This has absolutely nothing to do with the game of chess! All you need to know is that a chessboard has 64 squares.
It is said that when the game of chess was invented, the king was so impressed, that he promised the inventor a reward, asking him what he wanted. The inventor (being a clever chap) asked for the following. Put one grain of rice on the first square of a chessboard. Then two on the next, and four on the next, and eight on the next, doubling each time, right up to the 64th square. He wanted that amount of rice as his reward for inventing the game. The king laughed and agreed, saying that it was a reasonable request. It wasn't of course!
© Jo Edkins 2012 - Return to Puzzles index