Further research on Tech Stealing
One issue that has been nagging at me was this, in bcool's test, Roosy was able to help with a number of techs:
The problem is, we can't easily get Roosy to Friendly and we want his monopoly techs, so we need to steal them, but he's too far away, so they're REALLY EXPENSIVE to steal. Now, he's got too many cities, so we can't gift him Moscow-2S1SW, but we don't want to bash him down to 3 cities, because that nerfs his ability to research useful techs. Luckily, Silu gave us the answer in SG11:
I tested this. On the very same turn, we can gift Roosy a chain of cities, one by one, from his nearest city to some city close to us that we don't care about and bingo, we can steal techs cheaply form him, all we want.
Below are two test examples. Open the first one up, gift Roosy Novgorod, then gift him St. Petersburg, then steal 4680

Constitution for 514

.

In the second test, I tested two things: 1) Gifting Stalin an iceball city (Rostov) with Buddhism, so he'd adopt that religion, which he did. Then I gifted him Yaroslavl' to steal 4680

Mil Sci for 421

; and the other thing I tested was 2) to see if he'd teleport his nukes. He didn't. My plan, though was to monitor Rostov each turn, and if he transported the nuke, capture the city with my chariot, before he could launch it...
And while you're at it, keep in mind that a sci gives us 6

, while a spyspec gives us 4

+ 4

(+ 3.5gpt and increasing for the ch in that city...)