The Absent King

Raymond Smullyan devised this puzzle in 1957 while a student at the University of Chicago. The white king has just been knocked off the board during a legal game. Where was it standing?
An idler's miscellany of compendious amusements

Raymond Smullyan devised this puzzle in 1957 while a student at the University of Chicago. The white king has just been knocked off the board during a legal game. Where was it standing?