My proposal is to enhance orthochess by a relocation procedure, whilst
retaining the castling right, and keeping the option to play the
standard position. This could be ideal for training. See the following link
to an article with diagrams, and programs that implement these changes:
http://home7.swipnet.se/~w-73784/chess/relocationvariants.htm(Sorry, only in English and German)
Mats