Smyslov_Fan, in what line in the Tarrasch, where white played f4 do you have the opportunity to put your bishop on d6? Are you referring maybe to the setup with Bd3 instead of f4?

Thanks, Dom.
I think Black can improve on Adams-Carton, which is from 1989 btw. Simon Williams was willing to play this some years later against Dearing, who deviated first.
What keeps me busy most, is when to exchange on d4 (cxd4) and when on e5 (fxe5). At the moment I think Black can play these pawn exchanges immediately, to deny White extra possibilities - Nxd4 after cxd4 and dxe5 after fxe5. Opinions?
I have never understand the logic behind 9.g3 Bb4+ chasing the White king to a corner he wants to reach anyway.
As I am very attracted to the sacrificial possibilties on e5 closing the centre with f5 is not for me.

Now, the "long" post about g5...

To Gueler: yes, after the first moves given by Mnb, 7...Qb6 8.g3 cxd4 9.cxd4 Bb4+ 10.Kf2 then 10...g5!? (Aleksei Kosikov.. see one chapter of Dvorestky&Yussupov "Opening Preparation" book)
If Black delays Bb4+ (as in the line given by Mnb) then White has one tempo to move bishop from f1 (Bh3/Bd3) and continue the plan started with 8.g3: move the king to the square g2 (McDonald&Harley). Example: 9...f6!? 10.Bh3 (10.Bd3!?) fxe5 11.fxe5 Bb4+ (11.Be7 see game: Adams-Carton,Swansea 1995 (Psakhis Nd2)) 12.Kf1 oo 13.Kg2! Ndxe5!? 14.dxe5 Nxe5 and now look at old Chesspublishing French update august 2004 game Mack-Beach ).

yes, the move 8...f5!? is only given in Mokry's book about the French,but it's difficult for me to understand Black's strategy, since Black has not counterplay on the kingside with a somewhat closed center.

One important alternative occurs when White plays a3 (e.g. to forbid Bb4+) or when Blacks plays a5. One good idea to Black is to keep all options in the center with a5:  8.g3 a5!? 9.a3 (9.a4!? cxd4 and roughly the same variation with g5 or f6) a4 10.Ne2 and now Black can try Ndb8 but it's far from clear...McShane-Poldauf,Allemagne 1998 (Psakhis Nd2)...and Black can wisely try 9...f5 instead of 9..a4. Kindermann-Polgar,Baden Baden 1985 (MCO et BCO). 
The line with a3!? is important because White has the choice to play an ealier a3 , with 8.a3 thus Black sometimes plays 7..cxd4 and now g3 move is not useful for White : 8.cxd4 Bb4+ 9.Kf2 Qb6 10.Be3 and the bishop on b4 doesn't allow Qxb2...

Dom,

I assume you are referring to the system with 

1 e4 e6
2 d4 d5
3 Nd2 Nf6
4 e5 Nfd7
5 f4 c5
6 c3 Nc6
7 Ndf3 Qb6

Any takers for 7 ... cd4 8 cd4 f5 ? 

Not too long ago Brugui started the interesting thread “trouble with Mr. Tarrasch.”  Based on the feedback, it seems to me that the two most popular responses to Nd2 are Nf6 and dxe4. 

In the Nf6 line - with a white Bd3 - the setup with Bd6 and Qc7 as well as Bd6 with an immediate 0-0 by Black was discussed, not however Bd6 and Qb6.

I am interested what you guys are playing against the Tarrasch with Nf6 and the white system with f4.