In Space Travel the player is free to explore the solar system. The game uses a two dimensional scale model of the solar system and the player is free to fly around. Physics are simplified as the player is only affected by the single strongest pull at a given time. There are no explicit objectives in the game, but the player can navigate around the solar system and attempt landings on planets and moons. The space craft can be moved and turned and the simulation speed can be increased to quickly reach destinations.
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.