Ya, I tried a map "sandstorm" with 4 players, hoping for an easy ride, but it gave me hills, jungle, forest. Basically, what is the point of 5 movement when it is reduced to 1 on rough terrain anyway? I did win by t89. Chariot Archers are really bad early on, however. They can die to a city attack and an archer. You need 3-4 promotions for them to actually be good. They are still fragile. And when you go for fast conquest, your spearman just doesn't quite cut it, and you will need a horseman, but horsemen are also fragile when sieging cities. So you will be losing either horsemen or chariot archers every turn or every other turn going again civs who went Tradition, Goddess of Protection pantheon, or built walls. But I think it should be doable sub t-100 with the right terrain and with splitting into 2 armies, at least 4 chariots each. It's not going to work vs capitals deep in the forest.