## Search found 84 matches

- Fri Feb 26, 2016 8:44 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1648: "Famous Duos"
- Replies:
**44** - Views:
**8938**

### Re: 1648: "Famous Duos"

Everything matches up except the extraneous Bill & Ted movie title. It's actually really bugging me.

- Mon Sep 14, 2015 1:08 am UTC
- Forum: Logic Puzzles
- Topic: Anti-Gambler's Fallacy
- Replies:
**162** - Views:
**27954**

### Re: Anti-Gambler's Fallacy

We can get around the certainty issue. Suppose the game is being run by a sufficiently advanced alien, wielding godlike power you can't hope to understand. At the start of the game he tells you that the odds are 70:30 in your favor. He then pulls you aside and whispers to you "We both know I ca...

- Thu Sep 03, 2015 7:03 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1572: "xkcd Survey"
- Replies:
**366** - Views:
**131632**

### Re: 1572: "xkcd Survey"

I can never spell definitely without looking it up. I always know it's either "definitely" or "definately", can never remember which, and almost always guess wrong. Even if I take into account that I always get it wrong and thus choose the option that seems wrong at the time, I g...

- Fri Jul 17, 2015 7:21 am UTC
- Forum: Logic Puzzles
- Topic: Rethinking the Prisoner's Dilemma
- Replies:
**31** - Views:
**5927**

### Re: Rethinking the Prisoner's Dilemma

Back on topic: -the other person is exactly as intelligent as me and is in an exactly symmetric situation. -therefore we will make exactly the same decision. -so I am choosing between CC and DD -CC gets me more reward than DD -so I will choose cooperate The problem with superrationality in this inst...

- Fri Jul 10, 2015 6:06 am UTC
- Forum: Logic Puzzles
- Topic: Rethinking the Prisoner's Dilemma
- Replies:
**31** - Views:
**5927**

### Re: Rethinking the Prisoner's Dilemma

You're gonna have to explain your reasoning. I have a feeling that I'll disagree with it.

- Wed Nov 02, 2011 4:53 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0972: "November"
- Replies:
**131** - Views:
**57140**

### Re: 0972: "November"

I'm a bit confused. Are some people not always aware of their tongues? I mean, I'm tasting the inside of my mouth at all times. Never a dull moment.

- Fri Aug 26, 2011 6:05 am UTC
- Forum: Logic Puzzles
- Topic: The perfect Chess AI engine
- Replies:
**89** - Views:
**42825**

### Re: The perfect Chess AI engine

Hunches and guesses don't count for much. Many expert players with a great deal of experience in connect 4 believed the game was a draw, until it was solved and shown to be a first-player win. The optimal result of chess under perfect play (white always wins, draw, or black always wins) is simply u...

- Wed Apr 06, 2011 4:03 am UTC
- Forum: Logic Puzzles
- Topic: Mind swapping
- Replies:
**2** - Views:
**1738**

### Mind swapping

This is inspired by an episode of Futurama. I don't know any of the answers myself, but I find the problem interesting. No idea if it's easy or hard. You have a machine that can swap people's minds. It connects to exactly two people at once. Hook it up to person A and person B, for example, and you'...

- Wed Mar 23, 2011 4:46 am UTC
- Forum: Logic Puzzles
- Topic: Infinite Balls and Jugs [solution]
- Replies:
**611** - Views:
**122878**

### Re: Infinite Balls and Jugs [solution]

This can happen in our universe. Ruler and pencil. Yes, I saw that post. That doesn't mean it can happen in our universe. The ruler and pencil example requires infinitely divisible length and matter, as well as infinite precision in both action and observation. That's much closer to reality than th...

- Wed Mar 23, 2011 4:17 am UTC
- Forum: Logic Puzzles
- Topic: Infinite Balls and Jugs [solution]
- Replies:
**611** - Views:
**122878**

### Re: Infinite Balls and Jugs [solution]

Out of all of the unintuitive and seemingly paradoxical problems on the board, this one bugs me the most, by far. I must have been convinced that the jar was empty at some point, because I've posted in this topic effectively saying so, but I guess it didn't stick. So, here's my issue. I'm looking at...

