AIVD Puzzle - Let's Get Cracking!

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AIVD Puzzle - Let's Get Cracking!

Post by BBP »

UPDATED FOR ERRATA: look for italics

It's time for the nefarious AIVD-puzzle.

The AIVD is the Dutch CIA. In 2012 they started publishing their puzzles. They became famous when the Dutch prime minister admitted defeat on the 2014 puzzle.
As you can imagine the puzzles are in Dutch, and since I had at least one person responding to one of the easier (though it took me hours) puzzles last year, here is, for your pleasure, the Tolkien-inspired puzzle:


#29: Raymond Merrill Smullyan (1919-2017)

Of the 13 dwarfs that accompany Bilbo on his jorurney, one or more have gotten under the influence of Sauron. Dwarfs under the influence of Sauron always lie, the others speak the truth (if they speak at all)
Which of the dwarfs tells the truth and which lie?

Bifur, Bofur and Bombur Gandalf called Bifur, Bofur and Bombur to him. One of the three stole a ring. Gandalf knows that the thief always lies, the other two will always tell the truth. He asks each of the three dwarfs: "Are you the thief?" Bombur is the only one to respond: "Either Bofur is the thief or it's me!"

Dori and Nori Gandalf called Dori and Nori to him, and asks if they know where Bilbo is. Dori replies he knows nothing. All Nori says is that both Dori and him are the same type (as in: that they either both lie or both tell the truth.)

Oin, Gloin and Ori Gandalf was looking for Bilbo and called Oin, Gloin and Ori to him, knowing that one of them knows where Bilbo is and that two of them are liars. Oin confessed that he knew where Bilbo was, and Gloin said he didn't know. When Ori answered whether or not Oin knows where Bilbo is, Gandalf knew who's lying and who's telling the truth. Gandalf couldn't hear Ori's answer.

Balin and Dwalin Elrond had his suspicions on Balin and Dwalin. He asked them "Do you both tell the truth?" He couldn't tell anything from Balin's answer (which was yes or no).
Beorn asked "Are you both liars? He couldn't tell anything from Balin's answer, which was yes or no.
Bard asked Balin: "Is it true that you tell the truth and Dwalin lies?" Bard couldn't learn anything from his answer.
Gandalf read this and knew of both Balin and Dwalin whether they lie or not.
Thorin, Kili and Fili The Arc Stone was stolen from Thorin's chambers. Bilbo, Kili and Fili were in these rooms and Thorin accuses them of theft.
Gandalf's research shows that if Bilbo was guilty, he would have had an accomplice.
He also finds that Kili and Fili are both either guilty or innocent. Gandalf knows that if there are two guilty dwarves, Bilbo is one of them. Fili and Kili both say Bilbo stole the Arc Stone.
The Mordor Spy Gandalf's problems aren't over yet. He now has to find out which of the dwarves spies for Mordor. With the knowledge who lies and who tells the truth, he can use clever questions to exclude dwarves from his research. The spy is one of the remaining dwarves of which Gandalf doesn't yet know whether they lie or not.
These dwarves are lined up next to each other in alphabetical order. The first dwarf says the last one in the row lies, but the second-to-last one tells the truth.
The second dwarf says he's innocent.
The second-to-last dwarf says the last dwarf lies. The last dwarf says he's guilty.
Last edited by BBP on Sun Jan 07, 2018 12:24 pm, edited 1 time in total.

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Post by blutype »

I'm aware of the kind of puzzles you've highlighted (above being an example) but I'm uninterested in anything related to Tolkien.

And I tend to be unable to solve complex puzzles anyway.

I can do basic Sudoku (but that gets boring soon after starting).

I can't do crosswords unless they're very easy (I imagine).

I know cryptic crosswords are a thing but I haven't tried one.

There are some people who are very adept at doing tricky crosswords (etc) in newspapers.

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Post by BBP »

How about another one: and remember these questions are often about things that happened in the past year. Haven't solved it yet but the question # does hint towards one direction...

Question 007
Make pairs of:
W5, S4, B7, J4, B2
and
M1, B2, I6, S8, T2.

What does W stand for?

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Post by BBP »

There's one that's been causing quite a stir, and it's board game based:

Karel is in Amsterdam. Where exactly is Henk?

Henk 4 5 10 7 6 6 2 4 5 7 8 4 3 3 3 9 10 6 5 5
Karel 6 7 8 7 9 8 2 12 10 5 5

The puzzle initially confused quite a few people. Now that the entry time has passed but it'll be a month before the publication of the solution, it's comparing notes - and that turns into an interesting puzzle.

Amsterdam is the dark blue city on the Dutch monopoly board. The guys are playing Monopoly.
Taking all the Monopoly rules into account, like the question mark squares and the three double jail rule, it's still hard enough to calculate where the guy would be!

