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 The blurred note (Posted on 2007-04-10)
You get a note from the police station. Unfortunately, it is full of coffee stains.

We have tracked down three suspects for a murder. We know that one of them is guilty and each one of them can be either a knight or a liar. Each one of them wrote a statement or two, but parts of them are full of coffee stains and we are not sure which one of the words in the brackets should be under each coffee stain:

A: ███ (B/C) is innocent. He is also a knight.

B: A is █████ (innocent/guilty). He is also a liar

C: A and B are both ████ (liars/knights)

From these statements, can you figure out who is guilty?

 See The Solution Submitted by Assaf Rating: 4.0000 (4 votes)

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 solution | Comment 1 of 7

B calls A a liar so they must be of opposite types.

Then, since C refers to them as the same type, C must be a liar. So there's only one knight: either A or B.

A calls someone else a knight, so he must be a liar, leaving B to be the knight.

Since A was lying when he called someone a knight, he must have been talking about liar C. Therefore his calling C innocent must be a lie also, and C is guilty.

So B is the only knight and C is the guilty party.

 Posted by Charlie on 2007-04-10 10:52:36

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