[chbot] chock fish answer - ** spoiler **

[Charles Manning]

...or you take the sister with you and tell her that if the car runs out of
petrol  she has to push the car!


On Sat, Dec 6, 2014 at 11:31 PM, Volker Kuhlmann <list0570 at paradise.net.nz>
wrote:

> On Sat 06 Dec 2014 19:45:56 NZDT +1300, Mark Atherton wrote:
>
> > Ask "which fork would your sister tell me to choose"
> >
> > Either sister should respond with the incorrect branch.
>
> Key is to ask the other sister. I see this as two single-input logic
> gates in series. The honest sister's is non-inverting, the lieing
> sister's is inverting. The result is the same regardless of which one is
> first, and the answer is inverted. This is why I didn't think it's
> complex or compound. There are several ways to phrase the question.
>
> It reminds me of another riddle:
>
> A pretty maiden is held prisoner by a bad king. Walking through the
> court yard, covered in black and white stones, she says "it's boring
> here, I want out". The king responds "OK, I'll put a black and a white
> stone in a bag, and you can pick one. If it's the white one, I'll let
> you go". She observes the king putting two black stones into the bag.
> How does she get out?
>
> She takes one stone, and without anyone seeing it, drops it. Then she
> laments "how really foolish of me, but I have an idea: let's just look
> at the other stone".
>
> Key is again to ask one about the other, making the result dependent on
> both. Never mind the story.
>
> Volker
>
> --
> Volker Kuhlmann
> http://volker.top.geek.nz/      Please do not CC list postings to me.
>
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