Knights and Knaves

[knolan]

On a fictional island, all inhabitants are either knights, who always tell the truth, or knaves, who always lie. The puzzles involve a visitor to the island who meets small groups of inhabitants. Usually the aim is for the visitor to deduce the inhabitants' type from their statements, but some puzzles of this type ask for other facts to be deduced. The puzzle may also be to determine a yes/no question which the visitor can ask in order to discover what he needs to know.

An early example of this type of puzzle involves three inhabitants referred to as A, B and C. The visitor asks A what type he is, but does not hear A's answer. B then says "A said that he is a knave" and C says "Don't believe B: he is lying!" To solve the puzzle, note that no inhabitant can say that he is a knave. Therefore B's statement must be untrue, so he is a knave, making C's statement true, so he is a knight. Since A's answer invariably would be "I'm a knight", it is not possible to determine whether A is a knight or knave from the information provided.

In some variations, inhabitants may also be alternators, who alternate between lying and telling the truth, or normals, who can say whatever they want. They are known as spies.



1. (1 Knight, 2 Knaves)
Joe: bill is a Knave.
Bill: I am a Knight
Henry: Joe is correct


find out Who joe, Bill, and Henry are.


Post or PM some more guys!

[XPretzelman]

henry and joe are knaves

[carpjr]

Henry and Joe are the knaves and Bill is the knight.