Henry Ernest Dudeney/Puzzles and Curious Problems/247 - The Counter Cross/Mistake

Source Work

 * Moving Counter Problems
 * $247$. -- The Counter Cross
 * $247$. -- The Counter Cross


 * Geometrical Problems
 * Triangle, Square & Other Polygon Puzzles
 * $285$. The Counter Cross
 * $285$. The Counter Cross

Mistake

 * There are $19$ different squares to be indicated.
 * Of these, nine will be of the size shown by the four $\text A$'s in the diagram, four of the size shown by the $\text B$'s, four of the size shown by the $\text C$'s, and two of the size shown by the $\text D$'s.


 * Dudeney-Puzzles-and-Curious-Problems-247-solution-error.png

Correction
He missed two.

These can be found in the analysis in the solution given.