- Wed Jan 26, 2011 7:12 am UTC
- Forum: Logic Puzzles
- Topic: The hardest maze in the world
- Replies:
**20** - Views:
**6847**

### Re: The hardest maze in the world

So, which open problem is this equivalent to?

- Tue Jan 25, 2011 12:38 am UTC
- Forum: Logic Puzzles
- Topic: Bandy Ball
- Replies:
**20** - Views:
**3739**

### Re: Bandy Ball

Well, if you can hit it, say, 32 and 64 yards, then you can never complete the first hole. Should we assume you want the worst combo that can actually finish the course?

- Wed Dec 08, 2010 6:15 am UTC
- Forum: Logic Puzzles
- Topic: Help with a diagram puzzle
- Replies:
**4** - Views:
**1929**

### Re: Help with a diagram puzzle

I started with the six-connection node in the middle. I was able to show pretty easily that it had to be either 5 or 7, but 7 was possible only under extremely specific circumstances (the six surrounding nodes must be 0, 1, 2, 3, 4, and 5), so I explored that avenue first, expecting to easi...

- Tue Nov 23, 2010 5:37 am UTC
- Forum: Logic Puzzles
- Topic: Programmer problem
- Replies:
**18** - Views:
**4370**

### Re: Programmer problem

DROD is pretty amazing. Anyone who enjoys puzzles could do a lot worse than to check it out. I've got to admit, though, I don't know how you would create a puzzle like this within the game's mechanics. Something to do with mimics?

- Wed Aug 11, 2010 4:27 am UTC
- Forum: Logic Puzzles
- Topic: Eight problems for intuition in basic classical mechanics
- Replies:
**59** - Views:
**11601**

### Re: Eight problems for intuition in basic classical mechanic

Well, nevermind then.

- Wed Aug 11, 2010 4:20 am UTC
- Forum: Logic Puzzles
- Topic: Eight problems for intuition in basic classical mechanics
- Replies:
**59** - Views:
**11601**

### Re: Eight problems for intuition in basic classical mechanic

[...]The example I have in mind is a very deep sheer drop, where if the mass is forced to follow the track, will get to the bottom almost instantly,[...] But where would it get the huge amount of kinetic energy it'd take to get to the bottom of the drop almost instantly? I guess it depends on e...

- Fri May 21, 2010 10:36 pm UTC
- Forum: Logic Puzzles
- Topic: Not as easy as 1 2 3
- Replies:
**56** - Views:
**14419**

### Re: Not as easy as 1 2 3

**Spoiler:**

- Fri May 07, 2010 4:15 am UTC
- Forum: Logic Puzzles
- Topic: Palindromic Odometer
- Replies:
**19** - Views:
**3652**

### Re: Palindromic Odometer

**Spoiler:**

- Tue Apr 20, 2010 10:22 pm UTC
- Forum: Logic Puzzles
- Topic: Coin Flip Sequencing
- Replies:
**7** - Views:
**2456**

### Re: Coin Flip Sequencing

If you have one person flipping coins and stopping as soon as he hits either sequence, then the chance of either sequence being the first one hit is exactly 50%, for the reasons Tunga gave. If you have two different people flipping coins, one of them looking for HTH and one looking for HTT, then th...

- Sat Apr 17, 2010 7:09 am UTC
- Forum: Logic Puzzles
- Topic: Celebrity Problem Puzzle
- Replies:
**12** - Views:
**4717**

### Re: Celebrity Problem Puzzle

I suppose I should be happy that there's still one place on the internet where nobody recognizes Miley Cyrus, but shame on you for not knowing the mad scientist of the Food Network, Alton Brown. He's awesome. Adding the missing letters from those two gives us PLAY DASH. If that's not th...

