Qc7 9.O-O-O Nbd7, and now 10.g4 or 10.Bd3 after each of these moves there is a huge body of opening theory.
Qc7 9.O-O-O Nbd7, this is called the old main line. At this point White usually responds with 10.g4 or 10.Bd3 after each of these moves there is a huge body of opening theory.