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#1 schmod54

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Posted 07 February 2008 - 02:39 PM

In the Land of Knights and Knaves [LKK], Knights told the truth, and Knaves always lied. When the rare averitas flu virus infected some of the inhabitants, their behavior was reversed: sick Knights began to lie, and infected Knaves had to tell the truth!

Your job is to find out the ones who have been infected so they can be given the costly AFV vaccine. Just as you've finished with the previous group (or even if you're not finished... too bad, they're here anyway ;)), another group of five LKK citizens barge in. Here's what they have to say:

Vlad: Zedekiah is a knight as much as I am.
Wally: Vlad is a liar! He's a knave. I'm a knave too.
Xavier: If there are an odd # of knights in this group, then I need a shot, otherwise, I'm a knave.
Yitzhak: I'm a knave.
Zedekiah: Don't trust Yitzhak, he's lying! Trust me, I'm a knight!

Well, at least you know their names. Who needs a shot, and who doesn't?

Special thanks to bonanova for the puzzle format and introductory text.
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#2 bonanova

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Posted 07 February 2008 - 07:39 PM

Spoiler for I got 4 out of 5

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The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#3 octopuppy

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Posted 10 February 2008 - 12:33 PM

Spoiler for ANSWER

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