---
tag: YJ50GEXEVR
kind: statement
role: proposition
name: Identity alone
sources:
  - wikipedia: en:273102@r1371398723
    locator: Knights and Knaves, section Examples > Identity alone
    note: adopted
    mention: wikipedia://en/273102#CJR7
    sections: [Statement]
inventory: [3YWNHMT6YZ]
---

## Statement

If all one wants to know is whether someone is a knight or a knave, this can be tested by simply asking a question to which the answer is already known. In the film *The Enigma of Kaspar Hauser*, a character solves the puzzle of whether a man is a knight or a knave by suggesting asking the man "whether he was a tree frog".