This will make your head spin:The Hardest Logic Puzzle Ever

Celebrity Monologues

Moderators: Ice Cream Jonsey, AArdvark

User avatar
Tdarcos
Posts: 5641
Joined: Fri May 16, 2008 9:25 am
Location: Arlington, Virginia
Contact:

This will make your head spin:The Hardest Logic Puzzle Ever

Post by Tdarcos » Mon Jun 24, 2019 10:10 am

This is the sort of thing that can give headaches. Someone solved "The Hardest Logic Puzzle Ever."
The Hardest Logic Puzzle Ever goes like this:

Three gods A, B, and C are called, in some order, True, False, and Random. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. Your task is to determine the identities of A, B, and C by asking three yes-no questions; each question must be put to exactly one god. The gods understand English, but will answer all questions in their own language, in which the words for “yes” and “no” are “da” and “ja,” in some order. You do not know which word means which.


Here's the article on how it's solved: https://getpocket.com/explore/item/how- ... t-newtab0x
If you're interested in the "Law of excluded middle," discussed in the article, see this: https://en.m.wikipedia.org/wiki/Law_of_excluded_middle
"Come my restoration… Wash my body clean."
⁠— Martin Page, In the House of Stone and Light

User avatar
AArdvark
Posts: 8182
Joined: Tue May 14, 2002 6:12 pm
Location: Rochester, NY

Re: This will make your head spin:The Hardest Logic Puzzle Ever

Post by AArdvark » Mon Jun 24, 2019 5:27 pm

Is this one of those trick puzzles? Like, there are no gods so don't talk to any of them kind of thing?

THE
JUST US MONKEYS
AARDVARK

User avatar
Flack
Posts: 6205
Joined: Tue Nov 18, 2008 3:02 pm
Location: Oklahoma
Contact:

Re: This will make your head spin:The Hardest Logic Puzzle Ever

Post by Flack » Tue Jun 25, 2019 6:45 am

It took me years to understand the two-person version (which appeared in Labyrinth). That version goes like this: there are two people guarding doors; one is the one you want and the other leads to certain death. One of the guards always tells the truth and one always lies, but you don't know which is which. You can only ask one guard one question. The solution is to ask one guard which door the other guard would say is the good door, and then choose the opposite because it's guaranteed that one of them is lying. So if guard A says guard B would pick door #1, either guard A is lying (and guard B would have said door #2), or guard B is lying (and would have given you the wrong answer).

The one Tdarcos posted is infinitely more complex and has to do with asking questions that have multiple parts, like "if and only if A is true, what would you say about B" and so on. I get it, but I don't get it. I get that the complex questions eventually force the gods to give you answers that can eventually be dissected, but I don't get it to the point where I could solve it.
"Jack Flack always escapes." -Davey Osborne

User avatar
The Happiness Engine
Posts: 503
Joined: Thu Aug 02, 2012 4:16 pm

Re: This will make your head spin:The Hardest Logic Puzzle Ever

Post by The Happiness Engine » Sun Jun 30, 2019 5:56 pm

But WHAT IF... I just walked away and went and got some BBQ? Being a complex person surely it's more important that as the narrator AND protagonist that I just advance the story.

Post Reply