Caissa Codex
C43

Petrov's Defense: Modern Attack, Center Variation trainer

Back to the opening, all openings to practise or my repertoire

Type a move and press Enter: e4, Nf3, O-O, or from and to squares like g1f3 (e7e8q to promote). The board is also played with the mouse.

Practise the Petrov's Defense: Modern Attack, Center Variation

Play White's moves of the line from memory — 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 — and the trainer plays Black's replies; "Play the other side" turns it around.

"Drill all" adds the 2 named lines that continue it, such as Petrov's Defense: Modern Attack, Murrey Variation, Petrov's Defense: Modern Attack, Trifunovic Variation.

Read about the line, its statistics on Lichess and Stockfish's evaluation on the Petrov's Defense: Modern Attack, Center Variation page, or pick another opening in the opening trainer.

https://chesscodex.org/train/petrovs-defense-modern-attack-center-variation