Civilisation: Aztecs
Score: 1280 (normalised)
Winning date: 1868AD
Difficulty: Viceroy
Gamespeed: Normal
Version: SVN 659
Scenario: 3000BC
Strategy:
The metropolis era:
Found city on spot. Built the floating gardesn ASAP, irrigated all the food resources ASAP, no rushing, make all citizents to work on food tiles and wait. Tenochtitlan will become a very productive city, so use its production to build the counter-conquerors army (avoid wrokers and settlers). However, winning the 1st UHV is a little luck depedent. You need to aquire all the surrouding health and hapiness resources (spices, crab, clam, fish or even cow, gold, silver, dye), and NOT cut the forests. Moreover, you can get machinary relatively early (10-20 turns before deadline) and fill the mexican mountains with windmills. You may even try to get some great merchants and settle for the +1 extra food. You will be able to reach about 17 to 18 population in 1520, if you have enough to recover from plague.
Plague and extreme unluckiness is the main enemy here. In my game I got the plague just 10 turns before deadline, so my 16 level city (would be 17 in 1520 else) drawned to 13 level. However, I was lucky enough to win the 1st goal.
Surrounding cities:
Your initial army should conquer the Mayans, and use the second settler to settle a moderate productive city in the north. Make sure of two things:
*You will be able to aquire one extra health resource.
*You won't overlap with technotitlan (you all tiles of fat cross of technotitlan to be sure for the 1st UHV).
*It will be a productive city. This trivial since because all aztec land is really productive.
In this city you should train the extra workers you need and a couple of settlers for the 2nd UHV. I conquered the south and found a the cities in the north.
Make sure to build an army to be protected against conquerors. There is a danger that conquerors will spread a religion in your cities dooming the pagan temples or even destroying your cities. Apart from that it is the easiest part.
Conquerors and plague:
Many players would think that conquerors is the toughest part of an Aztec. Well, it is not! In one of my efforts, conquerors appeared extremely early (in 1350AD!!!), and I had trained no units. They conquered Yax Mutal and attacked Tenoctitlan. I managed to crash their army and reconquer Mayas.
What doomed this effort was the plague. If the plague spreads early then, everything would be OK (except if both plague and conquerors appear at 1350AD). Plague works in mestirious ways, it seems that it is prevented to spread early (so you can counter early conquerors), but it will appear in a late conqueror event, or in the second contact with a old world civ. So it is highly possible that plague will spread around 1450AD making the first goal difficult and luck depedent.
The claiming of Americas era:
After getting both goals, crashing conquerors and undergoing plague you just have to enslave 20 euros. The possibility to enslave a defeated euro is 1/3, so statistically you need to win 60 euros. Euros will be stronger than you, most of the times, so you need at least 2*60=120 units to win the UHV. Have in mind that euros will never bring or produce 60 units in Americas, so you will need for sure to ferry an army to Europe.
Moreover, euros will discover more advanced weaponary. However, you won't have access to iron until around 1810AD (unless you want to build a city that will flip to USA). Having all these in mind, you have no choice but to focus on military techs like guilds, gunpowder, astronomy and chemistry.
The best strategy is to win before 1772 AD (USA spawn date). It will allow you to control a vast empire in Americas maximising your score. If you lose this deadline, then newer powers will emerge in Americas, stealing european armies from Americas and some of your cities. The alternative of razing conquered colonies isn't an option. The cost is -10 stability points per razing, and your stability will be most of times shaky to collapsing most of the time, due to backyardness.
However, there is a good thing about playing after 1775. From 1450 to 1775 you were the only civ that really fought colonial powers (Inca will collapse or vassalise), but after that the new civs are your allies. And the best part: You are the stronger in this alliance!
Notes:
It is an enjoying game as being a civilisation trying to survive the test of time:
*Seeing those jaguars destroying longbows and muskets, and your muskets crashing rifles and infantry
*building the largest empire in new world
*reclaiming Americas before the "rise of nations' era" and...
*a lot of war blood. You are the leader of Indians that fight for their homeland, there is no difference in a conquest of New York from a Mahawk or an Aztec Musket.
The units problem:
Enslaving 20 exclusively european units seems wrong afterall. For examaple, why not enslaving Japanese units, if they settle Nihonmachi? Or why not enslaving Arab units if the conquer Incas? Why not enslaving Mughal unit if they get your conquerors? IMO it would better as follows:
"Enslave 20 non American units." Americans include natives, barbarians, indepedents (1&2), Incans/Peruvians, Mayans/Colombians, Americans, Argentinians and Brazilians.