Henry Ernest Dudeney/Puzzles and Curious Problems/342 - A Wily Puzzle/Solution

by : $342$

 * A Wily Puzzle

Solution

 * Dudeney-Puzzles-and-Curious-Problems-342-solution.png


 * In the diagram it will be seen that the prisoner's course is undoubtedly all right until we get to $b$.
 * If we had been the prisoner, when we got to that point we should have placed one foot at $c$, in the neighbouring cell,
 * and have said, "As one foot has been in cell $c$ we have undoubtedly entered it,
 * and yet when we withdraw that foot into $b$ we do not enter $b$ a second time,
 * for the simple reason that we never left it since we first went in."