In May 1997 Garry Kasparov paced and sweated on a global stage after a chess computer made a move so strange he assumed it saw something beyond human comprehension. It was a bug. This episode treats IBM's Deep Blue as a biographical subject, from a Carnegie Mellon doctoral project called ChipTest in 1985, through Deep Thought's 1989 defeat by Kasparov, to IBM's mandate to build a machine that could beat the reigning world champion.

The episode explains how Deep Blue worked as an expert system: an evaluation function split into 8,000 parts tuned with grandmasters like Joel Benjamin, an opening library of over 4,000 positions, a database of 700,000 games, and 480 custom VLSI chess chips that let it evaluate 200 million positions per second. It covers Kasparov's 1996 comeback through closed positions, the 1997 rematch, the game one random move ...