I dunno, but Deep Blue sure made a fool out of Kasparov. He used to be interested in computer chess, but not after that. He should have played some old Windows 3.0 programs like GNU Chess and Winchess. Those things had amazingly stupid AIs.
Actually, the chess program included with Windows 7 is just as stupid, but the graphics are better.
I remember that Kasparov used to play versus Fritz.
As another poster pointed out, IBM may not have been entirely on the up-and-up in the second match. Also, when Kasparov demanded a rematch, IBM refused and destroyed the computer.