Oh, hmmm. I'd have to trick another AI into capturing his last city, then capture it later. Which means leaving one AI alive on my continent with only that city... That definitely makes it harder.
Or I could just leave an AI with one worthless city and keep him at war, pillaging him and preventing him from growing/expanding... that might be easier, and should still greatly limit his cultural output.
EDIT: I'm going to give this a shot! I got sick (mixed blessing?) so I have some time to try this. It's going to be tricky.
My big dilemma is that to avoid violating HOF rules, I basically need to trick one AI (say Genghis) into capturing another AI's capital, then capture all of Genghis's cities but that one... and spend the whole game with that city surrounded, preventing him from building improvements, settlers, etc. This way, I can easily capture that city later, liberate the original owner, and culture bomb my only remaining opponent, a guy who should have virtually no culture built up. Yeah.... This will not be easy...
Current plan:
Stage 1) Clear off my continent
* Standard Liberty 3-city CB Rush prioritizing fast NC.
* Wipe out my entire continent, razing every city I don't need, except for one capital that I trick another AI into taking. Somehow.
* If I do this before meeting anyone on the other continent, theoretically there will be no warmonger hit. My neighbor might denounce me but I don't think anyone will care since they never saw me cap any cities.
* Plant an academy with the Liberty closer
Stage 2) Build up a navy
* After Machinery and finishing off my neighbors, save up money and rush-buy universities.
* Mixed Exploration/Commerce, or possibly Exploration/Honor if Statue of Zeus is still on the table.
* Start building as many Galleas as I can as soon as I get Compass.
* Complete Oxford the turn I get Astronomy and bulb Navigation. Buy two caravels to explore.
* I won't be needing other national wonders, so I'll start annexing the good coastal cities at this point as soon as I can rush-buy courthouses.
* As I annex, each city will start building Caravels/Privateers.
* Meanwhile, I'll upgrade all my galleas, and DoW the other continent while the melee ships are being built.
Stage 3) Coastal invasion
* While my frigates destroy all naval resistance, my promoted XBs will swim over with my Privateers just in time to capture. If I time it right, I'll be able to upgrade to Gatlings for the inland cities. Heavily promoted Gatlings with a couple of Knights should mop up the rest pretty fast.
Stage 4) Finish cleaning up the other continent
* Razing everything I don't need, and capturing what I do, I'll eventually be left with only one enemy city on my continent, and one capital on the other continent.
* Liberate the first enemy city back to its original owner (wiping out the captor), then wipe out the last capital on the other continent.
* Somehow, time this with a golden age and the production of my GMs, and immediately music bomb my neighbor. He should have virtually no culture built up after being liberated. So 1-2 GMs should be enough.
If all goes well, t220 victory, or possibly earlier if I play it really well.
Thoughts:
Normally I'd go for 4 cities but I think I'm going to need the happiness headroom and the faster NC. Maybe I'll found a 4th city after NC.
Also, normally I'd bulb a GS with the closer. I typically get around 400 beakers from bulbing, which definitely gets you Machinery faster, but I ALSO need fast Navigation for Stage 2... and possibly Industrialization, because I need to wipe every city off the map, inland or not. So I might get Machinery slower than usual in order to get more long-term tech yield. This means I need to play optimally before t100 to still achieve fast Machinery...
This is a lot of rush-buying, what with the universities and courthouses. So, I'll be pillage-healing my way to glory on this one.
Normally I take Commerce for Big Ben/Mercantilism/etc, but in this case I think Exploration is the way to go. Exploration has +3 production for naval vessels, and I need to be pumping out ships fast, because my turn-to-victory will be determined by how quickly I finish the frigate rush. Plus, I love the happiness in Exploration.
I can't afford to take cities in peace deals... they'll raze down too slowly, and the happiness burden of keeping them may be too much. And I have to take every city. So this is going to be slower than traditional Domination...
I may build 3 factories just for the happiness benefits of 2 bonus Ideology policies. Radio is too much of a tech investment for this plan.
For a t220 victory, normally I would also just go peaceful until a simultaneous frigate/artillery rush, but for this plan to work, I need to take out a neighbor FAST, to cut off his culture gain.
This strategy is a house of cards. It could fail for any number of reasons. But, why not.