Thanks for the input, everyone! Very good advice.
I especially appreciate the guidance regarding the civics--once again, my usual preferences are coming to the fore, and I need to keep reminding myself that I'm playing a very different strat here. It was almost a reflex to switch to Free Speech at this point, as you'd want to do so ASAP in a cottage economy, which is what I'm used to. Yes, yes...I'm not RUNNING a cottage economy. D'OH!! Old habits die hard, what can I say.
I'll probably switch to Vassalage as soon as I can so I can keep producing Level 3 units without Theocracy. I'll stick with it at least until I build the Pentagon, then I might switch to Nationhood if WW is a problem, or back to Bureaucracy if it's not. The switch to Free Speech was definitely worthwhile for diplomacy, happiness, and research, so I'm going to stick with it. I had another look at Karakorum, and it will still be a very good production city without State Property, so I will heed everyone's advice and stick with Mercantilism. On a related note, the Forbidden Palace will probably go in New Serai--a good central location for the northern half of the continent. (Hatty beat me to Versailles.)
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UncleJJ, I'll be VERY interested to hear the results of your comparison game. You said to go one way (markets, grocers, banks), but most of the other posters said to go another to remain in keeping with the principles of a specialist economy. Normally I do indeed build commerce multipliers in science cities, since they usually have cottages and therefore benefit from both types of buildings. And in fact, I did start several of those buildings, then abandoned them. In a SE--
theoretically--only the wealth cities will benefit from these buildings. The science cities should be building units in the absence of any science buildings. Again, in theory.
This ALC is one of the most experimental I've done and as such has been an extremely worthwhile experience, though not without a few bumps on the road. Posting the results of your game would allow us to further fine-tune the SE strategy for all our future games that use it. Your comparison game should illustrate, I hope, whether the theory is all it's cracked up to be. And that's a big part of the reason why I continue to post these games.
Whatever level of expertise I may have gained, I still consider myself to be a "typical" Civ player. As I've said many times, I don't play with a calculator handy and I don't want to, though I am certainly willing to take advice from those who do. (Thanks!

) Perhaps this means that my execution of certain strategies are not optimal. In the ALCs I think that's fine for two reasons. First, as I've also said before, everyone can learn from my mistakes. Second, I think it illustrates whether a certain strategy is viable for another "typical" player, who, like me, relies on the seat of his pants more often than a calculator, and will therefore also make a few sub-optimal decisions.
Yavathol's experience is a case in point. The MC/Pyramids gambit requires a very precise, detailed approach, and many of its required steps (like the heavy capital/2nd city overlap) are counter-intuitive. You CANNOT make sub-optimal decisions with that gambit, and Yavathol's game proves that (how's that for a back-handed compliment?

). The overall specialist economy is a little more forgiving, as the relative success of Frankfurt has shown. But a comparison game would be very informative.
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Yes, I want to go after Monty VERY soon. I'll probably take 2-4 turns to get everything into position (including moving my Workers out of harm's way) and then hit him hard. I looked at the tech chart again, and he's not far from getting some key military techs (Gunpowder, Chemistry, Military Tradition). He'll probably bee-line to them as soon as I declare war. Besides attacking his cities, I think I'll also send some units far behind enemy lines to pillage some of his resources: horses and ivory in particular, then cottages and happy to slow down his research. (Another benefit of the SE: may as well pillage cottages around cities you're going to capture since you'll probably replace them with farms.)
I also want to move some of my Frigates into position outside his coastal cities, most of which are on the west coast. The Frigates could remove the cultural defenses in advance of my stack arriving. This would allow me to have at least two stacks: one with the 4 Accuracy Cats for the inland cities, another without them since the Frigates will take care of the coastal cities' defenses. I also need to move my Galleons over there, in anticipation of shipping units to the other continent.
I think the battle plan will be to use a stack with the 4 Accuracy cats to quickly take that coastal city SW of New Serai, whatever it's called. (I
still hate the Aztec city names. Watch for them to change as they fall.) Taking that city should alleviate enough of the cultural pressure on New Serai so it can feed itself. Meanwhile, the rest of my forces will remain in New/Old Serai and soak up Monty's initial counter-attack. Once that's been absorbed, the 4 Cats head NW, into Monty's interior, with one stack, while the other works its way west then north along the coast, following the Frigates.
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Diplomacy or Domination? Well, let me put it this way. I
could bee-line to Mass Media. Or...a little further north on the tech chart...definitely attainable within the next round...can you see it? Can you? Look hard...
Industrialism.
PANZERS.
Deutchland uber alles...