ECO D42 · Queen's Gambit Declined

Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3

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

7… Be7+0.14

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

Analyze this position

In the Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line (D42), reached after 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3, Stockfish 18 recommends 7… Be7 for Black. The position is roughly equal (+0.14).

Top engine moves

  1. +0.147… Be7 8. O-O O-O 9. Re1 b6 10. Nxd5 exd5 11. b3 Nb4 12. Bb1
  2. +0.287… cxd4 8. exd4 Be7 9. O-O O-O 10. Qe2 Re8 11. Rd1 Bd7 12. a3
  3. +0.317… g6 8. O-O Bg7 9. Nxd5 exd5 10. dxc5 Qe7 11. Rb1 a5 12. Bd2

Frequently asked questions

What is the best move in the Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line?
After 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3, Stockfish 18 at depth 18 recommends 7… Be7 for Black, continuing 8. O-O O-O 9. Re1 b6 10. Nxd5 exd5 11. b3 Nb4 12. Bb1. The position is roughly equal (+0.14). The next best moves are 7… cxd4 (+0.28) and 7… g6 (+0.31).
Is the Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line a good opening?
Stockfish rates the position at +0.14: 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 Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line?
D42. 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+).