Chessboard

Question:

You have an 8 by 8 chessboard that has two corner squares diagonal from each other removed. Is there any way to place 31 dominoes of size 2×1 to cover the remaining 62 spaces?

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C

A

P

T

A

I

N

I

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E

R

V

I

E

W

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Solution: No. When you remove the two diagonal spaces from the chess board they are both black or both white, making it so that there are two more of the other color. Each domino would cover 1 black and 1 white space. So 31 of them would have to cover 31 white spaces and 31 black spaces but with the corners removed there are 30 of one color and 32 of the other.

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