Opening Trainer
Master every major chess opening move by move — watch the moves, replay them from memory, then test your accuracy. Every line is Stockfish-checked, with arrows and coloured squares explaining the ideas.
1Pick an opening
Each family opens its own set of lines — Ruy Lopez, Najdorf, French, Queen's Gambit and more. The badge says which side you play.
2Pick a line
Every line is named by the moves that make it unique, so you can find the exact variation you want to study.
3Watch, then test
Start shows each move, pauses, then asks you to replay it. Test plays the line from memory with the commentary hidden. Arrows and coloured squares explain every move as you go.
4Every move checked
Every line is Stockfish-checked and legal, with the ideas — plans, coordination, the squares a piece controls — drawn on the board as you step through.