Caissa Codex
B00

Rat Defense: Harmonist 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 Rat Defense: Harmonist

Play White's moves of the line from memory — 1. e4 d6 2. f4 — and the trainer plays Black's replies; "Play the other side" turns it around.

"Drill all" adds the 1 named line that continue it, such as Rat Defense: Fuller Gambit.

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

https://chesscodex.org/train/rat-defense-harmonist