I have made several attempts at "improvements" of standard chess. At
least, they are suitable for training purposes. These suggestions
might prove very valuable in the future, if it becomes necessary to
introduce amendments to chess, due to the incursion of the computer
brain into chess. Please have a look here, on "My variants" (with software) :

http://hem.passagen.se/melki9/chessvar.htm

M. Winther