ECO A04 · Modern Defense

Modern Defense: Semi-Averbakh Variation, Polish Variation

1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6

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

5. dxc5+0.68

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Modern Defense: Semi-Averbakh Variation, Polish Variation (A04), reached after 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6, Stockfish 18 recommends 5. dxc5 for White. White is slightly better (+0.68).

Top engine moves

  1. +0.685. dxc5 Qxc5 6. Be2 d6 7. O-O Nc6 8. h3 Bd7 9. Re1 Nd4
  2. +0.585. Nc3 cxd4 6. Nd5 Qa5+ 7. b4 Qd8 8. Nxd4 Nf6 9. Bg5 O-O
  3. +0.015. d5 Bxb2 6. Bxb2 Qxb2 7. Nbd2 d6 8. Be2 Qg7 9. O-O Nf6

Frequently asked questions

What is the best move in the Modern Defense: Semi-Averbakh Variation, Polish Variation?
After 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6, Stockfish 18 at depth 18 recommends 5. dxc5 for White, continuing Qxc5 6. Be2 d6 7. O-O Nc6 8. h3 Bd7 9. Re1 Nd4. White is slightly better (+0.68). The next best moves are 5. Nc3 (+0.58) and 5. d5 (+0.01).
Is the Modern Defense: Semi-Averbakh Variation, Polish Variation a good opening?
Stockfish rates the position at +0.68: 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 Modern Defense: Semi-Averbakh Variation, Polish Variation?
A04. ECO codes classify chess openings from A00 to E99; A is the volume for flank openings.

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