ECO D45 · Semi-Slav Defense

Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. e4 dxe4 8. Nxe4 Nxe4 9. Qxe4 e5 10. dxe5

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

10… O-O−0.29

The position is roughly equal. Stockfish 18, depth 18.

Analyze this position

In the Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line (D45), reached after 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. e4 dxe4 8. Nxe4 Nxe4 9. Qxe4 e5 10. dxe5, Stockfish 18 recommends 10… O-O for Black. The position is roughly equal (−0.29).

Top engine moves

  1. −0.2910… O-O 11. Bd3 f5 12. Qe2 Nxe5 13. Nxe5 Bxe5 14. O-O Re8 15. Qc2
  2. +0.0610… Bb4+ 11. Bd2 Bxd2+ 12. Nxd2 Qb6 13. b3 Qa5 14. Qe3 O-O 15. f4
  3. +0.0810… Qe7 11. Bf4 Bb4+ 12. Bd2 Bxd2+ 13. Nxd2 Nxe5 14. O-O-O O-O 15. Re1

Frequently asked questions

What is the best move in the Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line?
After 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. e4 dxe4 8. Nxe4 Nxe4 9. Qxe4 e5 10. dxe5, Stockfish 18 at depth 18 recommends 10… O-O for Black, continuing 11. Bd3 f5 12. Qe2 Nxe5 13. Nxe5 Bxe5 14. O-O Re8 15. Qc2. The position is roughly equal (−0.29). The next best moves are 10… Bb4+ (+0.06) and 10… Qe7 (+0.08).
Is the Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line a good opening?
Stockfish rates the position at −0.29: the position is roughly equal. 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: Stoltz Variation, Center Variation, Mikhalchishin Line?
D45. 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+).