Notation vs My Blunders

Notation is a chess coaching app that teaches you why — not just what. Every chess evaluation comes from Stockfish 18, running entirely on your device. Every pattern, weakness, and tactical motif is detected by hand-tuned on-device classifiers built on decades of coaching theory. The language model's only job is the last step: explaining what the analysis found, in plain English, like a coach sitting next to you. The chess is never generated. It's explained. THREE COACHING FRAMEWORKS Notation is the first chess app to operationalise multiple grandmaster-level coaching frameworks as deterministic measurement: • Dan Heisman's seven positional elements — Mobility, Vulnerability, Centre Control, Coordination, Speed, Time, Flexibility — measured per-position with super-GM baselines • Jeremy Silman's coaching emphasis frames — fifteen frames choosing what to teach at each moment • Jacob Aagaard's positional predicates — Where are the weaknesses? Which is the worst-placed piece? What's the opponent's plan? All computed on-device. All deterministic. The same principles human coaches have used for decades, encoded into classifiers that run before the language model ever sees the position. GAME REVIEW Every game gets a coherent on-device review — no API key needed, no internet, no cost. Template-driven narrative against the full coaching substrate. When you want depth, upgrade once with your own Anthropic or OpenAI API key, o ruse the On Device LLM with no additional costs and the richer review becomes the permanent artefact for that game. Nadia comments on at most six moments — only the ones worth learning from. PDF export of every review. PLAYER PROFILE Style axes — Aggression, Tactical Alertness, Positional Play, Endgame — derived from the substrate with confidence bands. The seven Heisman elements sit below as evidence. Full-screen iPad dashboard. PDF coaching report you could hand to a human coach. OPPONENT SCOUTING & MATCHUP REPORTS Scout reports surface the full eight-axis substrate on any opponent. How-to-play-against framing with concrete suggestions. Player-vs-opponent comparison across all axes with weakest-phase detection. SHADOW — YOUR CHESS TWIN Shadow learns how you play and saves checkpoints. Play yourself from six months ago. See how far you've come. Coming soon: calibrate Shadow to your real-life rivals by importing their games. PLAY ON YOUR PHYSICAL BOARD Pair with Chessnut Air, Pro, Go, Air+ and Move over Bluetooth. Notation tracks every move on real wood while Nadia coaches. PRIVACY BY DESIGN Stockfish on-device. All coaching classifiers on-device. Cohort baselines on-device. Optional cloud AI is bring-your-own-key — your Anthropic or OpenAI API key, your account, your data. We never see it. Leave the field blank and Notation works fully without it. IMPORT YOUR GAMES Connect Lichess or Chess.com. Import PGN files. Nadia analyses everything in the background. £2.99. One-off. No subscription. No ads. No tracking. Yours forever.

Most chess apps give you someone else's puzzles. My Blunders builds them from your own games, so you practise the positions where you actually went wrong. Enter your Lichess or Chess.com username. The app downloads your recent games, checks every move with Stockfish right on your device, and turns your mistakes into puzzles. The first ones appear while the rest of your games are still being checked, and new ones keep arriving in the background as you solve. You don't need an account or a password. If you'd like to start before importing anything, there's a built-in library of famous blunders from chess history. FOUR WAYS TO TRAIN - Puzzles: Find the move you missed in your own games. If you're stuck, Hint shows which piece to move without giving the answer away. Once it's solved, replay your game move or the engine's best line on a separate board, or play the position out against the engine. - Opening: Your games mapped into an opening tree. See where you leave the book, spot your weak lines and drill the worst of them. You can also save your repertoire as an A1 poster, a tree of boards with the engine evaluation and your wins, draws and losses under each one. - Coordinates: Learn the board by heart. Name squares against the clock, tell light squares from dark ones at a glance, and step through famous games move by move. - Play: A full game against an engine set to your rating. Each move is judged as you play, and the best move appears on a mini board where you can try it. Turn on the clock and the engine paces itself like a person, quick in the opening and slower when the position gets sharp. Choose a board in Green, Wood or Walnut, with a separate one for light and dark mode. PRIVACY - No account, no ads, no tracking. - The app reads only your public games. They go straight from Lichess or Chess.com to your device. There is no My Blunders server. - All analysis runs on the device and works offline once your games are downloaded. My Blunders is free, with no in-app purchases or subscriptions.