Marshall Gambit QGD D31


6.Nc3 isn't a very good move, especially if you want to attack, the immediate 6..c5 is even stronger than Nf6 imo.
If you want to attack in this line I suggest you choose a pet line in the main variation of: 6.Bd2 Qxd4 7.Bxb4 Qxe4+ 8.Be2, when white gives up a pawn but has the bishop pair, centre control, and pressure on the dark squares as compensation.


6.Nc3 isn't a very good move, especially if you want to attack, the immediate 6..c5 is even stronger than Nf6 imo.
If you want to attack in this line I suggest you choose a pet line in the main variation of: 6.Bd2 Qxd4 7.Bxb4 Qxe4+ 8.Be2, when white gives up a pawn but has the bishop pair, centre control, and pressure on the dark squares as compensation.
6.Nc3 is just fine if you want to play "out of book", and IMO 6...Nf6 is the most exact move sequence - 6...c5 allows 7.a3 Ba5 8.Be3! followed by Ne2, when Black has not solved all his opening problems yet.
This development pattern does not work against 6...Nf6, e.g. 7.a3 Ba5 8.Be3 0-0, when 9.Nge2?! is not good due to 9...Ng4, and after 9.Nf3 c5, Black is on the right track again, e.g. 10.Qd3 (engine recommendation) cxd4 11.Nxd4 e5 12.Ndb5 a6 13.Nd6 Bxc3+ 14.Bxc3 Be6, and every single game played like that was drawn.
That leaves 9.b4, but after 9...Bc7 10.Nf3 Ng4 followed by ...e5 Black seems doing fine to me.

6.Nc3 isn't a very good move, especially if you want to attack, the immediate 6..c5 is even stronger than Nf6 imo.
6.Nc3 is just fine if you want to play "out of book", and IMO 6...Nf6 is the most exact move sequence - 6...c5 allows 7.a3 Ba5 8.Be3! followed by Ne2, when Black has not solved all his opening problems yet.
I certaintly wasn't claiming there was anything wrong with 6..Nf6, but I still think that after both 6..c5 7.a3 Bxc3, and 7..Ba5 8.Be3 black is doing very well.
I also believe there are easier, and stonger ways to play out of book for white than this 6.Nc3 line.

Unless theory has changed quite recently I believe that 8.Be2 is still considered stornger the 8.Ne2, though Ne2 is quite acceptable and also quite venomous.
As for your game, Scherbakov gives: 10..Na6 11.Rg1, which I think is stronger than your Bc3, as it maintains more pressure, he continues 11..Qf6 12.Bc3 e5 13.Ng3, with Ne4-d6, Qd2, 0-0-0 ideas coming.