- Wed Apr 14, 2010 5:12 pm UTC
- Forum: Logic Puzzles
- Topic: Is This Even Possible?
- Replies:
**77** - Views:
**27331**

### Re: Is This Even Possible?

The first answer gives no information beyond identifying one word for yes or no. The yes/no words can be described as "the answer given to the first question" and "the answer not given to the first question", and reducing them to these labels does not remove any information. Sin...

- Wed Apr 14, 2010 4:24 pm UTC
- Forum: Logic Puzzles
- Topic: Is This Even Possible?
- Replies:
**77** - Views:
**27331**

### Re: Is This Even Possible?

I don't believe that argument is correct. The first question may not provide us with any immediate information, but we may learn enough from the other two questions to go back and interpret that first answer. Suppose my first question is asked to A, and goes "Is exactly one of the following tr...

- Wed Apr 14, 2010 6:42 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0727: "Trade Expert"
- Replies:
**172** - Views:
**45768**

### Re: “Trade Expert” discussion

I've gotta admit, the distinction between slashes and backslashes has always seemed completely backwards to me. Naturally, when writing a slash, you start at the top and go down. So... a regular slash starts at the top and goes backwards from there, while a backslash starts at the top and goes forwa...

- Tue Apr 13, 2010 9:13 pm UTC
- Forum: Logic Puzzles
- Topic: Is This Even Possible?
- Replies:
**77** - Views:
**27331**

### Re: Is This Even Possible?

I don't believe that argument is correct. The first question may not provide us with any immediate information, but we may learn enough from the other two questions to go back and interpret that first answer. Suppose my first question is asked to A, and goes "Is exactly one of the following tru...

- Fri Feb 26, 2010 3:52 am UTC
- Forum: Logic Puzzles
- Topic: Is This Even Possible?
- Replies:
**77** - Views:
**27331**

### Re: Is This Even Possible?

In this scenario I would probably manage to create a paradox. I will call them 1, 2, and 3 to explain. If I asked 1 "Would 2 answer my question truthfully?, then asked him the same about 3. and finally asked 2 about 1. One of them would be answering a question about the random one. In that cas...

- Sat Jan 23, 2010 7:33 am UTC
- Forum: Logic Puzzles
- Topic: Is This Even Possible?
- Replies:
**77** - Views:
**27331**

### Re: Is This Even Possible?

It is impossible. Because you are trying to identify each daemon, rather than determine which is a safe door to open (or whatever the goal is of variation of these riddles you prefer), your possible outcomes have gone from 2 to 6. Since there are 3 yes/no questions that can be answered, you...

- Wed Jan 06, 2010 10:27 pm UTC
- Forum: Logic Puzzles
- Topic: 2 puppies
- Replies:
**132** - Views:
**18725**

### Re: 2 puppies

**Spoiler:**

- Tue Jan 05, 2010 3:10 am UTC
- Forum: Logic Puzzles
- Topic: Value of One Bit
- Replies:
**26** - Views:
**4333**

### Re: Value of One Bit

Ask the genie "Will the total number of heads flipped exceed the total number of tails flipped by at least x, where x is the number of dollars I have, before the total number of tails flipped exceeds the total number of heads flipped by x?" If he says yes, play heads repeatedly until you ...

- Wed Dec 23, 2009 2:17 am UTC
- Forum: Logic Puzzles
- Topic: Little Pigley Farm
- Replies:
**7** - Views:
**1669**

### Re: Little Pigley Farm

It's my own fault. I was originally going to complain that part of the grid had two possible answers, and only realized right before posting that I was wrong. If I'd just read the problem description a little better in the first place, I would have made it in time.

- Tue Dec 22, 2009 11:58 pm UTC
- Forum: Logic Puzzles
- Topic: Little Pigley Farm
- Replies:
**7** - Views:
**1669**

### Re: Little Pigley Farm

**Spoiler:**

- Tue Dec 01, 2009 12:15 pm UTC
- Forum: Logic Puzzles
- Topic: Are these puzzles too obscure?
- Replies:
**25** - Views:
**3886**

### Re: Are these puzzles too obscure?

puzzle 2:

**Spoiler:**

- Sun Nov 29, 2009 11:38 pm UTC
- Forum: Logic Puzzles
- Topic: Are these puzzles too obscure?
- Replies:
**25** - Views:
**3886**

### Re: Are these puzzles too obscure?

Without knowing the answers, it's very hard to say whether or not the clues can reasonably lead to them. It looks like there's a good deal of information available, but if you really want an opinion on whether the puzzles are unfair, you should tell us the answers (or wait for us to solve these, but...

