Practice your openings against a sparring partner that plays real moves from players at the level you choose.
Select the opening you want to practice as a starting position.
Choose your opponent's level: they will play real moves from Lichess games at the rating and time control you select.
Upload your Lichess/Chess.com games to see how you usually play in each position.
Upload PGN files of your repertoire (an study of lichess for instance) to check if your moves are the ones you have in your repertoire / study.
Configure your sparring opponent's skill level and playing style. Your opponent will play moves from real Lichess games matching your criteria.
How it worksUpload your repertoire (a style from lichess or a pgn with your repertoire moves).