Schach

Schach is a chess program initially written in FORTRAN (version 1), later ported to ALGOL (version 2) and x86 assembly for DOS (version 3). Version 1 played in three American computer chess tournaments (1970, 1971 and 1972). Version 2 played in six World Computer Chess Championships between 1980 and 1986. Version 3 played multiple local European championships and international computer chess and microcomputer chess tournaments between 1991 and 1997.