How many squares of any size on this chessboard do not contain a rook?
Puzzle Copyright © Kevin Stone
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Hint
How many 2x2 squares are there?
Answer
There are 93 squares without a rook.
Reasoning
There are 60 squares of size 1x1.
There are 33 squares of size 2x2.
Giving a total of 60 + 33 = 93 squares.
