The newest version of Rebel is challenging grandmaster and nearly world-champion Anand. Programs have ELO-ratings, much higher than most of us can even dream to get close to. Well, this is just my version 0.03 of a chess playing applet.
Related applets play chess variants, and they play it just as bad.
To tell the truth, I actually hoped to make the program a little stronger, but didn't work on that for some time. This only works with Java enabled browsers. Above, you see an applet in working. It plays a game of chess against you. The rook moves automatically with it.