Like I said, the Gorgona, and the Gorgon, are somewhat difficult to master.
So I tested a variety of different paralysing pieces (only orthogonal,
etc,) and came up with the following. Pyrrhus: moves and captures like a
king. In addition, it paralyses any enemy piece within queen-move range.
The Pyrrhus seems to be as valuable as a queen. If this has been invented
before, please tell me. It is a piece which is much easier to master while
it moves at a much slower pace. Yet, its range of influence is that of a
queen. It fits perfectly on an 8x8 board in the standard piece set. But
it's not certain that it's suitable for big-board variants, while it
moves so slowly. I have not tested it on a big board. My Pyrrhus Chess is
here:
http://hem.passagen.se/melki9/pyrrhuschess.htm