Chess Ver.4.x © 1973 Atkin & Slate.
Updated version of the chess game for the CDC 6600 computer.
The game won the ACM North American Computer Chess Championships eight times and the second WCCC in Toronto in 1977.
Ver.4.0 (1973)
Ver.4.2 (1974)
Ver.4.4 (1975)
Ver.4.5 (1976)
Ver.4.7 (1977)
Ver.4.9 (1979)
Programmed by: Larry Atkin, David Slate