Chess Opening Theory/1. d4/1...Nf6/2. Nc3/2...d5

2...d5
2...d5 commonly transposes to the Richter-Veresov Attack after 3. Bg5 or the Jobava London after 3. Bf4.

Theory table

 * 1.d4 Nf6 2.Nc3 d5

/3._Bh6