Chess Opening Theory/1. d4/1...Nf6/2. Nc3/2...d5/3. Bg5

=Richter-Veresov Attack=

3...Bg5?!
The Richter-Veresov Attack is not the common attack we see, white plays early Bg5 while aiming at the knight on f6, preparing to damage black’s pawn structure, black’s most common response is e6 but other moves are seen as well, the attack can lead to a sharp attack and black has to play carefully.

Theory table

 * 1.d4 Nf6 2.Nc3 d5 3.Bg5