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CHESS 4.6

Chess computer program written at Northwestern University by David Slate and Larry Atkin.  In February 1977, it won the Minnesota Open Championship.  In August 1977, it won the second World Championship.  In September 1977, it achieved  a 2000 rating in a tournament in London.  On September 18, 1977 it was the first computer to beat a grandmaster when it defeated GM Michael Stean in London.

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