When I play Amra's Advanced Mod with cultural victory on, the first player to plant three cities wins a cultural victory. I have had this happen several times, with both version 3.0 and 3.1. If the AI plants three cities, they win the cultural victory. If I beat them to it I do. By that time I have culture in my first city, but not the second two.
Do you need more information?
Do you need more information?