Colossus Chess is a series of chess-playing computer programs developed by Martin Bryant, commercially available for various home computers in the 1980s. Bryant started Colossus Chess in 1983, using his White Knight Mk 11 program, winner of the 1983 European Microcomputer Chess Championship, as a basis. It was developed on an Apple II, but was first commercially released for Commodore 64 as Colossus Chess 2.0 (CDS Micro Systems, 1984) Source: Wikipedia, "[en.wikipedia.org/wiki/Colossus_Chess Colossus Chess]", available under the CC-BY-SA License.