1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 opens the Queen's Gambit Declined (4...Nbd7 5.e3), ECO D52. Across rating levels it shows up in 1,556,990 recorded games — enough data to map exactly where it succeeds and where it stalls.
History and Notable Players
It arises from the Queen's Gambit Declined: Modern Variation, Knight Defense. Among the most prolific White practitioners are Pia Cramling (21 games), Ernst Gruenfeld (16 games), Alexander Moiseenko (15 games). Black-side regulars include Sergey Smagin (27 games), Aleksey Dreev (27 games), Dragisa Blagojevic (19 games).
Performance Across Rating Levels
How well the Queen's Gambit Declined (4...Nbd7 5.e3) works depends on what level you're playing at. At 1200 Elo, the opening shows up in 0.00% of games (25,044 samples). White scores 51%, Black 45.4%, draws 3.6%. Move up to 1800 Elo and the share shifts to 0.06%, with White winning 47.9% versus Black's 46.8%. Among 2500-rated players the line appears in 0.11% of games and draws spike to 10.7%, indicating tight preparation. Positions also become less sharp as level rises (sharpness 0.96 → 0.89).
Time Control Patterns
Time control matters here: blitz players reach for this opening more than others. In bullet, it appears in 0.02% of games (642,370); White wins 50.3%. Blitz shows 0.04% adoption across 1,343,558 games, White scoring 48.9%. In rapid, the share rises to 0.02% — 210,518 games, White 47.5%. White's score swings 2.8pp 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 (24,985 games), the top reply is Be7, played 29.4% of the time. Four other moves each take at least 5% of games, and the top three moves account for 65.7% of games. Entropy: 2.85. By 2500 (15,551 games), Qa5 takes over as the top reply at 60.2%; only two other moves still reach 5% and the top three moves account for 91% of games. Entropy drops to 1.71. 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 2013 at 0.05% (1,447 games). By 2025 it sits at 0.03%, down 43% from that high, leaving the line in decline.
Common Mistakes
- Drifting away from main theory — At 400 Elo, the three most-played moves cover 64.8% of games, against 83.6% at 2000. The most popular deviation is Bb4 (played 21.9% of the time at 400, 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.
- Overextending the attack — Gambits look like permission to throw everything forward. They aren't — every attacking move should improve a piece. Random checks and threats burn the initiative once they fail to coordinate.
Practice on Chessiverse
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