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Drop variants[Subject Thread] [Add Response]

H. G. Muller wrote on Fri, Sep 19, 2014 10:44 AM UTC:

I am looking for a compact way to describe the rules of Chess variants. For
the moves of pieces (extended) Betza notation is ideal. But in variants
with drops it does not tell you anything about which drop moves would be
allowed, and which forbidden.

So I am looking for a sufficiently general way to encode rules for dropping
pieces. Pertty common restrictions are:

*) You cannot drop a piece in a place where it can never have any legal
moves (Shogi P, N and L, Crazyhouse P)

*) You cannot drop a piece on a square where it could not otherwise go
(Crazyhouse P)

* You cannot drop a piece in a file where there already is one (Shogi P)

* You cannot drop a piece in a file where there already are two (Tori Shogi
Swallow).

Do there exist any other variants that have special requirements for drop
rules other than those listed above, that a general description method
should be able to handle?