Tell

An early chess program by Johann Joss, a Swiss mathematician and Ph.D in mathematics from the ETH Zurich, who already started chess programming in 1967 on a CDC 1604 A. It played the first two World Computer Chess Championships, the WCCC 1974 in Stockholm and the WCCC 1977 in Toronto, and won the first German computer chess tournament, the First GI Computer Chess Tournament, in 1975 in Dortmund. Tell was a small and fast searcher for that time, running on HP 2100, HP 2115 minicomputers, three to eight plies deep with around 100.000 nodes in three minutes.

(Source: https://www.chessprogramming.org/Tell)