Caissa Codex
E43

Nimzo-Indian Defense: St. Petersburg 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 Nimzo-Indian Defense: St. Petersburg Variation

Play Black's moves of the line from memory — 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 O-O 7. O-O c5 8. Na4 cxd4 9. a3 Be7 — and the trainer plays White's replies; "Play the other side" turns it around.

Read about the line, its statistics on Lichess and Stockfish's evaluation on the Nimzo-Indian Defense: St. Petersburg Variation page, or pick another opening in the opening trainer.

https://chesscodex.org/train/nimzo-indian-defense-st-petersburg-variation-12