Prior to building the supercomputer Deep Blue that defeated Kasparov, Feng-hsiung Hsu worked on many other chess computers. He started with ChipTest, a simple Chess-playing chip much different than the other Chess playing computer being developed at Carnegie Mellon, Hitech, which was developed by Hans Berliner and included 64 different chess chips. Feng-hsiung Hsu went on to build the successively better Chess playing computers Deep Thought, Deep Thought II, and Deep Blue Prototype.