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Post by BBP »

In case anyone bothered to do these:

#29: Knights and Knaves with LOTR
BBB: There is one liar, he's also the thief. If Bombur is the thief, he would also be speaking the truth, but that's not possible. So Bombur and Bifur speak the truth, Bofur lies and is the thief.
DN: If Nori lies, Dori would be different from him and a truthteller. If Nori speaks the truth, Dori would be just like him and a truthteller. Dori speaks the truth. Nori is still unknown.
OGO: One knows where Bilbo is and two are liars. If Oin's confession would be true, Gloin would also speak truth, and that's not possible. Oin lies. We don't know whether Gloin and Ori speak the truth, but we know only one of them is a liar.
BD: Elrond can't learn anything from the answer given. Had the answer been no, Balin would speak the truth and Dwalin would be lying. The answer to his question was yes: either they both speak the truth, or Balin is lying.
Beorn couldn't learn anything from his answer. Had the answer been yes, he would know Balin was lying and Dwalin speaks the truth, meaning the answer was no. By consequence, either they are both liars or Balin speaks the truth.
Combining these two data: either they both speak the truth, or they're both lying.
Bard couldn't learn anything from his answer. Had the answer been no, Bard would've known that they both speak the truth. So the answer was yes: either Dwalin lies and Balin speaks the truth, or Balin lies. Since they are both the same, they must both be liars.
TKF: Of note: Bilbo is not a dwarf, we need not know whether he lies or not.
If Bilbo was guilty, he must have had one accomplice, which couldn't have been Fili or Kili since they're either both guilty or both innocent. So Bilbo is innocent, Fili and Kili are lying But they are also both innocent since if there are 2 culprits one of them is Bilbo. So Thorin was the thief and lying. Fili and Kili are lying.
*I don't agree entirely with this explanation, since if Thorin was joining in on the party he might as well have teamed up with Bilbo meaning Fili and Kili were speaking the truth, but since I found the last question only works with 3 dwarfs, I took this option and was lucky enough to be right.

Mordor spy: We need Gloin, Nori and Ori.
Gloin says Ori lies but Nori speaks truth
Nori says he is innocent and Ori lies
Ori confesses.
If Gloin lies, Ori's confession would be truth but Nori would be guilty too, and that's not possible. So Gloin speaks truth, Nori speaks truth and Ori lies. Gloin is the spy, yet he speaks truth.

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Post by BBP »

#007:
The letters are all initials of Roger Moore characters. If you take the letter corresponding to the number behind the name (like S4 is for Simon (Templar), the 4th letter is O) the letters spell Roger Moore. W stands for Wilfred (Ivanhoe).


#Board Game Based:
This one was a bit cruel. I mentioned it was board-game based but the puzzle solvers didn't even have that information, they were just to assume that from the numbers between 2 and 12. Karel is in Amsterdam - the dark blue street on the Dutch Monopoly.
The question caused quite a stir: the puzzle makers overlooked the options that people could end up in jail by triple roll, or could end up at a different place with Chance cards etc. At the main forum on the AIVD puzzle, there was a hilarious discussion on where Henk could be. At least 5 different possible locations were found.
Eventually AIVD decided they made a mistake and issued the 4 points to anyone who correctly guessed it referred to Monopoly.

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Re: AIVD Puzzle - Let's Get Cracking!

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The nefarious AIVD puzzle is back!

So far I've solved an interesting sudoku variant and found this version of Cheryl's Birthday Puzzle:

We're looking for a specific date. A knows the month but not the day, and B knows the day but not the month.
The possible dates are:
January 26
February 8, 9
April 3, 19, 21, 22, 27
May 3, 9, 14, 18, 25, 29
June 3, 8, 23
August 18, 24
September 2, 4, 6, 27, 28
October 4, 9, 12
November 5, 12, 15
December 11, 26

A: "I don't know which date it is, and I'm positive B doesn't know it either."
B: "I didn't know it before, but hearing this I know it now."
A: "Now I know it too!"

Which date are we looking for?

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Re: AIVD Puzzle - Let's Get Cracking!

Post by idk1604 »

A guess here. Is the date Jan 26? (Because it's the only date for Jan.) And the other dates are red herrings?

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Re: AIVD Puzzle - Let's Get Cracking!

Post by BBP »

It seems like the right answer and you can make a good case for it, but you need to analyse further. A similar puzzle that reached fame is "Cheryl's Birthday Puzzle" which I recommend doing if you get stuck on this one.

AIVD asks its members not to publish the answers on public forums. Please don't post it once you find it.
If you think you can make your way with Google Translate, the puzzle is located here:
https://www.aivd.nl/onderwerpen/aivd-ke ... uzzel-2018

(Questions 8 and 9 at least are doable for non-native speakers...)

