A hard proposition, to be sure, but it is doable, I think. Have to go with the Byzantines, because they're easily the best OCC civ. After a few maps, got one that looks promising because of the good production. Wasn't sure if the food would be enough, but from my initial calculations it looked like it would be. Lots of hills and mountains means a decent shot at getting some iron and/or saltpeter. But that's to worry about later; for now, just getting underway is the only worry. Exploring showed first some very bad news - I was neighbors with the Vikings, meaning I had to watch my defense. Fortunately, I had founded my city on a hill, so the likelihood of rebuffing an early attack was pretty high. The first order of business was the Colossus, which is not particularly easy to get on Deity - usually you have time to build maybe 3 units before starting it. I built a warrior, curragh, and another worker, and then began construction. My lone Curragh got somewhat lucky in its exploration, making contacts with the Persians, Spanish, and Zulu fairly early. This would be helpful for getting tech from the Great Library later on. Good news came as we won the race to the Colossus! Immediately, 2 more curraghs were built, then a granary and barracks, then spears for defense from the Vikings. Meanwhile, we pursued Writing at 10%. The goal was to get Writing at 10%, then go max research (with lux slider for happiness) on CoL and then Philosophy, but after getting Writing, the AI's had enough tech that we feared not getting Philosophy first, so instead we decided it would be wise to pursue Philosophy directly after Writing, and use it to get Literature to build the Great Libary. Amazingly enough, we got Philosophy first, and nabbed Literature. Even more amazingly, BOTH advances netted us a Scientific Great Leader!