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  Spatial Awareness

Exactly Two
 
Q

Draw a grid made up of six horizontal squares and six vertical squares.

The grid will have 36 squares. Place 12 pennies on the grid, one to a square, so that each of the six horizontals, each of the six verticals, and each of the two diagonals contains exactly two pennies.


 
A

Here are three solutions. Are there more?

Solution 1
 
Solution 2
 
Solution 1
 
Based on a puzzle inMore Puzzles for Pleasure and Leisureby Thomas L. Hirsch. New York: Abelard-Schuman, 1974.