So, I started doing this in response to when you kinda know a couple AI civs are about to declare war on you (you know they line up all their troops on your borders). Initially, I would diplo the target AI, trade all my resources (luxury and strategic) for as much gold as I can get. Then declare war on them, then, move on to the next target AI. I was getting a decent amount of gold normally, enough to rush buy a few extra units. Then I decided to take it the next level, if I was getting all their gold I would see who they would go to war with and choose the ones I could afford that would be largest threat to them (point value and proximity). And finally, when I decided to use my GPT to maximize their suffering. This was best done when I was in a golden age, and even more so if I set the cities I controlled to gold focus. By trading all my GPT I was able to get significantly more out the AI (gold/wars). So, I was doing this with every AI civ regardless of whether they were hostile or not. I was able to generate a large amount of gold and use that gold to purchase a large amount of units for the defense. What would happen pretty much every time is that most of the AI wouldn't engage my borders for very long or at all (even the ones within proximity). In 10 or so turns pretty much everyone would offer a peace treaty and some would even surrender gold to me as well (even though I had not entered their borders). I would accept peace with everyone unless it was someone I wanted to take land from at the time. Somethings that I noticed: I believe this caused tensions to rise between other AI civs permanently. There was time where an AI civ would only want open borders to declare war on another CIV. The AI civs peace offerings seemed dependent on your army value (see the diplo screen). If you had no army they wouldn't offer peace or ask for stuff from you, if you had a large army value they would at the very least offer straight peace. Some AIs are very difficult to get to declare war like Ghandi. Some AIs will not declare war on a given CIV for any amount of money that one could possible hope to have (500GPT?) AI civs really value their cities, I think on the few occassion I tried, (and I stopped cause it wasn;t worth the effort). To get a 5 pop citiy that had no resources and was in quite possibly the most horrible spot I had to trade like 300GPT for. They when I tried to sell to another AI civ I think they most I got for it was like the equivalent of 5 like GPT. In the I actually use diplo to have AI civs declare war on each other to protect myself (at I think it helps) without declaring war right back at them (IE I can't afford to be in any war period). Just wanted to share some of the shadyness that I've used to get through some games. I does show the brokenness of GPT and resources. I can only assume this is how the devs intended the game to be played otherwise they should simply lock the gpt and resouces until times up.