Starting from 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6, players enter the Nimzo-Indian Defense: Normal Variation, Schlechter Defense — ECO E43. Lichess records 294,460 games in this line, which gives us a reliable view of how it actually performs in practice.
History and Notable Players
It arises from the Nimzo-Indian Defense: Rubinstein System. On the White side, Svetozar Gligoric (55 games), Aleksej Aleksandrov (26 games), Vladimir Georgiev (26 games) top the database. Notable Black exponents: Nick E De Firmian (41 games), Oleg M Romanishin (31 games), Chris G Ward (27 games).
Performance Across Rating Levels
The picture changes a lot as you climb the rating ladder. Among 1200-rated players, it appears in 0.00% of games — 5,446 of them on record — with White winning 48% and Black 48.2%. By 1800, popularity is 0.01% and White's score is 47% to Black's 48.1%. At the top end (2500+ Elo), popularity is 0.08% with 9% draws — a clear sign of how much theory rules the line at master level. Positions also become less sharp as level rises (sharpness 0.96 → 0.91).
Move Diversity and Theory Depth
Looking at move selection shows how forcing — or not — the position really is. At 1200 Elo, the top reply is Bd2, played 34.1% of the time. There are 5 other moves seeing meaningful share, and 73.6% of games stick to established theory. Entropy: 2.56. By 2500, Ne2 dominates at 55.3% of replies; only 4 viable alternatives remain and 90.9% of moves are theory. Entropy drops to 1.75. The narrowing is significant — strong players consolidate around a small set of best moves, while amateurs scatter across many plausible-looking options.
Historical Trends
Long-term, the trajectory of this opening is informative. Adoption peaked in 2015 at 0.011% (2,492 games). By 2025 it sits at 0.006%, 49% below the peak but still 14% above its 2013 level, so the line is up over the full period despite easing from the high.
Main Lines and Variations
From the position after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6, the recognised continuations are:
Each branch leads to a different middlegame character — the resulting pawn structure decides what kind of game you get.
Common Mistakes
- Drifting away from main theory — At 400 Elo, theory adherence sits at 78.4% — versus 84.7% at 2000. The most popular deviation is a3 (played 23.4% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- Neglecting development — Extra pawn moves in the opening are tempting, especially when you "know the moves". Developing a piece each turn is the simple correction.
- 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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