Caissa Codex
E14

Queen's Indian Defense, with e3 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 Queen's Indian Defense, with e3

Play White's moves of the line from memory — 1. d4 Nf6 2. Nf3 e6 3. e3 b6 4. Bd3 Bb7 5. Nbd2 c5 6. b3 Be7 7. Bb2 d6 8. O-O O-O 9. c4 — and the trainer plays Black's replies; "Play the other side" turns it around.

Read about the line, its statistics on Lichess and Stockfish's evaluation on the Queen's Indian Defense, with e3 page, or pick another opening in the opening trainer.

https://chesscodex.org/train/queens-indian-defense-with-e3-13