Caissa Codex
C64

Ruy Lopez: Classical Variation, Modern Main Line 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 Ruy Lopez: Classical Variation, Modern Main Line

Play White's moves of the line from memory — 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 5. c3 O-O 6. d4 Bb6 7. Bg5 — 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 Ruy Lopez: Classical Variation, Modern Main Line page, or pick another opening in the opening trainer.

https://chesscodex.org/train/ruy-lopez-classical-variation-modern-main-line