There are a few things that need to be pointed out here...
> Is culture win when EITHER of these things happen:
> A- culture is 2x second best, {no worries on that score}, or
> B- culture score => 100000
No. Culture win occurs when:
1. 20,000 culture in one city. Period.
2. >100,000 culture *AND* total culture > 2*second best
> Communist gov't type will allow the far off cities to be at least
> marginally productive while decreasing the productivity of the
> core cities only marginally.
Not really, the *percent* increase in productivity in far flung cities will go WAY up, while the corruption in your best towns may drop greatly, but that depends on total number of cities.
Unless you plan for it and are building an empire suitable for communism, your civ's total shield output goes down a fair amount, and the cash is likely to plummet.
> Isn't the point about corruption in communism that only the
> distance from your Capital/FP is constant?
> IIRC, you still suffer from the # of cities, and that will never change.
No, the point about communism is that corruption is shared equally around the empire, and only the number of cities (compared to the optimal number) matters.
The *WAY* you suffer from # cities varies greatly. For other govts, the effect of number of cities is that corruption depends on the number of cities closer than a given city, divided by the OCN, is key in determining corruption. So beyond a certain distance (not a fixed distance, but really, beyond a given number of cities closer) you get 'ultracorrupt' 1 sheild cities. Inside that distance adding more cities has virtually no impact on core productivity. Going on a conquest just adds to the number of 1 shield cities and doesn't effect the core.
In communinsm however, the corruption is determined by the total number of cities divided by OCN (courthouses and PS help of course). So your core cities with 100spt might see 50% corruption down to 50spt, while your furthest small cities will go from 1spt out of 10 to 5spt out of 10. So you lose a ton of total shields doing this. Also, as you continue the conquest, your core production (overall corruption rate) keeps on going down. Your income goes in the tank, and soon it can't even sustain itself. The system goes to a grinding halt, and any thought of research goes to 40 turns. Why do you think that when the AI's all go into communism the tech rate slows to a crawl?
If you play a normal game, building up a strong core with a reasonable number of cities, and then go out on a conquest and capture a lot more, Communism is HIDEOUS. If you don't believe me try it - you might go from +500gpt income in democracy to +460 in Republic to +80 in Monarchy to -10gpt in Despotism to -150gpt in Communism, if there are many small cities. (I made and saw such a switch once and was appalled. I kept with it though, and when I switched back to Democracy when war was over it was like my civ was reborn)
The only way Communism can work is if you strictly limit the number of cities you build/capture, keeping it somewhere between OCN and 2*OCN. On a huge map, that's still a lot of cities, as one of the other posters noted. On a standard or small map, that's not much. You also do well to irrigate far cities heavily pre-communism to get them to a good size.
So as far as being in Rep/Democ and wanting to switch for wartime, Monarchy totally dominates Communism. (Actually, if you work it right, Republic is probably best, but that's covered in another thread in this forum

)
Charis