As title above, What's the best answer to 1.d4 Nf6 2.c4 e6 3.a3? Assuming that I, as Black, am a Nimzo-Indian Player, there is no hope for a Nimzo now. Would you go for 3...d5 (QGD with no particularly useful a3 move by White), or for a Benoni-like structure with 3...c5? (allowing 4.d5), or for a Queen's Indian structure with 3...b6? Or something else?

  • What line do you play in the Nimzo? My advice is typically to keep as consistent a pawn structure as possible across various openings (without playing “too slow” simply for the sake of getting that structure). Pawn structure is (usually) the backbone of your attack and similar tactical motifs will often present themselves.
    – Dennis
    Jan 24 '18 at 19:28

This really comes down to what you're comfortable with. Both the Benoni and the QGD are good options, precisely because of the reason you mention: a3 isn't really useful for White in those openings, so you'll be playing lines with a tempo up. According to chessgames.com, Black is already better. Which line (3... d5 or 3... c5) is better is just a matter of personal preference.

3... b6 is of course playable, and Black scores 50%, but it allows White to transpose to one of the main lines of the Queen's Indian with 4. Nf3.

  • Completely agree.
    – rougon
    Jan 23 '18 at 2:39
  • I would argue that a2-a3 is often useful in the QGD and seldom played in the Benoni, so 3...c5 might be the most subtle choice. But in practice, it is really a matter of choice for the second player.
    – Evargalo
    Jan 23 '18 at 9:17

According to chessTempo.com's database for over 2200 rated player games 3...c5 scores best for Black with 43% wins for Black and only 20% wins for White. By-the-way, there is another alternative you didn't mention which is 3...d6

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