On February 20 1977, the Minnesota Open chess tournament was won by a computer program, Northwestern University’s chess 4.5. This was a far better result than any program had previously achieved, considering that all the other entrants in the tournament were human beings. An improved version, chess 4.6, went on to wrest the world computer chess championship from the Soviet program kaissa (Jennings, 1978). Professional chess players are beginning to worry about the competition from machines. They would seem to have little to fear at the moment, however. The consensus is that chess 4.5’s tactical skill is impressive but its strategy is weak.
KeywordsLegal Move Game Tree Good Move Force Move Human Player
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