Won a 193 turn victory, Mongolia, pangea, standard speed, immortal difficulty.
Settled my capital on a riverside gold hill, had two more gold and one ivory near. Double scout start, followed by a monument.
Turn 10, I found El Dorado curiously hidden behind a chain of mountains. Just a turn before, I thought what a mistake it was to send the poor guy through a terrain so rough. Haven't had much luck with ancient ruins, though.
Used the El Dorado gold to buy a settler, settled three tiles away from my cap, on a fine riverside hill with gold and gems nearby. Unfortunately, that proved to be suboptimal city positioning, since horses were three tiles away. Used the gold luxury gold to buy a worker, mine the luxuries and sell them for cash.
Got dowed by Babylon by turn 30. A few turns later got dowed by Alex. Had to by a couple of horses from India, to produce some chariot archers. Fortunately, rough terrain, and some clever city attacks kept me alive long enough to ally a friendly cultural with 4 horses, produce some chariot archers and repel the first attacks.
I also had to use a liberty settler to settle a completely unoptimal city spot, on top of four horses without anything nearby, since I needed horses as soon as posible to produce enough chariot archers. Finally, somewhere between turn 75 and 80, I bulbed chivlary, steamrolled Babylon, used the pillaging gold for upgrades, and turned to Greece.
By turn 110, I plowed through Babylon, Greece, and India, using seven Keshiks and one horseman. By turn 180, I have finished off the Aztecs, and France, using only five of the seven Keshiks and two horseman. It took me almost twenty turns to get to Moscow, because Cathy had built the Great Wall. Anyway, I suppose I could have won at least twenty or thirty turns earlier if I had been focused on producing new Keshiks constantly (after the initial seven chariot archers and one horsemen, i have produced only one additional horse), attacking with two separate armies, and going straight for capitals, instead of plowing through the whole territory. Also, that was the first time I actually played Mongolia, so I wasted some turns due to poor positioning. And also, I forgot to mention the eight civ, Denmark. Well, as usual they got trashed by somebody else, before I even got to them.
Not bad for my first game with Mongolia. Insanely powerful unique units. And a great strategy, thank you OP.