Caissa Codex
A05

Polish Opening: Zukertort System 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 Polish Opening: Zukertort System

Play White's moves of the line from memory — 1. Nf3 Nf6 2. b4 g6 3. Bb2 — 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 Polish Opening: Zukertort System page, or pick another opening in the opening trainer.

https://chesscodex.org/train/polish-opening-zukertort-system