Thanks for your explanations, I didn't know that. This abbreviated notation makes sense.
The moves "B b5-b3" and "B b3-b5" you mentioned as examples are not legal moves in my variant. With the exception of the rules for the new squares 4 and 5 and for the switches 4/a4 and h5/5, the FIDE rules are valid exclusively.
Thanks for your explanations, I didn't know that. This abbreviated notation makes sense.
The moves "B b5-b3" and "B b3-b5" you mentioned as examples are not legal moves in my variant. With the exception of the rules for the new squares 4 and 5 and for the switches 4/a4 and h5/5, the FIDE rules are valid exclusively.