Caissa Codex
E14

Queen's Indian Defense, with e3, Bb4+ Line 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, Bb4+ Line

Play Black's moves of the line from memory — 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2 b6 5. e3 Bb7 — 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 Queen's Indian Defense, with e3, Bb4+ Line page, or pick another opening in the opening trainer.

https://chesscodex.org/train/queens-indian-defense-with-e3-bb4-line