← Slav Defense

Practice: Semi-Slav Main Line

Classical setup with Qc7

The classical Semi-Slav main line. Black plays ...Qc7 and ...Nbd7, preparing ...e5 at the right moment while keeping the centre closed.

1. d4 d5
2. c4 c6
3. Nc3 Nf6
4. e3 e6
5. Nf3 Nbd7
6. Bd3
♟

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Key strategic ideas

  • The key advantage of the Slav over the QGD is that Black develops the light-squared bishop outside the pawn chain (Bf5 or Bg4) before playing ...e6.
  • Black aims to control the centre from the side, often targeting White's pawn structure on c4 and the d4-e4 centre.
  • The Slav can lead to many different structures, from open tactical battles to closed manoeuvring positions.

Common mistakes & traps

  • In the Classical Slav (4.Nc3 dxc4 5.a4), Black should not try to hold the pawn with ...b5 — White plays a5 and the b-pawn becomes a fatal weakness.
  • The so-called "Slav Trap" (1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O Nbd7??) allows 9.Ng5! with a crushing attack on f7.

Pawn structure notes

The Slav typically features a d5 pawn supported by c6, against White's pawns on d4 and c4. White often aims for e3-e4 expansion. In the Exchange Slav (cxd5), the structure is symmetrical with active piece play.

Tips

  • The Chigorin Defense keeps the centre closed and develops quietly
  • Bd6 is the hallmark of this line — it pressures the e5 square
  • Prepare ...dxc4 followed by ...b5 to gain queenside space
  • The Semi-Slav is solid — avoid sharp lines unless you know the theory
  • Castle kingside and aim for ...e5 when the centre is stable

About this line

This line is rated intermediate. Practice it repeatedly until you can play the entire sequence without thinking. The in-app trainer tracks your perfect streaks and celebrates milestones.