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1
Knights and Knaves is a class of logic puzzles set on a fictional island where knights always tell the truth and knaves always lie, formalized by logician Raymond Smullyan in his 1978 book What Is the Name of This Book?
2
Retrograde chess analysis is the art of deducing the history of a chess position from its current state, with the field systematically developed by composer Thomas Rayner Dawson and popularized through journals in the early 20th century.
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