This is one of the most interesting, most unusual and most instructive chess books ever written. It is the combined work of seven of the world's strongest grandmasters: Larry Evans, Paul Keres, Svetozar Gligoric, Vlastimil Hort, Bent Larsen, Tigran Petrosian and Lajos Portisch. What makes this book especially great and useful is that each of these seven grandmasters had vastly different styles. For example, Bent Larsen used wild, unorthodox attacking lines, whereas Petrosian, who was capable of attacking when he wanted to, preferred to sniff out his opponent's chances and wait for the opponent to attack unsoundly and fall upon his own sword.