Two friends and I built this when we were still learning how to
program. It's still in use today! See the demo. More
Checkers program. I spent most of 1999 playing with this :-) I lost the sources. This review says: "The author calls his program 'very strong' and that is somewhat understated. While it isn't world class, it certainly plays very well indeed." It works with Wine.
Compare the speed of floating point operations with different
setups (Kernels, compilers, etc).