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E20bPlay as Black15 lines to train

Learn the Nimzo-Indian Defense

Pin the knight with 3...Bb4 — fight for e4 control and create long-term structural pressure.

Practice this openingUnderstand the moves
Main line

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5

1.d41…Nf62.c42…e63.Nc33…Bb44.e34…O-O5.Bd35…d56.Nf36…c5

The idea

Why this opening works

The Nimzo-Indian is one of the most respected openings in chess. By pinning the c3-knight with ...Bb4, Black prevents White from easily playing e4 and fights for central control without committing pawns. If White ever captures on b4, Black gets the bishop pair traded for doubled c-pawns — a lasting structural advantage. World Champions from Capablanca to Carlsen have used it as their primary weapon against 1.d4.

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...Nf6

    g8 → f6

    Develops the knight to its best square, controls e4 and d5, and keeps options open for multiple Indian defenses.

  2. Position 2 of 8

    2...e6

    e7 → e6

    Supports d5 and opens the diagonal for the dark-squared bishop. This is the foundation of the Nimzo-Indian setup.

  3. Position 3 of 8

    3...Bb4

    f8 → b4

    The Nimzo-Indian move! Pins the knight on c3 and prevents White from playing e4 easily. This is one of the strongest moves in all of opening theory.

  4. Position 4 of 8

    4...O-O

    e8 → g8

    Castles to safety. Now Black is fully developed on the kingside and ready for central play.

  5. Position 5 of 8

    5...d5

    d7 → d5

    A solid central response. Locks the center and leads to strategic maneuvering rather than tactical chaos.

  6. Position 6 of 8

    6...c5

    c7 → c5

    Challenges White's d4 pawn and opens the position. A key counterattacking move in many Nimzo-Indian lines.

  7. Position 7 of 8

    5...Bxc3+

    b4 → c3

    Captures the knight, giving White doubled c-pawns. Black trades the bishop pair for a lasting structural advantage.

  8. Position 8 of 8

    6...b6

    b7 → b6

    Prepares to fianchetto the light-squared bishop to b7, creating a powerful diagonal aimed at e4 and the kingside.

Trainer variations

Lines you’ll meet

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

Line 11. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5
Line 21. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 c5 6. Bd3 d5
Line 31. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2 d5 6. a3 Bd6
Line 41. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6
Line 51. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e3 c5 6. Nf3 d5
Line 61. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 d5 6. a3 Bxc3+

Quick answers

Nimzo-Indian Defense questions

What is the Nimzo-Indian Defense?

Pin the knight with 3...Bb4 — fight for e4 control and create long-term structural pressure. The Nimzo-Indian is one of the most respected openings in chess. By pinning the c3-knight with ...Bb4, Black prevents White from easily playing e4 and fights for central control without committing pawns. If White ever captures on b4, Black gets the bishop pair traded for doubled c-pawns — a lasting structural advantage. World Champions from Capablanca to Carlsen have used it as their primary weapon against 1.d4.

What is the main line of the Nimzo-Indian Defense?

This trainer starts with 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5. The exact move order can change by variation, so learn the purpose of each move as well as the sequence.

Is the Nimzo-Indian Defense good to learn as Black?

Yes. Chess Trainer recommends it as elite defense against 1.d4 — strategic and flexible. Start with the main line, then add one opponent branch at a time.

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 Nbd7D30bQueen's Gambit DeclinedHold the center with ...e6 and ...d5 — solid, reliable, and strategic.1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 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 e6

Turn the guide into recall

Now play the Nimzo-Indian Defense from memory.

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

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