Connect your chess.com or Lichess account. Mainline analyzes your last fifty games with Stockfish, then your coach reads the whole-game patterns behind the blunders and names the five to eight habits that keep costing you points.
Every weakness is yours alone: it is traced to specific games you played, and it opens to a five-lesson arc. Lesson one is built from your own positions; lessons two to five are drills built to teach the fix. Re-run the analysis any time and the diagnosis is rebuilt from your latest games.