Caissa Codex
A42

Pterodactyl 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 Pterodactyl Defense

Play Black's moves of the line from memory — 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 5. Nc3 d6 — 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 Pterodactyl Defense page, or pick another opening in the opening trainer.

https://chesscodex.org/train/pterodactyl-defense