It seems to me that the game of Diplomacy sort of centers on Switzerland. That one impassable territory is what defines the dynamics of all who border it, and forms the cornerstone for most stalemate lines. But the thing is, Switzerland isn't really impassable. Sure, it's neutral a lot, but so were a lot of countries, and they got invaded. Sure, it's mountainous, but lots of places are mountainous and still passable. So how would it be if Switzerland, rather than being impassable, was a control center? And, while I'm throwing stuff out there, I feel like Ireland should be a supply center, maybe a British home center.