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

Source Work

1932: Henry Ernest Dudeney: Puzzles and Curious Problems:

Moving Counter Problems

$247$. -- The Counter Cross

1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems:

Geometrical Problems

Triangle, Square & Other Polygon Puzzles

$285$. 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.

Correction

He missed two.

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

Sources

• 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Solutions: $247$. -- The Counter Cross
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $285$. The Counter Cross