ECO B21 · Sicilian Defense

Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation

1. e4 c5 2. d4 cxd4 3. c3 d3 4. c4

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

4… e5+0.43

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation (B21), reached after 1. e4 c5 2. d4 cxd4 3. c3 d3 4. c4, Stockfish 18 recommends 4… e5 for Black. White is slightly better (+0.43).

Top engine moves

  1. +0.434… e5 5. Nf3 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Bxd3 Bg4 9. Nc3
  2. +0.444… Nf6 5. Bxd3 e5 6. Nf3 Nc6 7. a3 Bc5 8. b4 Bb6 9. O-O
  3. +0.474… e6 5. Nc3 Bc5 6. a3 d6 7. Nf3 a5 8. Bxd3 Nf6 9. O-O

Frequently asked questions

What is the best move in the Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation?
After 1. e4 c5 2. d4 cxd4 3. c3 d3 4. c4, Stockfish 18 at depth 18 recommends 4… e5 for Black, continuing 5. Nf3 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 d6 8. Bxd3 Bg4 9. Nc3. White is slightly better (+0.43). The next best moves are 4… Nf6 (+0.44) and 4… e6 (+0.47).
Is the Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation a good opening?
Stockfish rates the position at +0.43: 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 Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation?
B21. ECO codes classify chess openings from A00 to E99; B is the volume for semi-open games (other than the French).

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