Queen's Gambit Declined
1.d4 d5 2.c4 e6 · you play black
2 chapters, 8 moves deep, get you to 95% of what you will actually meet. The other 1 covers the last 2%.
Course progress
0 of 307 decisions
0 still learning · 307 not asked yet
1 more chapter is below the depth for your level, together 2% of what you meet.
Drill this opening
Any chapter or study, asked cold — whether or not you owe it. Nothing here is unlocked by anything else.
At your level
Level
Improving
Depth
16 plies of this opening
Chapters
2
Decisions
307 of 377
0/307
How this goes wrong at your level
Counted from 4,500,000 games by players in your band. These are moves that get played often and then lose — no engine was asked for an opinion.
What you are most likely to fall for
1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c6 5.Nf3
h6 — played 6% of the time here.
You score 36% after it, against 48% for everything else played from this position, over 270 games.
Instead:
Bd6
54%
Nbd7
53%
dxc4
52%
What your opponents fall for
1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.cxd5 exd5
Nxd5 — played 27% of the time here.
They score 25% after it, against 56% for everything else played from this position, over 73 games.
They should play:
Nf3
64%
e3
53%
Found by testing 94,688 decisions in your band’s games and keeping only those where the drop in score is more than four standard errors below the alternatives. About 3.17 of these would be expected by chance alone.
Your moves are chosen by the engine and checked against 3,439,091 games (Lichess Elite (2500+ vs 2300+), 2024-12 → 2025-11); their replies are what people actually play. Evaluations from Lichess Stockfish evaluations (database.lichess.org) (CC0 1.0 Universal), covering 87% of this course.