It's hard to believe that it's been over a decade since One Jump Ahead: Challenging Human Supremacy at Checkers was published. I'm delighted to have the oppor- nity to update and expand the book. The ?rst edition ended on a sad note and that was re?ected in the writing. It is now eleven years later and the project has come to a satisfying conclusion. Since its inception, the checkers project has consumed eighteen years of my life-- twenty if you count...