Continuing with my Contender save report. As I said in the First Spoiler, it wasn't likely that I'd be in competition for a fastest finish, so I was planning to drag the game out for a cow. I was particularly intrigued by the restricted victory conditions of this game, which would allow me to conquer all of the AI without ending the game.
Sury declared war on me in 200. I conquered all of his cities by 1100. The Inca were my next target, attacked in 1160 and conquered by 1430.
At this point, Joao and Willem were pleased with me, while Sitting Bull was cautious. Given the longer shared border, I was leaning towards attacking Joao next. That was when Joao offered to peace vassal to me, in 1440. I debated whether to accept his offer. In the long term, it would interfere with my plan for total conquest, but having a trading and research partner would speed up my spaceship research. And there might still be ways...
I accepted Joao's vassalage, and we went to war with Sitting Bull. When he offered to capitulate, I rejected the offer and pushed on to complete his conquest in 1590. Then we went to war with the Willem, conquering the Dutch by 1655. During this time, two of the cities I had captured (one Khmer, one Native American) revolted to the Portuguese, which annoyed me. Then Joao captured Maastricht from the Dutch (I neglected to order a diversion of his attack until he was on the verge of capturing it), which annoyed me some more.
We invaded Japan and conquered it by 1710. If the victory condition had been enabled, a Conquest victory would have been achieved on this data (with Domination coming somewhat sooner). But by the rules of this game, I continued with the space race. My space ship was completed in 1840...and then I let it sit on the lauchpad, as I worked on the cow. I had founded Sid's Sushi in 1655 and Mining, Inc. in 1700; I spread these to all of my cities.
And, with nothing much else to do, I started sending spies into Portuguese territory to spread my culture. It was a slow and tedious process, but I hoped to get those cities to revolt to me. And if captured spies annoyed Joao enough, he might reject his peace-vassalage, in which case I could go to war and sweep him aside.
It was a
very slow and tedious process.
Joao agreed to liberate the two cities that had revolted to him. Then, after a long, long time, his own cities began revolting to me. As for my failed spy missions, it was a remarkable case of Joao deliberately choosing not to notice something that he did not want to notice.
A net relationship of
-49 (pushed up to -50 on the final turn), and Joao was still
Friendly!
Now, I hadn't been closely following the discussion about using espionage to achieve a cultural victory, but in this game I inadvertently discovered the basic concepts. Guimares revolted to my side in 1947, and I discovered that it was now my #2 cultural city. Oporto revolted in 1949, and I discovered that it was
already at Legendary culture! Approaching the cultural victory conditions, I decided to finally launch my spaceship in 1956, with the plan of using a GA to nudge Guimares to Legendary and thus achieve a simultaneous spaceship/cultural victory on the last turn.
And then, in 1965, with the spaceship one turn away from Alpha Centauri, came a diplomatic message I'd never seen before. Joao offers to give Lisbon to me "as a sign of his respect". And when I accept, I see that I've really been pumping a lot of culture into that city!
On the next turn, the world celebrates the unveiling of Lisbon as the epitome of Ethiopian culture by handing me a Cultural Victory.
And, overlooked amidst the celebrations, my spaceship arrives at its destination.
So...I don't know if it was worth all the playing time, but that was entertaining.

I recognize that I've left off more than 80 years of further future teching (at the rate of one tech every turn), so there's an opportunity for someone to raise a fatter cow. I'll just have to wait for the results, now.