Journal of Philosophical Logic 30 (6):609-612 (2001)

Abstract
"The Hardest Logic Puzzle Ever" was first described by the late George Boolos in the Spring 1996 issue of the Harvard Review of Philosophy. Although not dissimilar in appearance from many other simpler puzzles involving gods (or tribesmen) who always tell the truth or always lie, this puzzle has several features that make the solution far from trivial. This paper examines the puzzle and describes a simpler solution than that originally proposed by Boolos
Keywords Boolos  logic puzzle  Smullyan  true/false
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Reprint years 2004
DOI 10.1023/A:1013344220298
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The Hardest Logic Puzzle Ever.George Boolos - 1996 - The Harvard Review of Philosophy 6 (1):62-65.

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On the Behavior of True and False.Stefan Wintein - 2012 - Minds and Machines 22 (1):1-24.

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