ECO B50 · Sicilian Defense

Sicilian Defense: Kopec System

1. e4 c5 2. Nf3 d6 3. Bd3

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

3… g6+0.06

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

Analyze this position

In the Sicilian Defense: Kopec System (B50), reached after 1. e4 c5 2. Nf3 d6 3. Bd3, Stockfish 18 recommends 3… g6 for Black. The position is roughly equal (+0.06).

Top engine moves

  1. +0.063… g6 4. c3 Nc6 5. O-O Bg7 6. Bb5 Nf6 7. d4 a6 8. Bxc6+
  2. +0.073… Nc6 4. c3 g6 5. O-O Bg7 6. Bb5 Nf6 7. d4 a6 8. Bxc6+
  3. +0.123… Nf6 4. c3 Nc6 5. Bc2 e5 6. d4 exd4 7. cxd4 Bg4 8. d5

Frequently asked questions

What is the best move in the Sicilian Defense: Kopec System?
After 1. e4 c5 2. Nf3 d6 3. Bd3, Stockfish 18 at depth 18 recommends 3… g6 for Black, continuing 4. c3 Nc6 5. O-O Bg7 6. Bb5 Nf6 7. d4 a6 8. Bxc6+. The position is roughly equal (+0.06). The next best moves are 3… Nc6 (+0.07) and 3… Nf6 (+0.12).
Is the Sicilian Defense: Kopec System a good opening?
Stockfish rates the position at +0.06: 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 Sicilian Defense: Kopec System?
B50. 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+).