Starting from 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6, players enter the Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense — ECO E23. Across rating levels it shows up in 16,459 recorded games — enough data to map exactly where it succeeds and where it stalls.
History and Notable Players
It arises from the Nimzo-Indian Defense: Spielmann Variation. Among the most prolific White practitioners are Guillermo Soppe (8 games), Wolfgang Riedel (7 games), Gideon Stahlberg (7 games). Black-side regulars include Vasja Pirc (4 games), Aaron Nimzowitsch (4 games), Isaac Kashdan (3 games).
Move Diversity and Theory Depth
What players actually play after the opening moves depends heavily on rating. At 1200 Elo, the top reply is a3, played 30.5% of the time. There are 6 other moves seeing meaningful share, and 66.1% of games stick to established theory. Entropy: 2.70. By 2500, Nf3 dominates at 86.8% of replies; only 2 viable alternatives remain and 97.9% of moves are theory. Entropy drops to 0.77. That entropy collapse is the signature of a line where preparation pays off: at the top, players know the best move and play it.
Common Mistakes
- Drifting away from main theory — At 400 Elo, theory adherence sits at 77.8% — versus 84.3% at 2000. The most popular deviation is Bd2 (played 22.2% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- Neglecting development — It can feel productive to make extra pawn moves early, but falling behind in piece development is what loses most amateur games — especially in open positions where active pieces find squares fast.
- Letting White own the centre — Hypermodern openings concede central space on purpose, but only if you strike back in time. Delay the counter-blow and you end up squeezed.
Practice on Chessiverse
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