"The world's most difficult logic puzzle!"

[jack]

"The world's most difficult logic puzzle!"

"As you are walking along a road you come to a cross-roads, at which stand three inhabitants of the island who are unfamiliar with boolean logic and double negatives. One of them..."

:)

(That's a reference to a Raymond Smullyan puzzle that several people have linked to recently, with three gods, who speak an unknown language, and answer truthfully, falsely, or unpredictably, and you have to work out which is which with yes-no questions. I think now I remember enough similar puzzles to know how to do it. Except that I'm sure I remember discussing a specific instance -- probably very similar except for the language irrelevant complication -- on livejournal, probably with simont, but I can't find that discussion now.)

Comments

[scribb1e.livejournal.com]

I'd finished writing for the day, anyway. You just prevented me washing up. I'll blame you if pw201 tells me off :-)

I thought of posting the solution under an lj cut in my own journal but wasn't sure if that would hide it for everyone - don't know enough about how people read lj.

[scribb1e.livejournal.com]

PS I did solve the English version first, but didn't think the generalisation was trivial.