, and drink.
-Only dragon can drink from well number 6.
"One day they decide that the island isn’t big enough for the two of them, and they have a duel."-If they want duel, this means they want to KILL each other. Meaning, that knight wants to kill Dragon, and Dragons wants to kill Knight.
-Dragon can drink water 0/1-6. And Knight will 0/1-7.
-Well is located on the TOP of the mountain. That WOULD means Knight doesnt know of that well. But actually in the riddle it says >only dragon can reach it<, and this s same as saying Knight can't reach that well, that probbly means that he knows of it.
-Other possible outcome is that water goes down the mountain. But I doubt that, tho it would be logical.
-Each of them brings ONE GLASS of water.
Both the knight and the dragon cannot be sure of what the other one will give them. Of course they're looking for ways to surely win their duel.
"Of course they're looking for ways to surely win their duel." - winning the duel means defeating enemy player. So it means killing enemy and surviving. I am not sure... maybe you just need to survive longer(to win). Anyway, this means that they have to bring highest water to kill their enemy if they havent drink anything before(drinking nothing is same as drinking water 0-around the island, if there is any, but it should be, since why the heck is anyone mentioning island... well arent only on islands).
0/1-6 is same as 0/1-3/4.
What can each get?
:Water 0(if it exists), water 1-5/6.
-If you get water 0(equal to not drinking water at all), you survive by NOT DRINKING any other well water before the duel.
....
-If you drink well water, you must drink 1. You can survive only if you get well water higher than 1. If you get 1, you arent cured, and only way by being cured is to drink higher level cure. Now we dont know how much it takes poison to kill you. But I think its INSTANT. Why ? Coz, why would you get to chances to survive. One is to being cured at duel, and another is by walking to other well and cure yourself. Its and island, so it probbly takes long to get to the well. Logic would be that you die. But its not mentioned. And cant be determined. There is no kill word. Oh wait. There is one note on that >you can only be cured by drinking higher level poison< saying that it means that you are allowed to drink lower level poison. And that you can walk to the well and drink higher level poison to cure itself.
Taking that into account this means that either you are allowed to drink poison water or any water before the duel, and after duel. Because you are ALLOWED to be healed. Riddle says it.
=Of course they're looking for ways to surely win their duel.=
-This means that they must to things that they know will guarantee their victory. Not what they think will happen.
Saying this. If Knight wants to win he must:
Get highest well 6 poison(without thinking he will get lowest...)
Give dragon pure water
=He knows that dragon can drink level 6 and be cured.
=He knows that he cant get level 6 and be cured.
=He knows he can get pure water or 1-6
If Dragon wants to win he must:
Get highest well 5 poison(without thinking he will get lowest...)
Give Knight well 6 water knowing that there is no cure.
=He knows knight cant get level 6 and be cured.
=He knows that he can drink level 6 and be cured.
=He knows he can get pure water or 1-5.
Who dies and who lives? And how?
This is bullshit, there are more solutions since I think there actually is pure water around the island. But it might be sea, solt xD.
Its bullshit anyway.
And yes, looks like Dragon would live no matter what based on facts.
There are poisonings which you cure by giving the person a small amount of a different poison. Some poisons neutralize the effect of others. That's normal medicine. Of course you usually don't have level x poisons :P
Normal medicine? I don't get poisoned often so maybe I don't know but usually they should give antibiotics to treat sickness. But if some poison neutralize the effect of others then it gives you another poison that's probably more curable with antibiotics, you'd still be sick if they only gave you poison to cure poison, you still need medicine!
Although that's not really what I was talking about with the rules. The guidelines seemed a bit vague at first and really open to the imagination but really theres a specific set of rules that initially isn't said in the riddle. Like what happen if you drink #5 then go drink #1, it isn't said that it kills you but it also isn't said that it does.
Guyz realize few things... if you want VICTORY that means that you dont want DRAW. So nobody will do anything can result in a draw or lose.
You will do only what can result in victory.
Another thing is that they are both EQUAL. So dont make up things like, Knight would do that to trick Dragon...
Dragon should live since he has access to higher level well... simple as that.
No, it works. However, it's "drink 1, then drink the dragon's water,
then drink 1 again, then drink 5".
