1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bg5 opens the Grünfeld Defence: 1.d4 Nf6 2.c4... 5.Bg5, ECO D91. Lichess records 844,760 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 Grünfeld Defence: 1.d4 Nf6 2.c4... 4.Nf3. On the White side, Alexander Raetsky (38 games), Efstratios Grivas (26 games), Eduard Meduna (25 games) top the database. Notable Black exponents: Josef Pribyl (19 games), Victor Mikhalevski (19 games), Vlastimil Jansa (19 games).
Performance Across Rating Levels
The picture changes a lot as you climb the rating ladder. At 1200 Elo, the opening shows up in 0.00% of games (30,017 samples). White scores 50.8%, Black 45.6%, draws 3.6%. By 1800, popularity is 0.03% and White's score is 47.4% to Black's 47.5%. At 2500, 0.11% of games go into this opening; draws sit at 11.5% — the line is well-mapped at this level. White's edge erodes by 4.5pp from 1200 to 2500 Elo, suggesting Black's counterplay is easier to find with experience.
Time Control Patterns
Look at the same opening across time controls and bullet stands out. In bullet, it appears in 0.02% of games (550,273); White wins 49.5%. Blitz shows 0.02% adoption across 741,176 games, White scoring 48.6%. In rapid, the share rises to 0.01% — 102,031 games, White 47.3%. White's score swings 2.2pp across formats, so time control isn't just a stylistic choice here — it shifts the actual results.
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 O-O, played 38.9% of the time. There are 5 other moves seeing meaningful share, and 69.4% of games stick to established theory. Entropy: 2.77. By 2500, Ne4 dominates at 77.7% of replies; only 3 viable alternatives remain and 95.2% of moves are theory. Entropy drops to 1.16. 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 2018 at 0.02% (40,646 games). By 2025 it sits at 0.01% — a 38% shift overall, leaving the line on the rise.
Common Mistakes
- Drifting away from main theory — At 400 Elo, theory adherence sits at 67.3% — versus 83.5% at 2000. The most popular deviation is dxc4 (played 17.7% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- Neglecting development — 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... 5.Bg5 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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