Caissa Codex
E02

Catalan Opening: Open Defense 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 Catalan Opening: Open Defense

Play Black's moves of the line from memory — 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 — and the trainer plays White's replies; "Play the other side" turns it around.

"Drill all" adds the 5 named lines that continue it, such as Catalan Opening: Open Defense, Classical Line, Catalan Opening: Open Defense, Modern Sharp Variation, Catalan Opening: Open Defense, Alekhine Variation.

Read about the line, its statistics on Lichess and Stockfish's evaluation on the Catalan Opening: Open Defense page, or pick another opening in the opening trainer.

https://chesscodex.org/train/catalan-opening-open-defense