Encirclement Rule (modified)
First off, I already see that someone has suggested an encirclement concept.
But this is a slight modification of that idea that may make it easier to implement.
Encirclement Rule: You are forbidden to deploy reinforcements in territories (note the plural) that do not have a connection (a link through either your territories or your teammates' territories) to a bonus that you or your teammates control completely.
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NavyAir commented
It's interesting but how would it work during the first few turns when you don't have any full bonuses?
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Canadian Indiana commented
or, hear me out, you can't deploy in territories that do not connect to your original picks. If you lose picks aka (supply bases/capitals) you lose ability to deploy and can only fight with what you have or are gifted.
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anonymous commented
ALSO, this "Encirclement" feature should be able to be toggled on and off.