General
The "I Am a Knave" Riddle: Can You Solve It?
On the island of Knights and Knaves: knights always tell the truth and knaves always lie. If a person says I am a knave, what must this person be?
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What is the answer to the "I am a knave" knights and knaves riddle?
The person cannot be classified — the statement is a logical paradox. A truthful knight could never say "I am a knave" because that would be a lie, and a lying knave could never say it because that would be true.
Why is "I am a knave" a paradox?
Both options break the rules. If a knight said it, the knight would be lying (impossible). If a knave said it, the knave would be telling the truth (also impossible). So no valid speaker can make the statement.
What are knights and knaves in logic puzzles?
Knights and knaves are characters from classic logic puzzles by Raymond Smullyan. Knights always tell the truth, and knaves always lie. You deduce who is who from what they say.