If the dragon gave him a high-level poison like 6, then he'll be cured
because he drank 1 before. Then he re-poisons himself with 1 and heals
it with 5.
If the dragon gave him normal water then he'd be poisoned with 1. He'd
drink 1 again (which doesn't change anything). Then he drinks 5 and is
healed.
Would work too, yeah, although I thought they weren't able to go drinking everything like that.
There are poisonings which you cure by giving the person a small amount
of a different poison. Some poisons neutralize the effect of others.
That's normal medicine. Of course you usually don't have level x poisons
:P
Normal medicine? I don't get poisoned often so maybe I don't know but
usually they should give antibiotics to treat sickness. But if some
poison neutralize the effect of others then it gives you another poison
that's probably more curable with antibiotics, you'd still be sick if
they only gave you poison to cure poison, you still need medicine!
Although that's not really what I was talking about with the rules. The
guidelines seemed a bit vague at first and really open to the
imagination but really theres a specific set of rules that initially
isn't said in the riddle. Like what happen if you drink #5 then go drink
1, it isn't said that it kills you but it also isn't said that it does.
It's a goddamn magic water. End of discussion :P xDDD.
What if I told you that they were both smarter than you realize? What if I told you that they came to this place and were therefore not born there? What if I told you that the knight had a rope?
Obviously, the dragon kills the knight by feeding him poison #6 which he cannot cure. Similarly, the dragon can cure any poison that knight has given him by flying up to #6 after the duel. This answer should immediately seem “too obvious” and therefore give anyone pause as choosing it as correct.
Quote:
If I told you that the Knight was very clever and the actual result was that he lived, and the dragon died? Can you figure out how this could happen?
The knight knows the dragon will try to poison him with #6. He can use this to his advantage. If the knight pre-poisons himself (say, by drinking from the level 1 well) before coming to the duel, the dragon’s offering of level 6 poison becomes a cure. Similarly, he can provide the dragon with fresh water at the duel. The dragon will then, believing himself poisoned, fly to the top and poison himself with now incurable level 6 poison.
This answer is usually how the riddle is “solved”. Note my scare quotes. This answer is incredibly unsatisfactory because it depends on an assumption of a (somewhat) stupid dragon. In some sense, it’s just plain wrong. A dumb dragon wouldn’t behave this way and neither should a smart dragon.
Quote:
What if we assume both are equally clever? What’s the optimum strategy for both Knight and Dragon?
Would it surprise you if I told you that the Knight cannot kill the dragon? Want to stop and think about it? The dragon can only successfully cure himself with the level 6 poison if he is already poisoned. He cannot be sure he is poisoned after the duel. Is that enough of a hint? What if we go step by step? What does the dragon know before the duel. What about after? What happens if he knows he poisoned by levels 1-5 water? The answer should become increasingly obvious and I’m sure most of you figured it out relatively early in this paragraph.
The simplest way to do this is for the dragon to go to the duel, drink the knight’s water and then go to the level 1 well and drink. By drinking level 1 poison, the dragon has assured himself of being poisoned with at least level 1 water and at most level 5 water. This guarantees that level 6 water will cure him.
How about the Knight? Surely the disadvantage of no access to the level 6 well dooms him, right? What if I told you that the Knight, also, should always survive? Want to figure it out?
The logic follows almost identically from the dragon’s situation. If the Knight gets poisoned by level 6 water, he dies. Therefore, he must come pre-poisoned in order to avoid getting level 6 poisoned. Therefore, after the duel, the Knight is either cured by some higher level poison, or has his original level of poison. Given that knowledge, the Knight can pre-poison himself with level 1 and go to the duel. After the duel, he is either level 1 poisoned or cured. By re-drinking level 1, he guarantees himself to be level 1 poisoned. He can now cure himself at any of the higher level wells.
Guyz realize few things... if you want VICTORY that means that you dont want DRAW. So nobody will do anything can result in a draw or lose.
You will do only what can result in victory.
You want to have the best possible result.
In this case it means killing the dragon and surviving (as the knight).
You cannot exactly do anything to improve your chances of killing the dragon. Giving him higher level poison doesn't have to kill him more than lower level or even normal water.
