Two Weird Tricks Your Ai Doesn't Want You To Know

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i was playing eu4 today and came up with two cute ideas:

1. let your enemy pass through your lands to fight a foreign power far away, then revoke permission half-way through the war, cutting off reinforcements

2. hover your stack of warships over the enemy's. move them into a port, and when the enemy comes out, smash them.

bonus: in eu4, allies will get a huge relations penalty if you don't give them something in the peace treaty after a war