 The ITEP group was advised by Russian chess master Alexander R. Bitman and three-time world champion Mikhail Botvinnik.According to the Computer History Museum, McCarthy "used an improved version" in 1967 but what improvements were made is unknown.In 1967 Mac Hack VI by Richard Greenblatt with Donald E. Eastlake III became an honorary member of the United States Chess Federation when a person lost to it in tournament play in Massachusetts.