From the celebrated "chairman of the board" comes the secrets of strategy that everyone will find useful. -- Be aggressive, but don't take any unnecessary chances. -- Play the board, not the player. -- Answer all threats with a counter-threat. -- When exchanging, always get at least as much as you give up. Crisply and engagingly written, with entertaining examples and chess anecdotes, Every Move Must Have a Purpose will improve your strategic thinking so you'll never again debate your next move.