Keys "s"=save "l"=load "b"=back once
Mr. den Oude, Dutch, 1988. Packaged and distributed. No pawn-two; just after its first move, a pawn may be captured by an adjacent hostile pawn. Promotion only to previously captured piece. Castling permitted. Bare king loses.
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!