I would modify it a little.
ISO no retreat path i would use -> no supply line.
So if you cannot trace a safe path to a factory you should get this problem. Forces the player to also have ships in the SZ after an amfib to keep its forces alive.
Cliffside Bunker House Rules
You can find a complete set of my G40 house rules here…
I have locked this thread, so please direct any discussions there.