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Semi-Slav Defense

1.d4 d5 2.c4 c6 3.Nf3 Nf6 · D43–D49

Starting positionWhite to move

0 / 16

The Meran gains time against the bishop

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The idea

Black combines the Slav and the QGD — ...c6 and ...e6 together — creating a fortress that then expands on the queenside with ...b5.

Main line: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6

What White wants

  • Attack the centre with e4 and open lines before Black finishes
  • Use the Meran setup with e3, Bd3 and e4 to gain space
  • Punish the slow ...b5 expansion with a well-timed a4 or e4

What Black wants

  • Expand on the queenside with ...dxc4, ...b5 and ...a6
  • Develop the c8 bishop with ...Bb7 after gaining space
  • Challenge the centre with ...c5 or ...e5 when the pieces are ready

Key idea

Understand this and the moves stop needing to be memorised.

The Meran gains time against the bishop

After Bd3, ...dxc4 makes the bishop move again to recover the pawn. ...b5 then attacks that bishop and gains queenside space. The pawn on b5 also clears b7 for the c8 bishop; Black still needs development and a central break to justify the expansion.

Common mistake

Expanding on the queenside without watching White's e4 break. ...b5 before ...a6 is the standard Meran move order, not an error; Black must follow up with development and a central challenge instead of spending every tempo defending flank pawns.

Mistake example: c5.

Representative position

The position this opening is aiming at. Copy the FEN, or open it in the analysis board and let the engine tell you what it is worth.

r1bqkb1r/3n1ppp/p1p1pn2/1p6/3P4/2NBPN2/PP3PPP/R1BQK2R w KQkq - 0 9

Analyze this position

Variations

2 lines branching from here.

Related openings

Slav Defense1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 · D10–D19Black defends d5 with the c-pawn instead of the e-pawn, keeping the bishop on c8 free to develop actively to f5.Semi-Slav: Moscow Variation1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 · D43Black asks the g5 bishop to decide with ...h6. In the Moscow Variation White exchanges on f6, conceding the bishop pair in return for comfortable development and a solid centre.Semi-Slav: Botvinnik Variation1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 · D44The most analysed line in 1.d4: Black grabs material on the queenside while White sacrifices a knight for a raging attack on the kingside.Queen's Gambit Declined1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 · D30–D69Black holds d5 with ...e6 and accepts a slightly cramped but extremely solid position — the classical answer to 1.d4 for over a century.