However, you can do something to increase your own chances of survival (up to 100%) which, in my eyes, is a HUGE PART of winning a duel :)
Who says you are the knight... You are just an observer.
BTW I got one really great. AND I GOT THE ANSWER AHAHAHA. This means my IQ must be same as kids in Kindergartners have lol.
Can you answer this question? It's the world's hardest riddle and 80 percent of Kindergartners solved it compared to 5 percent of Stanford graduates. The word has 7 letters, preceded by God, greater than God, more evil than the devil, and if you eat it, you will die. We bet there's nothing you do to figure this brain teaser out.
Dont search for the answer, do it from your head. If you know answer write it but dont say its the answer. I found this on internet. So you can look it up, but remember, dont reveal real answer and try to answer before you look for the answer.
I actually asked another person if my answer is right. Tho I havent confirmed it yet :D.
Normal medicine? I don't get poisoned often so maybe I don't know but usually they should give antibiotics to treat sickness. But if some poison neutralize the effect of others then it gives you another poison that's probably more curable with antibiotics, you'd still be sick if they only gave you poison to cure poison, you still need medicine!
Although that's not really what I was talking about with the rules. The guidelines seemed a bit vague at first and really open to the imagination but really theres a specific set of rules that initially isn't said in the riddle. Like what happen if you drink #5 then go drink #1, it isn't said that it kills you but it also isn't said that it does.
Let's have an example:
You probably know of Curare, a very deadly neurotixin. It stops the acetylcholin in your body to work, which - in short - kills you.
An antidote for this is neostigmin, which is also extremely deadly on it's own. It kills you by increasing the acetylcholin level.
In short: One kills you by draining you of something, one kills you by producing too much. They even each other out.
Seems like the answer which is 100% sure is that the dragon can't die. Whatever water is brought by the knight, it doesn't matter: the poison taken by the dragon before the duel is still #1 and the poison after the duel is still #6, so he is safe anyway. The knight is only safe if the dragon serves him #6 poison to counter the #1 taken before the duel...
If they were both clever, then the dragon drinks level 1 water after the duel to make sure he's poisoned, then drinks water level 6. The knight drinks level 1 water before the battle and is either cured or poisoned, because level 1 or ocean water leaves him the same and level 2-6 cures him. Then he drinks level 1 water to make sure he's poisoned and then drinks from 2-5 to cure himself.
They both live! :O
IS THAT THE ANSWER?
@ZealNaga: Go
They drink at the same time, yes. And they only drink their opponents water. They don't drink their own (because it is drunk by their opponent).
@yukaboy: Go
Yes, that's one possible answer. Lonami's way is also a possibility for the dragon to survive. I don't know if there are any more possible ways (well, you can poison and unpoison youself as much as you want to) but this is what it comes down to.
Yeah assuming they both were clever and since drinking a lower level poison doesn't do anything. This riddle was pretty silly, with too many weird rules. Poison doesn't cure poison lol. But I guess the point was to say they both can survive or have the same odds even though the Dragon seems to have an advantage with more access to more wells.
Well, I'm taking in consideration ALL the possibilities, so I hope your answer isn't a "the knight is so wise he tricks the dragon" or something like that.
I don't think anyone can escape death after being given well 1 poison (except dragon, having drunk well 5 before).
What? If you drink well 4 and then well 2, you're supposed to be still well 4 poisoned, nope? or did I understand it wrong? :S
I think Serius left it clear at the first post.
I don't think that works if you consider all possibilities.
If the dragon gives an unpoisoned knight a well 5 poison, then the knight is dead, so your "drink 1, then drink 5" solution wouldn't work, because 5 doesn't counter 5.
Here's something interesting...here's a neat question that creates a big twist in the story.
What if I told you that both of them had two goblets instead of one to carry well water in? What if I told you that their meeting place was in a cave? What if I told you that they got locked into the cave because of a cave in?
How do you answer that one? :O
@Lonami: Go
Umm? The knight drinks well water 1!!! before the duel. The knight is either cured with well 2-6 water, or stays poisoned with ocean water or well 1 water. Well 2-5 water cures well 1 water. Let's say the dragon gives him well 5 water. The knight drinks 1 before the duel and drinks well 5 water and is cured. He doesn't know if he's cured or not, so he decides to drink well water 1 which will not cure his well water 1 and ensures he is poisoned. Then he drinks well water 2-5 to ensure he is cured.
