Well @
MarleysGh0st - nice to see I wasn't the only one:
1906 AD Diplo loss to the Netherlands. And it was so close! I was literally 1 turn away from the final spaceship part so I could launch. And the worst thing was - I could see it coming, but couldn't see anything I could do about it: Willem had basically vassaled just about everyone except me, and since narrowly losing a diplo victory vote some time previously, he'd added Wang Kon to his vassal list. It was obvious what was going to happen. It was just a question of, could I reach alpha centauri before he called another diplo victory vote. In the end, I couldn't.
Back to 1AD, I was at war with the Vikings. I spent much of the next thousand years continually swapping between Joao and Ragnar wars, taking a little bit more land with each war. Unfortunately Joao eventually put a stop to that by vassaling to the Netherlands - and the Netherlands were already just too big and powerful and advanced for me to even consider a war with them. Eventually Ragnar also vassaled - to France. France were less powerful, but I was still forced to abandon the war and tech to cannons before restarting it in 1300AD. There was then a slow process of gradually destroying the Vikings and taking a bit of French land before France vassaled to the Netherlands.
That war was awful for science. I ended up with about 18 war weariness per city, which meant I had to run 50% culture, 50% gold and I was still losing money! As soon as the war ended in about 1600AD, my science jumped very quickly to around 2000 bpt. Maybe I should've ended it earlier!
In the meantime Willem had also gone to war with - and vassaled - Sumaria and had a massive tech lead, so by then there was even less chance of a war with him. So I just pumped everything into science in the hope of beating him to space. I had a couple of lucky breaks, thanks to Willem not apparently being focused: He didn't beeline plastics, which meant I was easily able to build the Three Gorges Dam, despite his overall lead. And I managed to get the Internet, which basically immediately eliminated his lead. First time I've ever found the Internet useful! By 1900 AD I was well ahead, and would have easily reached Alpha Centauri first. But the voting power from all Willem's vassals was too much.
In one final twist, towards the end of the game Joao regained his freedom, and a couple of turns before the end, declared war on me, which caused some concern because my Three Gorges city was Lisbon! - right in the war zone. I think I would have prevailed, but I never got the chance to find out.
I suspect in the end my key mistake was keeping the war with France going too long. If, instead, I'd taken him as a vassal as soon as he was willing to capitulate, Willem probably wouldn't have been able to get the diplo win votes and I'd have been OK. And since both the cities I'd captured from France subsequently flipped back, I didn't get any extra land in the end. But hey, isn't hindsight wonderful!