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How many squares, of any size, can you find on this chessboard that do not contain a rook?
Puzzle Copyright © Kevin Stone
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Answer
128.
Reasoning
There are 62 squares of size 1 x 1.
There are 41 squares of size 2 x 2.
There are 18 squares of size 3 x 3.
There are 6 squares of size 4 x 4.
There is 1 square of size 5 x 5.
A total of 62 + 41 + 18 + 6 + 1 = 128.
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