You are given 21 3x1 rectangular pieces to cover an 8x8 chessboard. Since the board has 64 squares, which square on the chessboard must you cut out so that the 21 given pieces exactly cover the remaining 63 squares? Or it is impossible, no matter which square you remove?

Not a very mathematical answer, and possibly not a correct one, but I was only able to cover the board with the c3, c6, f3, or f6 square removed.

Posted by Joe on 2005-11-12 11:03:45