The Knights and Knaves Classic

On an island of Knights (always truth) and Knaves (always lie), you meet A who says B is a Knight. B says A and I are different types. What are they?

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Quick Answer & Explanation

A is a Knight

The answer to this riddle is A is a Knight. Difficulty: Hard · Solved by 7,712 puzzle lovers.

A is a Knight and B is a Knave. A truthfully says B is a Knight (wrong, but wait...) Actually: If A is Knight, B is Knight, then B says they differ (lie), so B is Knave. Contradiction. If A is Knave, his statement is false, so B is a Knave too. B says they differ - lie, so they are same (both Knaves). Consistent! Both are Knaves.

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