popular series of electronic games (electronic game) for playing chess against a computer; it was originally released in 1986 by the Software Toolworks, which was acquired by the Learning Company. Chessmaster featured extremely competitive artificial intelligence engines—with later versions named “the King”—that challenged all but the most skilled of players and helped bring the game to virtually every make of computer and gaming system over the years. Featuring 2-D and 3-D game play, later versions applied technology from other popular chess games to make Chessmaster a universal favourite.

Early versions of Chessmaster were released for nearly every type of personal computer, including Amiga, Apple II, Atari 8-bit, Atari ST, ZX Spectrum, Commodore 64, Macintosh, and DOS-based machines. Chessmaster 4000 saw the first incarnation of the King, which allowed players to create chess “personalities.” These personalities, which a player would assign to his opponent, could be adjusted down to the smallest detail. By placing certain emphasis on a particular aspect of the game, such as king protection or aggressiveness, players were able to compete in a variety of game types and improve their own personal chess abilities. Personalities could be adjusted to mirror actual players, such as the former world chess champions Bobby Fischer (Fischer, Bobby) or Mikhail Botvinnik (Botvinnik, Mikhail Moiseyevich). In 2002 Chessmaster 9000 even won a game against the reigning U.S. chess champion, Larry Christiansen.