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Difficulty: MediumPuzzle Details

How many squares, of any size, do not contain a Rook?

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[Ref: ZRZL] © Kevin Stone 

Answer: 128.

There are 62 squares of size 1x1.
There are 41 squares of size 2x2.
There are 18 squares of size 3x3.
There are  6 squares of size 4x4.
There is   1 square  of size 5x5.

A total of 62 + 41 + 18 + 6 + 1 = 128.


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