Sideline analyzes your actual games, extracts your real opening repertoire, finds the gaps, and drills you on surprise lines until they're second nature.
Three steps. No generic courses. No guessing what to study.
Link your Lichess or Chess.com profile. Sideline pulls your game history and maps every opening you've played, how often, and how you performed in each.
The engine cross-references your repertoire against master games and current theory. It identifies where you're losing Elo: missed transpositions, weak responses to popular lines, and openings you avoid but shouldn't.
Spaced-repetition training on YOUR specific lines. Not random puzzles from a book. When you deviate in a real game, that position gets added to your queue automatically.
Every AI chess tool tells you what you did wrong. Sideline prepares you for what comes next.
At your rating, you've already learned the tactics. You've already played thousands of games. The next 200 Elo comes from preparation, not talent. Sideline makes that preparation automatic.