Starting from 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Nf3 d5 6.Bd3 c5 7.0-0 Nc6, players enter the Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense — ECO E56. Lichess records 50,341 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: Normal Variation, Gligoric System. Among the most prolific White practitioners are Svetozar Gligoric (52 games), Jan Hein Donner (29 games), Rainer Knaak (27 games). Black-side regulars include Yuri L Averbakh (19 games), Boris V Spassky (17 games), Aleksandar Matanovic (17 games).
Move Diversity and Theory Depth
Move choice is far from uniform in the Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense. At 1200 Elo (426 games), the top reply is a3, played 36.4% of the time. Five other moves each take at least 5% of games, and the top three moves account for 69.2% of games. Entropy: 2.75. By 2500 (1,350 games), a3 dominates at 61.2% of replies; only one other move still reaches 5% and the top three moves account for 97.1% of games. Entropy drops to 1.37. The narrowing is significant — strong players consolidate around a small set of best moves, while amateurs scatter across many plausible-looking options.
Main Lines and Variations
The main branches off 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Nf3 d5 6.Bd3 c5 7.0-0 Nc6 include:
- Nimzo-Indian Defense: Normal Variation, Bernstein Defense, Exchange Line
- Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense (8...dxc4 9.Bxc4 cxd4)
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 1200 Elo, the three most-played moves cover 69.2% of games, against 85.3% at 2000. The most popular deviation is cxd5 (played 23% of the time at 1200, 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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