1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.a3 Bxc3+ 7.bxc3 opens the Nimzo-Indian Defence: 1.d4 Nf6 2.c4... 7.bxc3, ECO E49. With 48,522 games on record, the patterns below come from the largest practical sample available.
History and Notable Players
It arises from the Nimzo-Indian Defence: 1.d4 Nf6 2.c4... d5. Among the most prolific White practitioners are Vadim Milov (27 games), Jonathan Levitt (18 games), Boris Gulko (13 games). Black-side regulars include Wolfgang Unzicker (5 games), Aloyzas Kveinys (4 games), Murray G Chandler (4 games).
Performance Across Rating Levels
Popularity and results vary sharply by rating level. At 1200 Elo, the opening shows up in 0.00% of games (2,220 samples). White scores 47%, Black 49.3%, draws 3.7%. By 1800, popularity is 0.00% and White's score is 52.1% to Black's 43.5%. At 2500, 0.03% of games go into this opening; draws sit at 8.4% — the line is well-mapped at this level. White's score improves by 4.5pp from the 1200 bracket to the 2500 bracket — the line rewards preparation.
Move Diversity and Theory Depth
What players actually play after the opening moves depends heavily on rating. At 1200 Elo, the top reply is Nc6, played 24.4% of the time. There are 6 other moves seeing meaningful share, and 51.1% of games stick to established theory. Entropy: 3.21. By 2500, dxc4 dominates at 65.7% of replies; only 3 viable alternatives remain and 96% of moves are theory. Entropy drops to 1.41. 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 59.9% — versus 78.8% at 2000. The most popular deviation is Ne4 (played 8.7% 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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