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Re: AIVD Puzzle - Let's Get Cracking!

Post by BBP »

This one too, 19E:
qmorlqditapofmqhcdah

Just found it, hurray...

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Re: AIVD Puzzle - Let's Get Cracking!

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Now onto puzzle 13 - Word Search From *beep*. Some 50 names that are all hidden in a diagram - coded using BIFID.

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Re: AIVD Puzzle - Let's Get Cracking!

Post by BBP »

Ha ha ha I'm being censored.

I was referring to someplace hot.

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Re: AIVD Puzzle - Let's Get Cracking!

Post by Jonathan Green »

Why is H E L L censored? I could type Hades and it's not censored.

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Re: AIVD Puzzle - Let's Get Cracking!

Post by BBP »

I suppose that's the PHPP standard.

Board censorship like this is a little misguided - at the official Frank Zappa forum I frequent there was a lot of words like that which in itself was bizarre considering the stance Zappa took against censorship, not to mention it made some of his song titles, like his Grammy winning Jazz From H e l l , or his masterful collage protesting the PMRC P o r n Wars, hard to type.
(fun fact: Zappa is the first and only artist ever to get a "parental advisory - explicit lyrics" sticker for an instrumental album).

At my own Zappa fan forum I can run censorship, which I once did for an April Fool's gag, turning Zappa into Zoppo.

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Re: AIVD Puzzle - Let's Get Cracking!

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The due date for the AIVD puzzle is today. I sent my form in, completed for, well, about 50% of the easiest puzzles.

This one's for 2 points, and although I didn't manage to finish it due to a family vacacion, I enjoyed it tremendously. It goes as follows:

Attached is a crossing number puzzle: B to J are all Roman numerals. What appears in A after filling in all numbers?

F = D
F is odd
C is a prime number
D > G
B + E = G + H
C - D + I = C + I + I
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Re: AIVD Puzzle - Let's Get Cracking!

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I had a lot of fun with that cross number puzzle but unfortunately I failed to solve it...

The results came in today. I scored 35 points and am therefore in a shared 439th position out of 1085 submissions. I'm in the top 50%!

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Re: AIVD Puzzle - Let's Get Cracking!

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The AIVD puzzle is back! :D

So if you're wondering what I'm doing for the next month...

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Re: AIVD Puzzle - Let's Get Cracking!

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The AIVD puzzle was beyond hard - I only found a few of the riddles. These are the only 2 that I solved that are interlingual and intercultural:

Question 5
A: If AMSTERDAM = 133424313, ROTTERDAM = 434424313 and DEN HAAG = 324 3114, what is ACQUOY?
b: And, for the younger puzzle solvers, if BEESEL = 355557, OSS = 556 and GOES = 5566, what is HEILOO?

Question 17:
A test in concise information. Who wrote/said/played/typed this?
A: 36/POP!
B: 217/STEP
c: 510/JOKE
d: 2910/LO

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Re: AIVD Puzzle - Let's Get Cracking!

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This year the AIVD puzzle also has a junior version - and my boyfriend tipped there is a Cluedo puzzle in it!

The players are Merel (girl's name, and "you"), Rob and Jeroen (boy's name).

Suspects are numbered P1 to P6
Weapons are numbered W1 to W6
Rooms are numbered K1 to K9

Merel has P3, P5, W1, K1, K3, K4


Rob asks P6 W6 K5 - Merel has nothing, Jeroen shows
Merel asks P2 W2 K1 - Jeroen has nothing, Rob shows P2
Jeroen asks P3 W2 K5 - Rob shows card
Rob asks P5 W1 K7 - Merel shows P5
Merel asks P3 W3 K8 - Jeroen shows W3
Jeroen asks P1 W4 K5 - Rob shows card
Rob asks P4 W2 K7 - Merel has nothing, Jeroen shows
Merel asks P1 W5 K9 - Jeroen shows K9
Jeroen asks P4, W1, K8 - Rob has nothing, Merel shows W1
Rob asks P4 W1 K8 - Merel shows W1
Merel asks P1 W6 K6 - Jeroen shows P1
Jeroen asks P6 W4 K4 - Rob shows card
Rob asks P4 W6 K5 - Merel has nothing, Jeroen shows card.



So that's what we're trying to find out! We're trying to find out who killed Mr Boddy, with where, and with what!!



(NOTE: DO NOT SHOW THE ANSWER!!!)

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Re: AIVD Puzzle - Let's Get Cracking!

Post by BBP »

Sooo... did any of you get to do it? I was kinda surprised at how long this Cluedo puzzle took me. I've been thinking of starting a puzzle blog / vlog for a few months and this seems like a fun one to log.

I handed in the puzzle a couple of days ago after more than a month of puzzling and am trying to remember what else it was I did again with my spare time.

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