See now???
@Lonami: Go
To quote:
So ultimately both can survive if they are smart enough and that's what the riddle was about because at first glance it seems like the Dragon has an advantage but truthfully if played well then both can survive and there's no advantage.
To quote again:
There are poisonings which you cure by giving the person a small amount of a different poison. Some poisons neutralize the effect of others. That's normal medicine. Of course you usually don't have level x poisons :P
No, it works. However, it's "drink 1, then drink the dragon's water, then drink 1 again, then drink 5".
If the dragon gave him a high-level poison like 6, then he'll be cured because he drank 1 before. Then he re-poisons himself with 1 and heals it with 5.
If the dragon gave him normal water then he'd be poisoned with 1. He'd drink 1 again (which doesn't change anything). Then he drinks 5 and is healed.
I'we seen that this isnt the original question of the riddle.
Original question of riddle is the answer you are asking. That has more outcomes.
A dragon and knight live on an island. This island has six poisoned wells, numbered 1 to 6.
-That they live on island means that there is water around the island, non-poisonous=not from wells.
If you drink from a well, you can only save yourself by drinking from a higher numbered well. In this case both poisons will neutralize each other and you are healed.
-This means that if you drink from number 1 well, you can be CURED by drinking from any wells from 2 to 5/6.
-Also, there is NO MENTION that drinking from LOVER number well will kill you; drinking 1 after you drink 2 has no effect; in this case you can be healed only by drinking higher number well.
-Additional to that, we are talking about poison. Poison can kill you immediately or it can last for very long. Venom(animal poison, by bite) usually kills faster.
Well 6 is located at the top of a high mountain, so only the dragon can reach it. One day they decide that the island isn’t big enough for the two of them, and they have a duel. Each of them brings a glass of water to the duel, they exchange glasses, and drink.
-Only dragon can drink from well number 6.
"One day they decide that the island isn’t big enough for the two of them, and they have a duel."-If they want duel, this means they want to KILL each other. Meaning, that knight wants to kill Dragon, and Dragons wants to kill Knight.
-Dragon can drink water 0/1-6. And Knight will 0/1-7.
-Well is located on the TOP of the mountain. That WOULD means Knight doesnt know of that well. But actually in the riddle it says >only dragon can reach it<, and this s same as saying Knight can't reach that well, that probbly means that he knows of it.
-Other possible outcome is that water goes down the mountain. But I doubt that, tho it would be logical.
-Each of them brings ONE GLASS of water.
Both the knight and the dragon cannot be sure of what the other one will give them. Of course they're looking for ways to surely win their duel. "Of course they're looking for ways to surely win their duel." - winning the duel means defeating enemy player. So it means killing enemy and surviving. I am not sure... maybe you just need to survive longer(to win). Anyway, this means that they have to bring highest water to kill their enemy if they havent drink anything before(drinking nothing is same as drinking water 0-around the island, if there is any, but it should be, since why the heck is anyone mentioning island... well arent only on islands).
0/1-6 is same as 0/1-3/4.
What can each get?
:Water 0(if it exists), water 1-5/6.
-If you get water 0(equal to not drinking water at all), you survive by NOT DRINKING any other well water before the duel. ....
-If you drink well water, you must drink 1. You can survive only if you get well water higher than 1. If you get 1, you arent cured, and only way by being cured is to drink higher level cure. Now we dont know how much it takes poison to kill you. But I think its INSTANT. Why ? Coz, why would you get to chances to survive. One is to being cured at duel, and another is by walking to other well and cure yourself. Its and island, so it probbly takes long to get to the well. Logic would be that you die. But its not mentioned. And cant be determined. There is no kill word. Oh wait. There is one note on that >you can only be cured by drinking higher level poison< saying that it means that you are allowed to drink lower level poison. And that you can walk to the well and drink higher level poison to cure itself.
Taking that into account this means that either you are allowed to drink poison water or any water before the duel, and after duel. Because you are ALLOWED to be healed. Riddle says it.
