Caissa Codex
A40

English Defense: Hartlaub Gambit Declined 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 English Defense: Hartlaub Gambit Declined

Play White's moves of the line from memory — 1. c4 e6 2. d4 b6 3. Nc3 Bb7 4. e4 f5 5. d5 — 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 English Defense: Hartlaub Gambit Declined page, or pick another opening in the opening trainer.

https://chesscodex.org/train/english-defense-hartlaub-gambit-declined