īy the mid-2000s, engines had become so strong that they were able to beat even the best human players. 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. Edwards released the Portable Game Notation (PGN) specification. Tim's answer formed the basis for what became known as the Chess Engine Communication Protocol or Winboard engines, originally a subset of the GNU Chess command line interface. He wanted to focus on the chess playing part rather than the graphics, and so asked Tim Mann how he could get Junior to communicate with Winboard. In 1994, Shay Bushinsky was working on an early version of his Junior program.

In his characterization, commercial chess programs were low in price, had fancy graphics, but did not place high on the SSDF ( Swedish Chess Computer Association) rating lists while engines were more expensive, and did have high ratings. By early 1993, Marty Hirsch was drawing a distinction between commercial chess programs such as Chessmaster 3000 or Battle Chess on the one hand, and 'chess engines' such as ChessGenius or his own MChess Pro on the other. In December 1991, Computer-schach & Spiele referred to Chessbase's recently released Fritz as a 'Schach-motor,' the German translation for 'chess engine. By 1990 the developers of Deep Blue, Feng-hsiung Hsu and Murray Campbell, were writing of giving their program a 'searching engine,' apparently referring to the software rather than the hardware. In 1986, Linda and Tony Scherzer entered their program Bebe into the 4th World Computer Chess Championship, running it on 'Chess Engine,' their brand name for the chess computer hardware made, and marketed by their company Sys-10, Inc. The meaning of the term 'chess engine' has evolved over time.

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