panzerschiff: Yes, not Janus! In Embassy Chess the files A through E are the set up just like regular Chess. When I tried a Queen's Gambit with White a few weeks back it did not work as the Bishops on the courtside are shifted over. The one I'm talking about in this instance does seem to work and the courtside Bishop for Black will come in handy the moment he can move the G file Pawn forward and guard the advanced D file Pawn. Plus if White moves his Knight to E4 Black can move P F7-F5. This make White spend another move. As good as this looks, I still am not sure it's a good thing. I've noticed that pushing the Pawns out in these larger board games can come back to haunt you. Targets for your opponent. It could go like Alekhine's defense sort of, just with the colors reversed.
This opening might work in Grand Chess too. I doubt if it comes up in regular Chess as not too many people would move the Knight there on their second move with White and block the C file Pawn. I don't think it would work in Gothic Chess as the Kings are shifted one square and the check threats need to be there for Black.