ECO D31 · Semi-Slav Defense

Semi-Slav Defense: Noteboom Variation

1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4

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White to move. The arrow shows Stockfish’s best move.
Best move

5. a4+0.46

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Semi-Slav Defense: Noteboom Variation (D31), reached after 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4, Stockfish 18 recommends 5. a4 for White. White is slightly better (+0.46).

Top engine moves

  1. +0.465. a4 Bb4 6. e3 b5 7. Bd2 a5 8. axb5 Bxc3 9. Bxc3 cxb5
  2. +0.435. e3 b5 6. a4 Bb4 7. Bd2 a5 8. axb5 Bxc3 9. Bxc3 cxb5
  3. +0.225. g3 Nd7 6. Bg2 Ngf6 7. O-O Be7 8. a4 O-O 9. a5 Nd5

Variations

Frequently asked questions

What is the best move in the Semi-Slav Defense: Noteboom Variation?
After 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4, Stockfish 18 at depth 18 recommends 5. a4 for White, continuing Bb4 6. e3 b5 7. Bd2 a5 8. axb5 Bxc3 9. Bxc3 cxb5. White is slightly better (+0.46). The next best moves are 5. e3 (+0.43) and 5. g3 (+0.22).
Is the Semi-Slav Defense: Noteboom Variation a good opening?
Stockfish rates the position at +0.46: white is slightly better. Evaluations this early in the game are small, so practical results depend far more on knowing the plans and typical structures than on the engine's number.
What is the ECO code of the Semi-Slav Defense: Noteboom Variation?
D31. ECO codes classify chess openings from A00 to E99; D is the volume for closed and semi-closed games.

Opening names from the Lichess opening book (CC0). Pieces by Colin M.L. Burnett (GPLv2+).