Keys "s"=save "l"=load "b"=back once
Proprietary game by David Moeser, 1970.
A similar proprietary game, Hyperchess, by Dr. Ernest Groman and Daniel Jacobson, from the same era, went through two versions with different pawn rules. For now, pawns promote only to queens.
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!