Cartesian: http://www.chessvariants.org/other.dir/ultima.html

Your link has a bracket on the end of it and messes up where it sends you.

Utlimamen versus Chessmen is just that. One player gets Chessmen and the other plays with Ultimamen. Chessmen are very strong against the Ultimamen. The Immobilizer is an exception. Even though it can't capture a piece, I feel it is stronger than the Queen. Chamelions are pretty strong against the Chessmen too, though you have to agree to whether they can take Knights or not. It seems that the few times I played this game we didn't allow them to capture Knights as they couldn't move like them. IF the game was played more often and win and losses got too onesided in favor of the Chessmen, you could allow them to capture Knights as one way to attempt to balance the game. We also played that the Ultimamen could move as far as they wanted too, like in the original version of Ultima.