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Schach – Mainframe – 1968

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 the 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.

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Qubic – Mainframe – 1968

Qubic is a three dimensional Tic Tac Toe game written in BASIC. It was later collected in the book BASIC Computer Games. The game plays like Tic Tac Toe except instead of a 3×3 board there’s a 4x4x4 board and the player and computer must try to get four in a row. The player decides if he goes first or second.