I didn't play perfect in the first 40 minutes. Also, I had big trouble with destroying a Hard computer.
China has a big problem against countering cavalry and artillery.
Well, if you have'nt already, watch my 40 min treaty with china vs 4 expert comps. China eco is that great that you get profit even if 4 expert comps spam you (if you use the 119 vill + livestock tactic).