command line interface.

Also in 1994, Stephen J. Edwards released the Portable Game Notation (PGN) specification. It mentions PGN reading programs not needing to have a "full chess engine." It also mentions three "graphical user interfaces" (GUI): XBoard, pgnRead and Slappy the database.

By the mid-2000s, engines had become so strong that they were able to beat even the best human players. Except for entertainment purposes, especially using engines

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