- Thu Nov 12, 2009 9:35 pm UTC
- Forum: Logic Puzzles
- Topic: Infinite Balls and Jugs [solution]
- Replies:
**611** - Views:
**122878**

### Re: Infinite Balls and Jugs [solution]

I love the ruler example. So, what happens if we apply that same logic to the case where instead of removing a ball, we relabel it?

- Thu Nov 05, 2009 9:33 pm UTC
- Forum: Mathematics
- Topic: Can anyone maximize this expression?
- Replies:
**11** - Views:
**1591**

### Re: Can anyone maximize this expression?

Are we to assume that our wolves can always find a partner outside the team if possible? That is, if our team has 10 wolves and there are a total of 10 people outside our team, do we disregard the possibility that some of them might match up with each other, leaving some of our wolves unable to earn...

- Tue Nov 03, 2009 5:55 am UTC
- Forum: Logic Puzzles
- Topic: My write-up of the "Blue Eyes" solution (SPOILER A
- Replies:
**1368** - Views:
**424534**

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

I honestly do not understand how people can be arrogant enough to come into a thread like this and say "I'm right, all of you are wrong, and shame on you" without a hint of doubt. Is it really easier to believe that this many pages full of intelligent posts are wrong than to consider that ...

- Sun Nov 01, 2009 8:25 pm UTC
- Forum: Logic Puzzles
- Topic: My write-up of the "Blue Eyes" solution (SPOILER A
- Replies:
**1368** - Views:
**424534**

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

The information the Guru gives is due to the fact that the claim is made in public. Everyone can see that everyone is there to hear it, and everyone can see that everyone can see that everyone is there to hear it, and everyone can see that everyone can see that everyone can see that everyone is ther...

- Sun Oct 11, 2009 4:47 am UTC
- Forum: Mathematics
- Topic: Second Ace Paradox
- Replies:
**66** - Views:
**8419**

### Re: Second Ace Paradox

Well, the problem isn't stated quite well enough to determine things precisely as it stands. For instance, you have no way of knowing under what circumstances the player in the first case would say "I have an ace". When you consider that she later says "I have the ace of spades",...

- Fri Oct 09, 2009 6:32 pm UTC
- Forum: Logic Puzzles
- Topic: My write-up of the "Blue Eyes" solution (SPOILER A
- Replies:
**1368** - Views:
**424534**

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Can A think B think C think D sees 96? No, because this A's knowledge that C sees 98, and A's knowledge that B knows that C and D can see 98. This simply isn't true. A knows that B, C, and D can see at least 98, A knows that B knows that C and D each see at least 97, and A knows that B knows that C...

- Mon Oct 05, 2009 11:26 pm UTC
- Forum: Gaming
- Topic: Scripted events are killing gaming
- Replies:
**53** - Views:
**4682**

### Re: Scripted events are killing gaming

Personally, I love scripted events. To me, a single-player game is a competition between the creator and the player. He designs obstacles that challenge you in various ways and to various degrees, and you try to conquer them. Immersion is a factor, but not a big one. If you have to sacrifice immersi...

- Thu Oct 01, 2009 1:57 pm UTC
- Forum: Logic Puzzles
- Topic: Betting Game
- Replies:
**21** - Views:
**3968**

### Re: Betting Game

@RaptorJesus: The important point here is that you cannot manipulate the odds. The chances of winning any given game are 20%. This will not change, ever, no matter what you do. Now, it's true that losing five games in a row is somewhat unlikely. I haven't bothered to do the math myself, but Madge sa...