Openings

Larsen's Opening - Classical Setup

A hypermodern flank opening where White fianchettoes the dark-squared bishop on b2 and builds a flexible central setup

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Introduction

Larsen's Opening (1. b3), also called the Nimzo-Larsen Attack, is named after the Danish grandmaster Bent Larsen who popularized it in the 1960s and 70s. Aron Nimzowitsch pioneered the idea earlier, using the queenside fianchetto to control the center from the flank rather than occupying it with pawns. The key idea is simple: the bishop on b2 commands the long a1-h8 diagonal, putting pressure on e5 and g7. White keeps maximum flexibility, choosing when and how to commit in the center. The resulting positions blend elements of the Queen's Indian, English, and Reti — offering a practical, low-theory system where understanding trumps memorization.

Lesson Content

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1. b3

Larsen's Opening — White prepares to fianchetto the dark-squared bishop to b2, controlling the long diagonal. Instead of occupying the center immediately, White takes a hypermodern approach. Black's main responses: - 1. ..e5 — the most popular, claiming the center directly - 1. ..d5 — equally sound, establishing central control - 1. ..Nf6 — flexible, keeping options open

DevelopmentPiece Activity
Alternative Moves
e4 — The most popular first move — leads to open games. b3 takes a flank approach with different strategic ideas.
d4 — The Queen's Pawn — mainstream and strong. b3 delays central commitment for flexibility.
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1. ..d5

Black claims the center directly with the d-pawn — a principled response. While White focuses on the flank, Black seizes central space, controlling e4 and c4.

Center Control
Alternative Moves
e5 — Also excellent — claims the center and is slightly more popular. d5 is equally sound with a different character.
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2. Bb2

The bishop fianchettoes immediately — the whole point of 1. b3. From b2, the bishop commands the a1-h8 diagonal, exerting long-range pressure on e5 and toward the kingside. This is the defining move of Larsen's Opening.

Piece ActivityDevelopment
Alternative Moves
Nf3 — Good development but delays the fianchetto. Bb2 is the natural follow-up to b3.
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2. ..Nf6

Black develops the knight to its most natural square, controlling e4 and d5 while preparing to castle. The knight on f6 is a universal developing move that works in almost any setup.

DevelopmentCenter Control
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3. Nf3

White develops the knight to its best square, controlling e5 and d4 while preparing kingside castling. The Nf3/Bb2 duo creates a harmonious partnership — both pieces pressure the dark squares.

DevelopmentCenter Control
Alternative Moves
e3 — Also fine but delays knight development. Nf3 develops a piece and controls key central squares.
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3. ..e6

Black solidifies the d5 pawn with e6, creating a stable pawn chain. The light-squared bishop is temporarily locked in, but Black plans to develop it via b7 after ..b6 — a mirror fianchetto.

Pawn StructureCenter Control
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4. e3

Supporting the center and opening the diagonal for the light-squared bishop. The e3/b3 pawn structure is the classic Larsen formation — modest but solid, keeping all options open for d3 or d4 later.

Pawn StructureDevelopment
Alternative Moves
c4 — Aggressive but commits the center early. e3 keeps flexibility — White can choose c4, d3, or d4 later.
d3 — Solid but passive. e3 opens the bishop diagonal and supports a future d4 break.
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4. ..Be7

Black develops the bishop to a solid, flexible square and prepares to castle. Be7 is modest but practical — it doesn't commit to an aggressive diagonal yet.

DevelopmentKing Safety
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5. Be2

The light-squared bishop develops to a flexible square, preparing to castle. From e2, the bishop supports d3 or can later relocate to f3 for central pressure. White prioritizes completing development over an immediate central push.

Development
Alternative Moves
d4 — Also strong — immediately seizes the center. Be2 develops first, keeping the d4 push as a powerful option for later.
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5. ..O-O

Black castles to safety. The king is secure on g8, and the f8 rook can support the center or shift to the c-file later.

King Safety
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6. O-O

White also castles kingside, securing the king and connecting the rooks. With both bishops developed and the king safe, White is ready to begin central operations with d4 and c4.

King SafetyDevelopment
Alternative Moves
d4 — Playable before castling, but king safety comes first. O-O then d4 is more reliable.
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6. ..b6

Black mirrors White's strategy — preparing a queenside fianchetto with ..Bb7. Both sides will have bishops on the long diagonals, creating a symmetrical fianchetto structure.

DevelopmentPiece Activity
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7. d4

Now is the right time to seize the center! With development complete and the king safe, White strikes with d4. The Bb2 supports this advance, and the position takes on a Queen's Gambit-like character where White has a central advantage.

Center ControlSpace
Alternative Moves
d3 — Too passive now that development is complete. d4 fights for the center with full piece support.
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7. ..Bb7

Black completes the fianchetto. The Bb7 commands the a8-h1 diagonal, directly opposing White's Nf3 and pressuring e4. Both sides now have symmetrical fianchetto structures, but White has a central space advantage thanks to d4.

Piece ActivityDevelopment
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8. c4

The Queen's Gambit formation! White establishes the classic d4+c4 pawn center, controlling d5 and e5. This is the strategic payoff of the Larsen approach — White delayed the central push until all pieces were developed, then struck with full support.

Center ControlSpace
Alternative Moves
Nbd2 — Develops but doesn't challenge Black's center. c4 is the thematic break, fighting for d5.
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8. ..dxc4

Black captures, resolving the central tension. This gives up the d5 stronghold but opens lines and avoids passive positions. White will recapture with the bishop, gaining active development.

Pawn Structure
Alternative Moves
c5 — Also playable — challenges d4 directly. dxc4 simplifies the center and gives Black counterplay on the c-file.
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9. Bxc4

The bishop recaptures on an excellent square. From c4, it targets the sensitive e6/f7 area and can later pressure d5 if Black recaptures with a piece. White has emerging piece activity to compensate for the symmetrical pawn structure.

Piece ActivityDevelopment
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9. ..Nbd7

Black develops the last minor piece, preparing to play ..c5 to challenge White's d4 pawn. The knight on d7 supports both ..c5 and ..e5 breaks while keeping the position flexible.

DevelopmentCenter Control
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10. Nc3

White completes piece development with the knight heading to c3. From here, it supports the center (d5 push), controls e4, and adds pressure to the position. White has achieved a model Larsen setup — Bb2 on the long diagonal, Bc4 targeting the kingside, knights centralized, and pawns on d4.

DevelopmentCenter Control
Alternative Moves
Nbd2 — Less active — the knight on d2 blocks the Bb2 diagonal. Nc3 is more centralized and doesn't obstruct pieces.
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10. ..c5

Black challenges White's d4 pawn — the standard counter in these structures. The position is dynamically balanced: White has the bishop pair, central presence, and the powerful Bb2 diagonal, while Black has solid development and central counterplay.

Center ControlSpace

Key Takeaways

  • 1.b3 + Bb2 puts the dark-squared bishop on the powerful a1-h8 diagonal
  • Complete development before pushing d4 — timing is key
  • The d4 + c4 push creates a strong central presence with full piece support
  • Bxc4 recaptures actively, targeting Black's kingside
  • The Bb2 is Larsen's long-term asset — it influences the game throughout

Summary

You've learned Larsen's Opening — a hypermodern system where White fianchettoes the dark-squared bishop to b2 before committing in the center. The strategy is to complete development (Nf3, e3, Be2, O-O) first, then strike with d4 and c4 when all pieces are in place. The Bc4 recapture gives White active piece play, and the Bb2 remains a powerful long-term asset on the long diagonal.

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