Chinook has a webpage where their computer checker program offers games against the public. They have it set for 3 levels of difficulty. It is EXTREMELY hard to beat. The URL to play it is on this DB several posts back but I will look it up and post it here again. Chinook was one of the original checker programs and has a perfect 8 piece endgame database knowledge. I played it nearly 100 times to get 2 wins and about 8 or 9 draws.