Caissa Codex
C78

Ruy Lopez: Central Countergambit 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: Central Countergambit

Play Black's moves of the line from memory — 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d5 — 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 Ruy Lopez: Central Countergambit page, or pick another opening in the opening trainer.

https://chesscodex.org/train/ruy-lopez-central-countergambit