Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nc3/3...dxc4/4.e3/4...b5/5.Nxb5/5...cxb5/6.Qf3/6...Nc6/7.Qxc6+/7...Bd7/8.Qf3
This is the safest and best queen move. White decides that he will be defending and has made a mistake with 5.Nxb5. Therefore, he regroups his army and prepares for black to dish out hard shots. Black plays another excellent move that frees his position completely and rips open the center.