lnn2 wrote on 02/21/06 at 14:21:57:
Hello,
perhaps because of Sakaev/Semkov book, and long semi-slav experience, feel Black is in theoretically better shape after 3. Nf3 Nf6 4.Nc3 a6 (looks safer than Botvinnik/Moscow?!), than going into Main Slav. Found Semkov's comment interesting, as i don't remember him expressing too highly of 3. Nf3 Nf6 4. Nc3 in his book.
Recently I've been playing the QGA on a experimental basis, as part of an attempt to broaden my chess horizons. Also I play 1. d4 exclusively, and for a long time my usual weapon against the QGA was 4. Nc3.
I think it really is very uncertain whether Black is O.K. after 4...a6. White's gambit is extremely dangerous. From reading Sakaev and Semkov, I don't think that their chirrupy confidence in Black's chances in this line is backed up by anything concrete in their presentation. Several of the lines lead to positions where the soundness of Black's game is open to question.
Definitely the analysis of 4. Nc3 a6 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 Qd5 9. g3 Bb7 10. Bg2 Qd7 11. e6!? both in Rizitano and S&S is inadequate. See Ptero's post here
http://www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1144033557
and my own post that currently ends that thread.
I would happily play 4. Nc3 if I could be sure of getting 4...a6 in reply, but I no longer play it, because I would prefer to avoid the Dutch Slav (I don't think the Tolush-Geller Gamibit is completely sound). 4...c6 may not be as ambitious as 4...a6, but it hardly surrenders any winning chances if Black is the better player. From a Black point of view, I would think that a QGA repertoire with transposition to the Dutch Slav in case of 4. Nc3 would make a great deal of sense.
Rizitano's book, by the way, is a must-have for QGA practioners.