How your coach works
Eight signals, from every game you've ever played, not a sample.
He ranks your leaks by the rating they cost, attacks the most expensive first, and re-plans every week as you improve.
Four outputs, refreshed every week.
All of it read from your free Profile Report, Insights and Puzzles.
Let me guess why you are here

You read the opening books, you play hundreds of rapid games, you check the engine after a loss, and the number will not move. A plateau is not your ceiling. It means the instincts that carried you this far are no longer sharp enough for what comes next. Which instinct depends almost entirely on where you sit.
Under 1000
You move before scanning for what is hanging. Games are decided by a piece left en prise, not by strategy.
What I doI drill blunder-checks on your own losses until the scan happens before every move.
1000 – 1200
You see your own idea clearly and miss the reply. The plan is sound right up to the opponent’s answer.
What I doEvery drill makes you name their threat before you play your move.
1200 – 1500
Too fast in the sharp positions that decide the game, too vague in the quiet ones that build it.
What I doI find where your clock and your accuracy come apart, then train those exact moments.
1500 – 1800
Small advantages leak away, and the handover from opening to middlegame loses the thread.
What I doConversion drills built from your own won positions, re-measured every week.
Stockfish grades your last 40 games into a six-skill profile, benchmarked against your exact rating: openings, conversion, tilt, time. The pattern, not the one bad night.
Recurring leaks
A handful of repeated mistakes costs most of your rating. Each gets tagged and ranked by its cost.
Insights
Rating arc, openings by colour, opponents, activity, and how you win or lose. Your whole Chess.com and Lichess history in one dashboard. The coach reads it all before he plans your week.
Puzzles & Woodpecker
One fixed set, re-solved in faster, cleaner cycles until you stop calculating the fork and start seeing it. That instinct is most of what separates a 1200 from a 1600.
Meet Lumi
You train on positions from your own games while Lumi coaches you through them: graduated hints, never dumped answers, always the why. Difficulty adapts so you stay where learning happens.
Or just ask. Lumi answers from your history and pulls up the exact position that proves it.
One coach, not a shelf of tabs
Profile Report, Insights and Puzzles are free for everyone, forever. AI Coach adds the plan, the training, and the proof.
The usual stack
Straight answers