This was the most frustrating diplo game I've ever played.
I met the other continent around 750AD, everyone was soon mad at me for trading with their worst enemy...I thought it was because I was trading with all of them, but then realized it was because Mansa was hated by them all(except Elizabeth). So I bet the bullet, severed all relations with Mansa, and gave up my best trading partner at the time. Everyone had -4 relations for trading with him, and I went no religion the entire game since I founded no religions and Hinduism/Judaism migrated to a single city each.
I teched faster than I've ever done in a GOTM, and built the UN in 1680AD.
Just a few turns before, I had Cyrus +8, Hannibal +9, Stalin +9, Elizabeth +12, Caesar +9...the penalty for trading with the worst enemy had disappeared thanks to ignoring all of Mansa's friendly overtures for almost 1000 years. However, Mansa had been building up his military and I'd been ignoring the military techs...so in 1650AD, when he demanded Physics from me, I acquiesed to prevent him from warring with me...my military was entirely warriors and chariots still.
I had always thought that giving in to a demand didn't count as a trade...I was wrong though, because instantly everyone on the other continent went back to -4 for trading with the worst enemy(except Lizzy) which pretty much lost me my shot at fastest diplo.
Ensuing was the most frustrating diplo game I've ever had. Everyone refused to forget I had given in to his demands...Lizzy became a peaceful vassal to Stalin, and over the course of the next 100 years, I slowly increased my civics bonuses with Hannibal, Caesar and Cyrus...I finally got them all up to voting range again(Hannibal was at +8 and I needed him at +9, Cyrus was +9, Caesar was +8)...and the worst thing that could happen happens...Cyrus discovered Biology and surpasses Mansa in size, making him my opponent rather than Mansa being my opponent. I then almost LOST a diplo victory when Stalin(#3 in pop now) voted for Cyrus and all I had voting for me was Elizabeth(last in pop).
I gifted Biology to Lizzy and she traded it away to both Stalin and Mansa(yay!), and I hoped for my trade modifier to go away and for Mansa to pass Cyrus again...I spent the next 70 years doing that. It never happened. It is now 1890AD, I've almost finished the Apollo Program and only have 3 techs left to research before I'm done with all the spaceship techs.
I take note that Mansa is 25 votes behind Cyrus...so I gift Mansa 3 cities: 1892AD- gift Bursa(size 9)(next to the marble), Konya(size 9)(next to North wine), and Jute(size 13)(on top of north iron)
I then proceed to go blind and not see this message:
"Cyrus switches from Vassalage to Bureaucracy"
That removed my +4 for civics, but I didn't see that message...so when the next vote came, Mansa was largest by 3 votes...but I didn't win because I didn't get Cyrus' votes like I should have...that's when I realized what happened. Of course, the next vote, Cyrus has overtaken Mansa again...and I'm having to watch Mansa farm over the towns I built in those cities
I try switching to Bureaucracy to match Cyrus again, and also switch from Free Market to State Property to get civics points with Stalin. It doesn't work, I gain points with Stalin, lose points with Hannibal, and don't get anything with Cyrus.
In 1925AD, I finish the Apollo Program and all research is done for its parts...so if the next two votes don't work, I decide I'll just go for a mediocre to bad space race victory.
1929AD: I convert back to Vassalage.
1930AD: I convert Cyrus to vassalage in exchange for Plastics, bribe Stalin(and thus Elizabeth) into war with Mansa for Radio, bribe Caesar into war with Mansa for Robotics, and gift Zhou(size 18)(on coast, next to all that Sugar) to Mansa.
I hope that I recover my points with Cyrus, and am preparing for the possible need to war with Mansa for mutual war points with everyone(I can bribe Cyrus and Hannibal if needed once I declare).
That puts Mansa 5 votes ahead of Cyrus, and finally delivers the Diplo win to me in 1932AD. Cyrus, Stalin, Elizabeth, and Caesar all voted for me. I had 490 votes, only 60 of which came from me, now that I've given Mansa 4 large cities.
In Summary:
2 technologically advanced and trading civs will be far advanced over a continent with 5 civs of differing religions(I was behind Mansa when I found the other continent but was 3-4 techs ahead of everyone on the other continent)
It would have been better to switch my Palace to a different city and just gift Istanbul to Mansa, I would have won in the 1700s still.
Don't give in to demands from a worst enemy, it counts as a trade.
Someone better win a diplo pre-1680AD or I'm gonna be very ticked at myself.
My speed ranking is gonna suck for this game lol
Final thought: a cottage powered economy will be more powerful than a resource powered one in the late-game...At 1500AD, Mansa was still the #1 economy, but by 1650AD, Caesar, Hannibal, and me had all passed him in tech and left him behind.
Stats:
1400AD- 550 beaker/turn research
1600AD- 900 beaker/turn research
1750AD- 1500 beaker/turn research