The new edition of this extraordinary book depicts the creation of the world champion checkers computer program, Chinook. In only two years, Chinook had become a worthy opponent to the world champion, and within four years had defeated all the world's top human players. Jonathan Schaeffer, the originator and leader of the Chinook team, details the mistakes and technical problems made and the lessons learned in the continuous effort to improve Chinook's performance, revealing the human factor behind the program's design. The development of Chinook begins in 1988 as an innocent question asked over lunch and is followed to the final match against then world champion, Marion Tinsley, and ultimately to its recent triumph, solving checkers. Schaeffer's unwaveringly honest narrative features new anecdotes, updated material and technology descriptions, and additional photos and figures, providing an engrossing account of an obsessive quest to achieve perfection in computer checkers.