Thirty years of research has so far failed to produce Computer Chess programs that perform well and behave internally in ways that psychologists recognise as human-like. The task is harder than was realised, but the resulting knowledge gained from trying to solve the problem is all the greater. In this volume, the keynote paper identifies differences between human and computer information processing, and makes the bold prediction that some humans will continue to outperform the world's most powerful computers at chess until at least the year 2000. The other research papers cover a variety of subjects, including mathematical structure, knowledge engineering, search algorithms, psychology, learning, state-of-the-art chess machines, and attempts to bring theoretical clarity to empirical discoveries. MEPHISTO BEST PUBLICATION AWARD: The 1988-89 Mephisto Award for the best publication on Computer Chess was awarded to ``Advances in Computer Chess 5'', edited by Don Beal. The jury consisted of Jaap van den Herik, Monty Newborn, Ken Thompson, Jonathan Schaeffer and Tony Marsland. Don Beal received the latest and most powerful Mephisto Chess Computer in a de luxe wooden board. The ICCA congratulated Don Beal and all the contributors to ``this excellent book''.