Lambik: The www.superchess.nl link worked fine. I went there, but it doesn't really have much in the way of how the game is played aside from saying you play it just like regular Chess after the pieces are set up during the prelude. Nor does it mention the Emperor being a second piece to have to threaten, nor any of these other powers you guys have been talking about. It just mentions adding some pieces at the begininng of the game and playing it just like regular Chess from there. It sounds as if this Superchess has been evolving on its own elsewhere. Deciding which pieces are allowed is half the game as far as playing it is concerned. IT also only mentions playing on a 8 × 8 board, but I see no reason that a different sized board couldn't be used.
As for playing on this site. Fencer's plan of having the creator make the game and then the person wanting to play would accept the set up and rules or not play will work, though it will eliminate negotiation for a tournament. It will have negotiation for games between to individuals though. As the invitee won't accept and start the game until some of his wants are addressed. This will force either player to create a new game and again have it reviewed and accepted by the other.