The Grünfeld Defence: 1.d4 Nf6 2.c4... 6.Qb3 begins with 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 0-0 6.Qb3 (ECO D95). Across rating levels it shows up in 60,201 recorded games — enough data to map exactly where it succeeds and where it stalls.
History and Notable Players
It arises from the Grünfeld Defence: 1.d4 Nf6 2.c4... 5.e3. On the White side, Azer Mirzoev (9 games), Dragoljub Jacimovic (9 games), Arthur Bernard Bisguier (7 games) top the database. Notable Black exponents: Anthony Edward Santasiere (5 games), Jaroslav Sajtar (4 games), Rudolf Spielmann (4 games).
Performance Across Rating Levels
Popularity and results vary sharply by rating level. Among 1200-rated players, it appears in 0.00% of games — 1,352 of them on record — with White winning 50.5% and Black 46.7%. At 1800 the opening surfaces in 0.00% of games; White wins 50.4%, Black 44.7%, draws 4.8%. Among 2500-rated players the line appears in 0.01% of games and draws spike to 12.5%, indicating tight preparation. White's edge erodes by 3.4pp from 1200 to 2500 Elo, suggesting Black's counterplay is easier to find with experience.
Move Diversity and Theory Depth
What players actually play after the opening moves depends heavily on rating. At 1200 Elo, the top reply is c6, played 28.6% of the time. There are 7 other moves seeing meaningful share, and 64.8% of games stick to established theory. Entropy: 2.92. By 2500, dxc4 dominates at 39.5% of replies; only 4 viable alternatives remain and 92.5% of moves are theory. Entropy drops to 1.85. 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 400 Elo, theory adherence sits at 61.5% — versus 89.9% at 2000. The most popular deviation is Be6 (played 19.2% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- Neglecting development — Extra pawn moves in the opening are tempting, especially when you "know the moves". Developing a piece each turn is the simple correction.
- Playing without a plan — Each Grünfeld Defence: 1.d4 Nf6 2.c4... 6.Qb3 middlegame demands a specific approach. Decide whether the position calls for attack, manoeuvre, or simplification before reaching for a move.
Practice on Chessiverse
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