## New here

Anything goes, but keep it seemly...

### New here

Hi, I'm Laura and I like sudoku.
I like all kinds of brain teasers
and logic puzzles. Anyone here into
3-D puzzles?
Laura

Posts: 1
Joined: 20 February 2013

### Re: New here

I'm not really into 3-D, except to observe that 3-D tic-tac-toe, unlike 2-D, is a forced win for the first player.

Here's one you've probably already heard:

You are in a room with two doors. One door leads to freedom. The other door leads to a lion who will immediately eat you as soon as you open the door. You don't know which door is which. There are two guards in the room. One of them always tells the truth. The other always lies. You don't know which is which. You are allowed to ask one question of one of the guards. What question should you ask, so that you will know which door you should open?

Bill Smythe
Smythe Dakota

Posts: 563
Joined: 11 February 2006

### Re: New here

You'll love 'The Curse'

This is a riddle from their Valentine special:

Roses are red
Violets are blue

tarek

Posts: 3370
Joined: 05 January 2006

### Re: New here

Assuming that both guards know what's behind both doors, and that each guard knows the false/true nature of the other guard.

Question: Which door would the other guard recommend that I enter?

You then enter the door not in the reply!
daj95376
2014 Supporter

Posts: 2624
Joined: 15 May 2006

### Re: New here

hehe.....beside knowing which door is safe, you should also know which guard is a liar.
the new question is.....
Last edited by 7b53 on Wed Feb 27, 2013 1:19 pm, edited 1 time in total.
7b53
2012 Supporter

Posts: 156
Joined: 01 January 2012
Location: New York

### Re: New here

I doubt very much whether you could find a single question asked of one guard that would tell you both which door is safe and which guard is lying.

Bill Smythe
Smythe Dakota

Posts: 563
Joined: 11 February 2006

### Re: New here

Bill,
I don't even have an answer. but pretty sure there is one, because I clearly remember this problem.
since daj already posted half of the answer(question). we can just concentrate on the other part.
"what question will tell us which is the lying guard".
then try to combine it with daj's answer to figure out the new question.
7b53
2012 Supporter

Posts: 156
Joined: 01 January 2012
Location: New York

### Re: New here

Well, of course you could always ask, "which guard would the other guard say is the liar?" and either guard would point toward the truth-telling guard. This is similar to the original answer. But I still don't see how you could combine both into one question, without making it a compound question, which in essence would be two questions.

Bill Smythe
Smythe Dakota

Posts: 563
Joined: 11 February 2006