on 05/26/23 at 00:35:01:
The great QGA proponent Rublevsky seems to favor 1.d4 d5 2.Nf3 Nf6 and 1.c4 e5.
True, but Rublevsky usually answers 1.d4 d5 2.Nf3 Nf6 3.c4 with 3...c6, which is a different kettle of fish. Also 1.c4 e5 is fine for black, but I think 1.c4 c5 is more likely to appeal to the typical QGA player.
Black's choice after 1.d4 d5 2.Nf3
should be informed by what they do after 1.d4 d5 2.c4 dxc4 3.Nf3. There are actually a bunch of moves for black here: 3...Nf6, 3...c6, 3...e6, and 3...a6 are all important, and 3...c5 is possible. QGA players who want a main line used to answer 1.d4 d5 2.c4 dxc4 3.Nf3 with a careful 3...e6, which negates 2...Nf6
on account of 3.c4 dxc4 and black is move ordered. Black is equally move ordered if they would have chosen any of the "other" third moves besides 3...Nf6. Recently more popular after 1.d4 d5 2.c4 dxc4 3.Nf3 is a careful 3...Nf6 4.e3 e6 5.Bxc4 a6, and if this is black's intention there is nothing wrong with 2...Nf6
. Also if black wants 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4!? then only 2...Nf6
will do. Sometimes I play 2...e6
which I think is a reliable move. 3.c4 dxc4 is a QGA, 3.Bf4 Bd6 and 3.Bg5 Be7 are not the typical London/Torre white is expecting, and other moves black can play classically. Perhaps 3.e3 is a bit dry from black's point of view, therefore ... More often I play the ambitious 2...c5!?
when white can pose problems only with 3.c4!. But weaker players never do this, usually it's 3.e3 cxd4!? 4.exd4 Nc6 with a type of Caro-Kann, else it's 3.c3 cxd4!? 4.cxd4 Nc6 with an Exchange Slav -- my favorite opening for black, but I'm strange that way.
I have been known to "force" a QGA with 1...e6
2.d4 d5 3.Nc3 dxc4?! which Steinitz used occasionally but not many players since then -- for good reason. Not really recommendable but so far I have had good luck with it. 1...Nf6
is right out because of 2.d4 and black is move ordered, although I also play the Slav (and certain Caro-Kanns as mentioned) so I have further options of 1...c6
2.d4 c6. White's threat of 2.d4(!) after 1.c4 really limits black's choices if they don't want to be move ordered out of a QGA, so it comes down to "preventing" the threat with 1...e5
, or having a second defense ready against the Queen's Gambit.