Chess X.x (1968-1978)
In the 1968, Northwestern University students Larry Atkin, David Slate and Keith Gorlen started the program Chess. On July 25, 1976, Chess 4.5 scored 5-0 in the Class B (1600–1799) section of the 4th Paul Masson chess tournament in Saratoga, California. This was the first time a computer won a human tournament. Chess 4.5 was rated 1722. Chess 4.5 running on a Control Data Corporation CDC Cyber 175 supercomputer (2.1 megaflops) looked at less than 1500 positions per second. On February 20, 1977, Chess 4.5 won the 84th Minnesota Open Championship with 5 wins and 1 loss. It defeated expert Charles Fenner rated 2016. On April 30, 1978, Chess 4.6 scored 5-0 at the Twin Cities Open in Minneapolis. Chess 4.6 was rated 2040.
Read more about this topic: Human-computer Chess Matches
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