ECO B13 · Caro-Kann Defense

Caro-Kann Defense: Exchange Variation, Bulla Attack

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. g4

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

4… Nc6−0.67

Black is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Caro-Kann Defense: Exchange Variation, Bulla Attack (B13), reached after 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. g4, Stockfish 18 recommends 4… Nc6 for Black. Black is slightly better (−0.67).

Top engine moves

  1. −0.674… Nc6 5. Nc3 h5 6. gxh5 Nf6 7. Bg5 Bf5 8. Bd3 Nxd4 9. Bxf5
  2. −0.654… h5 5. gxh5 Nc6 6. Nc3 Nf6 7. Bg5 Bf5 8. Nge2 Nxh5 9. a3
  3. −0.604… Nf6 5. g5 Ne4 6. Ne2 Nc6 7. Ng3 e5 8. Nxe4 dxe4 9. d5

Frequently asked questions

What is the best move in the Caro-Kann Defense: Exchange Variation, Bulla Attack?
After 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. g4, Stockfish 18 at depth 18 recommends 4… Nc6 for Black, continuing 5. Nc3 h5 6. gxh5 Nf6 7. Bg5 Bf5 8. Bd3 Nxd4 9. Bxf5. Black is slightly better (−0.67). The next best moves are 4… h5 (−0.65) and 4… Nf6 (−0.60).
Is the Caro-Kann Defense: Exchange Variation, Bulla Attack a good opening?
Stockfish rates the position at −0.67: black 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 Caro-Kann Defense: Exchange Variation, Bulla Attack?
B13. 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+).