=Of course they're looking for ways to surely win their duel.=
-This means that they must to things that they know will guarantee their victory. Not what they think will happen.
Saying this. If Knight wants to win he must:
Get highest well 6 poison(without thinking he will get lowest...)
Give dragon pure water
=He knows that dragon can drink level 6 and be cured.
=He knows that he cant get level 6 and be cured.
=He knows he can get pure water or 1-6
If Dragon wants to win he must:
Get highest well 5 poison(without thinking he will get lowest...)
Give Knight well 6 water knowing that there is no cure.
=He knows knight cant get level 6 and be cured.
=He knows that he can drink level 6 and be cured.
=He knows he can get pure water or 1-5.
Who dies and who lives? And how?
This is bullshit, there are more solutions since I think there actually is pure water around the island. But it might be sea, solt xD.
Its bullshit anyway.
And yes, looks like Dragon would live no matter what based on facts.
Normal medicine? I don't get poisoned often so maybe I don't know but usually they should give antibiotics to treat sickness. But if some poison neutralize the effect of others then it gives you another poison that's probably more curable with antibiotics, you'd still be sick if they only gave you poison to cure poison, you still need medicine!
Although that's not really what I was talking about with the rules. The guidelines seemed a bit vague at first and really open to the imagination but really theres a specific set of rules that initially isn't said in the riddle. Like what happen if you drink #5 then go drink #1, it isn't said that it kills you but it also isn't said that it does.
Guyz realize few things... if you want VICTORY that means that you dont want DRAW. So nobody will do anything can result in a draw or lose.
You will do only what can result in victory.
Another thing is that they are both EQUAL. So dont make up things like, Knight would do that to trick Dragon...
Dragon should live since he has access to higher level well... simple as that.
Any other possibility can lead to draw or risk.
@tigerija: Go
It will always be a draw unless one of them is suicidal or stupid.
You just drink #1 before the duel, then drink #1 after the duel and then #2 and you're cured. 100% success rate no matter what.
Would work too, yeah, although I thought they weren't able to go drinking everything like that.
Then, both survive.
It's a goddamn magic water. End of discussion :P xDDD.
What if I told you that they were both smarter than you realize? What if I told you that they came to this place and were therefore not born there? What if I told you that the knight had a rope?
:O
There's the answer JEEZ!!!
Its just a bad riddle coz its being changed by s3rius :D.
Try this: http://www.deathball.net/notpron/
Uh oh, this is hard... DONT CHEAT YOU WUSSY!!
You want to have the best possible result.
In this case it means killing the dragon and surviving (as the knight).
You cannot exactly do anything to improve your chances of killing the dragon. Giving him higher level poison doesn't have to kill him more than lower level or even normal water.
However, you can do something to increase your own chances of survival (up to 100%) which, in my eyes, is a HUGE PART of winning a duel :)
Who says you are the knight... You are just an observer.
BTW I got one really great. AND I GOT THE ANSWER AHAHAHA. This means my IQ must be same as kids in Kindergartners have lol.
Can you answer this question? It's the world's hardest riddle and 80 percent of Kindergartners solved it compared to 5 percent of Stanford graduates. The word has 7 letters, preceded by God, greater than God, more evil than the devil, and if you eat it, you will die. We bet there's nothing you do to figure this brain teaser out.
Dont search for the answer, do it from your head. If you know answer write it but dont say its the answer. I found this on internet. So you can look it up, but remember, dont reveal real answer and try to answer before you look for the answer.
I actually asked another person if my answer is right. Tho I havent confirmed it yet :D.
Let's have an example:
You probably know of Curare, a very deadly neurotixin. It stops the acetylcholin in your body to work, which - in short - kills you.
An antidote for this is neostigmin, which is also extremely deadly on it's own. It kills you by increasing the acetylcholin level.
In short: One kills you by draining you of something, one kills you by producing too much. They even each other out.
Seems like the answer which is 100% sure is that the dragon can't die. Whatever water is brought by the knight, it doesn't matter: the poison taken by the dragon before the duel is still #1 and the poison after the duel is still #6, so he is safe anyway. The knight is only safe if the dragon serves him #6 poison to counter the #1 taken before the duel...