I have some questions about gameplay possibilities:
1, is possible to set that only if player holds "A" and "B" he can assault "C"? so when he holds only "A" or only "B" he can not assault "C"?
2, is possible to set up that if he holds only "A" (and can not assault "C") he can bombard "C"? and as in question 1 after he holds also "B" he can assault "C"?
3, when there is continent furled by regions "A", "B", "C" and continent furled by regions "1", "2", "3" the reinforce is possible only between regions with "letters" and only in regions with "numbers"? so when player conquers "A" from "1" he can advanced it, but not reinforce?