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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

125.

Reasoning

There are 61 squares of size 1x1.

There are 39 squares of size 2x2.

There are 20 squares of size 3x3.

There are 5 squares of size 4x4.

A total of 61 + 39 + 20 + 5 = 125.

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