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- Knights_and_Knaves abstract "Knights and Knaves is a type of logic puzzle where some characters can only answer questions truthfully, and others only falsely. The name was coined by Raymond Smullyan in his 1978 work What Is the Name of This Book?The puzzles are set on a fictional island where 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 a particular piece of information.One of Smullyan's examples 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.Maurice Kraitchik presents the same puzzle in 1953 book Mathematical Recreations, where two groups on a remote island – the Arbus and the Bosnins – either lie or tell the truth, and respond to the same question as above.In some variations, inhabitants may also be alternators, who alternate between lying and telling the truth, or normals, who can say whatever they want. A further complication is that the inhabitants may answer yes/no questions in their own language, and the visitor knows that \"bal\" and \"da\" mean \"yes\" and \"no\" but does not know which is which. These types of puzzles were a major inspiration for what has become known as \"the hardest logic puzzle ever\".".
- Knights_and_Knaves wikiPageExternalLink knightsandknaves.
- Knights_and_Knaves wikiPageExternalLink pdf.
- Knights_and_Knaves wikiPageID "273102".
- Knights_and_Knaves wikiPageLength "7098".
- Knights_and_Knaves wikiPageOutDegree "19".
- Knights_and_Knaves wikiPageRevisionID "705067600".
- Knights_and_Knaves wikiPageWikiLink Boolean_algebra.
- Knights_and_Knaves wikiPageWikiLink Category:Logic_puzzles.
- Knights_and_Knaves wikiPageWikiLink Doctor_Who.
- Knights_and_Knaves wikiPageWikiLink Intersection_(road).
- Knights_and_Knaves wikiPageWikiLink Knight.
- Knights_and_Knaves wikiPageWikiLink Labyrinth_(film).
- Knights_and_Knaves wikiPageWikiLink Liar_paradox.
- Knights_and_Knaves wikiPageWikiLink Lie.
- Knights_and_Knaves wikiPageWikiLink Logic_puzzle.
- Knights_and_Knaves wikiPageWikiLink Maurice_Kraitchik.
- Knights_and_Knaves wikiPageWikiLink Pyramids_of_Mars.
- Knights_and_Knaves wikiPageWikiLink Raymond_Smullyan.
- Knights_and_Knaves wikiPageWikiLink The_Hardest_Logic_Puzzle_Ever.
- Knights_and_Knaves wikiPageWikiLink Truth_table.
- Knights_and_Knaves wikiPageWikiLink Yes–no_question.
- Knights_and_Knaves wikiPageWikiLinkText "Knights and Knaves".
- Knights_and_Knaves wikiPageWikiLinkText "one of whom can only lie, while the other can only tell the truth".
- Knights_and_Knaves wikiPageUsesTemplate Template:Reflist.
- Knights_and_Knaves wikiPageUsesTemplate Template:Unreferenced_section.
- Knights_and_Knaves subject Category:Logic_puzzles.
- Knights_and_Knaves hypernym Puzzle.
- Knights_and_Knaves type VideoGame.
- Knights_and_Knaves type Redirect.
- Knights_and_Knaves comment "Knights and Knaves is a type of logic puzzle where some characters can only answer questions truthfully, and others only falsely. The name was coined by Raymond Smullyan in his 1978 work What Is the Name of This Book?The puzzles are set on a fictional island where 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.".
- Knights_and_Knaves label "Knights and Knaves".
- Knights_and_Knaves sameAs Q1548905.
- Knights_and_Knaves sameAs Ritter_und_Knappen.
- Knights_and_Knaves sameAs Cavalieri_e_furfanti.
- Knights_and_Knaves sameAs m.01n_pc.
- Knights_and_Knaves sameAs Задачи_о_рыцарях_и_лжецах.
- Knights_and_Knaves sameAs Лицарі_та_Шахраї.
- Knights_and_Knaves sameAs Q1548905.
- Knights_and_Knaves wasDerivedFrom Knights_and_Knaves?oldid=705067600.
- Knights_and_Knaves isPrimaryTopicOf Knights_and_Knaves.