A private journal for the decisions behind your games
The engine finds the move. You find the lesson.
Turn your mistakes into reflections you can remember, patterns you can recognize, and questions you can share with a coach.
No account needed to try it.
- 18. Bd6??
- “I was too focused on my own plan.”
- 18. Re1
- The better move. Weakness: Calculation
A review process you can actually repeat
Existing engine annotations are respected. Missing analysis runs on Stockfish we host ourselves, never a third party.
- 1.
Find critical moves
Use a Chess.com or Lichess link, search by username, or paste any valid PGN.
- 2.
Reflect on decisions
For each mistake, say whether you understand it, and what weakness it showed.
- 3.
See your patterns
Build a private journal that reveals the recurring reasons behind your results.
For signed-in players
Deeper Stockfish analysis, in seconds.
Sign in and a game without engine annotations is analyzed by native Stockfish 19 on our own server. It checks every position, looks deeper at your likeliest mistakes, and shows where each better move was heading. When several moves are about equally strong, Maia, an engine trained on millions of human games, picks the one a player is most likely to find, so the move you learn is one you could play over the board. Moves you add to a review get the same treatment.
Without an account, a quicker analysis runs in your browser instead. Either way, your game never goes to a third party.
Sign in for server analysis- Native Stockfish 19, not a browser build
- Every position checked, mistakes verified deeper
- Maia picks the most human of equally strong moves
- A short Stockfish line for every better move
- Usually ready in a few seconds
Practice
Your mistakes become your puzzles.
Every mistake you review becomes a puzzle from your own game: the position just before your move, with the better move as the solution. Solve them all, or focus on the weakness you most want to fix.
- Positions from your own games
- Focus on one weakness
- A new random order every session
- Mistakes you haven’t understood yet
Try it: tap a piece, then its destination. Find a better move than 8. Nh4.
AI explanation · Early access
Ask why, and see it on the board.
A real explanation of 18. Bd6 from the game above, unedited. Step through it.
AI explanation
18. Bd6
Bd6 attacks the c5 bishop but ignores the real problem. Your rook on a1 is undefended and attacked by the queen on b2. Black takes it with check, then retreats the queen to safety. Already down a piece, you are now also down a whole rook.
ThreatsKey squares and defenses
For students and coaches
Share the thinking behind your moves.
One coach link shares your entire journal: reviewed games, reflections, critical moments, and recurring patterns. Students can flag moves they don’t understand; coaches can see what their student was thinking and prepare focused lessons around the questions that matter.
Your coach needs no account. The same read-only link includes new reviews as you save them, and you can turn it off at any time.
- Every reviewed game
- Your reflections, in your own words
- Moves you flagged for a lesson
- Your recurring patterns
Export your journal to an AI agent
Give an AI assistant your full coach journal—games, critical moments, evaluations, and reflections—to explore patterns and plan what to work on next.
How AI sharing worksPrivate by default
Your games stay yours.
Your saved reviews include the original PGN for you to download or share. Your journal is private unless you create a read-only coach link, and you can revoke that link whenever you want. Deleting a game also deletes its stored PGN.
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- No third-party trackers
- No marketing emails
Email is used only for sign-in codes, account-related messages, and replies to feedback you send.