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D30bPlay as Black9 lines to train

Learn the Queen's Gambit Declined

Hold the center with ...e6 and ...d5 — solid, reliable, and strategic.

Practice this openingUnderstand the moves
Main line

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7

1.d41…d52.c42…e63.Nc33…Nf64.Bg54…Be75.e35…O-O6.Nf36…Nbd7

The idea

Why this opening works

The Queen's Gambit Declined is one of the most solid and reputable defenses in chess. By holding the pawn on d5 with ...e6, Black gets a stable central structure and reliable development. The position is strategically rich — you learn to play with a slightly cramped but rock-solid position, find counterplay at the right moment, and gradually equalize. Masters from Capablanca to Carlsen have relied on it.

What to remember

  • Know the first 8 half-moves of the main line.
  • Understand the purpose of your key moves before adding more theory.
  • Practice the branches until you can respond without move-order guessing.

Move by move

The moves worth understanding

Theory sticks when every move has a job. Start with these ideas from the trainer.

Scroll down through 8 positions

  1. Position 1 of 8

    1...d5

    d7 → d5

    Claims equal share of the center. This pawn on d5 is the anchor of Black's position.

  2. Position 2 of 8

    2...e6

    e7 → e6

    Supports d5 firmly. The classical response to the Queen's Gambit — decline the pawn and keep the center solid.

  3. Position 3 of 8

    3...Nf6

    g8 → f6

    Develops the knight to its best square, defends d5, and prepares castling. Essential in almost every QGD line.

  4. Position 4 of 8

    4...Be7

    f8 → e7

    Solid development — the bishop defends against Bg5 pins and prepares to castle. A key move in the Orthodox QGD.

  5. Position 5 of 8

    5...O-O

    e8 → g8

    Gets the king to safety. Now Black can start thinking about counterplay with ...c5 or ...dxc4 followed by ...b5.

  6. Position 6 of 8

    6...Nbd7

    b8 → d7

    Develops the knight to a flexible square. From d7, it supports ...c5 and can go to f8-e6 or b6.

  7. Position 7 of 8

    6...c5

    c7 → c5

    The key counterattack — strikes at White's d4 pawn. This is Black's main way to fight for equality.

  8. Position 8 of 8

    6...c6

    c7 → c6

    Extra support for d5 and prepares ...dxc4 followed by ...b5. The Semi-Slav setup.

Trainer variations

Lines you’ll meet

These are representative branches from the drill, not a demand to memorize everything at once.

Line 11. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7
Line 21. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. Nf3 O-O 6. e3 Nbd7
Line 31. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bg5 O-O 6. e3 Nbd7
Line 41. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bf4 O-O 6. e3 c5
Line 51. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. e3 c6
Line 61. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7

Quick answers

Queen's Gambit Declined questions

What is the Queen's Gambit Declined?

Hold the center with ...e6 and ...d5 — solid, reliable, and strategic. The Queen's Gambit Declined is one of the most solid and reputable defenses in chess. By holding the pawn on d5 with ...e6, Black gets a stable central structure and reliable development. The position is strategically rich — you learn to play with a slightly cramped but rock-solid position, find counterplay at the right moment, and gradually equalize. Masters from Capablanca to Carlsen have relied on it.

What is the main line of the Queen's Gambit Declined?

This trainer starts with 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7. The exact move order can change by variation, so learn the purpose of each move as well as the sequence.

Is the Queen's Gambit Declined good to learn as Black?

It can be a useful part of a Black repertoire if its positions match how you like to play. Learn the main plan first, then use the drill to test the recurring replies.

Study next

E60bKing's Indian DefenseA hypermodern defense — let White build the center, then counter-attack it.1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7D10bSlav DefenseMeet 1.d4 d5 2.c4 with ...c6 — keep a solid pawn chain and a free light-squared bishop.1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6E20bNimzo-Indian DefensePin the knight with 3...Bb4 — fight for e4 control and create long-term structural pressure.1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5

Turn the guide into recall

Now play the Queen's Gambit Declined from memory.

The drill gives you an opponent reply, checks your response, and repeats the branches that need more work.

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