Petrov's Defense: Modern Attack, Center Attack: what should White play?

In the Petrov's Defense: Modern Attack, Center Attack, White is faced with a central tension where the black e4 exerts significant pressure. The most effective continuation for White is exd6, which is the engine's top recommendation with an evaluation of +0.49 and is played in 53.6% of recorded games. This move resolves the central tension by capturing the d5 en passant, challenging Black's advanced knight and maintaining a slight spatial advantage.

The strategic objective of exd6

The move exd6 serves to open lines and clarify the central structure. By removing the d5, White forces Black to decide how to recapture, often leading to the main line exd6 Nxd6 Nc3 Nc6 Qa4 Bd7. This sequence allows White to develop the queenside rapidly while the d4 remains active, though it may eventually relocate to a4 to pin or pressure the black pieces.

Alternatives and secondary options

While exd6 is the theoretical preference, other moves have been employed in practice. The move Be3 has been recorded in 1.1K games, representing a significant portion of the database, where White scores 51.6%. However, the engine evaluates this position at -0.33, suggesting Black achieves comfortable equality after Be3 c5 Qd1 Nc6 Bd3 Bg4. Another alternative is Qa4+, played in 90 games with a 49.4% success rate for White, leading to the sequence Qa4+ c6 Nbd2 Nc5 Qf4 Be7.

Evaluation of retreating moves

Retreating the queen prematurely is generally considered less ambitious. The move Qd3 carries an engine evaluation of -0.70, while Qd1 drops the evaluation further to -1.30. In the case of Qd1, Black gains a development advantage after Qd1 Bc5 Be3 Bxe3 fxe3 O-O, leaving White with a compromised pawn structure and less control over the center compared to the main line captures.