So I thought I had a technology victory pretty sewn up... I was all the way to Near Omniscience, which meant only two more stops on the tech tree before sweet victory. The Drengin and the Arceans seemed pretty content to lie back and do their thing, and my military was clearly superior, so I wasn't too worried.
Then it all turned on a dime. An auto-upgrade to some higher-level farms wrecked my economy (in retrospect, that was my big mistake), and then -- the Drengin offer me a sweet trade, they want to give me manufacturing centers! Wow, well who am I to look a gift horse in the mouth? I take the trade.
Too late, I realized that it was a ploy. The auto-upgrade to manufacturing centers double-pronged my economy, and sent it into a spiral from which there was no escape. I desperately tried to backtrack, but it was all damage control... meanwhile the Drengin's cultural influence was spreading fast, and finally they just got tired of toying with me and declared war. They smelled blood, their military had surpassed mine when I wasn't watching, and all of a sudden I'm on the losing side.
Wow, I've never had a game turn around that fast -- victory was in my grasp, and now I have a serious feeling I'm going to get creamed. I have to stop playing for the night, but I doubt there's much hope. Still, I have to admire how craftily the AI screwed me