This chess-playing machine was part robot: Magnets underneath moved real pieces for the computer, and the pressure-sensitive board could detect the human player’s move. The software, designed by chess expert David Levy’s company, was considered weak in the opening and closing, but a strong middle game earned it a 1550 chess rating. The game was marketed internationally — as “GrandMaster” in the U.S., “Phantom” in the U.K., and “Milton” in Germany and France. Cost: $500.