Starting from 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 0-0 6.e3 c5 7.Bd3 Nc6, players enter the Nimzo-Indian Defense: Sämisch Variation (ECO E29) — ECO E29. Across rating levels it shows up in 16,230 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: Sämisch Variation (ECO E28). On the White side, Aleksej Aleksandrov (10 games), Fernando Peralta (9 games), Efim Geller (7 games) top the database. Notable Black exponents: Gennady Tunik (5 games), Ratmir Kholmov (4 games), Andreas Schenk (3 games).
Move Diversity and Theory Depth
Move choice is far from uniform in the Nimzo-Indian Defense: Sämisch Variation (ECO E29). At 1200 Elo (102 games), the top reply is Nf3, played 57.6% of the time. Three other moves each take at least 5% of games, and the top three moves account for 80.8% of games. Entropy: 2.15. By 2500 (1,181 games), Ne2 takes over as the top reply at 74.2%; three other moves reach 5% and the top three moves account for 92.1% of games. Entropy drops to 1.30. The narrowing is significant — strong players consolidate around a small set of best moves, while amateurs scatter across many plausible-looking options.
Common Mistakes
- Drifting away from main theory — At 1200 Elo, the three most-played moves cover 80.8% of games, against 92.3% at 2000. The most popular deviation is Qc2 (played 6.1% of the time at 1200, 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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