Go Lab vs Notation

Play, review, and analyze. A KataGo Go app supporting 9x9, 13x13, and 19x19 boards. [Powered by KataGo] OGS spectating and playing Featuring the bundled compact model b6c96, the powerful b18c384nbt, and the 'Human Style' model (HumanSL) trained on human game records. All available at no additional cost. b18c384nbt runs on CoreML and shines in 19x19 games and analysis. It supports everything from displaying candidate moves and position evaluation during a game, to post-game blunder analysis reports. HumanSL lets you play against opponents ranging from 20 kyu to 9 dan, with a choice between modern and classic (pre-AlphaGo) playing styles. Main Features - CPU Matches / Local 2-Player: Works offline. - Candidate Move Display: Displays KataGo's top 10 moves in real time with win rate and position predictions. - Position Graph: Shows the changing position on a graph after each move. - Territory Estimation: Displays black and white territory on the board (toggle on/off). - Blunder Analysis Report: After a game, review moves that worsened your position. Shows AI-recommended moves, variation diagrams, and score/win rate differences for each position, with options to copy and share as images. - Analysis Mode: Create branches by playing variations from any position. Supports adding PVs (principal variations) and comparing positions in a variation tree. - Zen Mode: A mode that gently fades out all UI elements except the board, allowing you to focus on the game. Toggle it from the 'Zen' button at the top right of the board. - OGS Spectating & Playing: Log in with your OGS account to spectate games worldwide in real time or play against players and bots. - SGF Import: Import game records by selecting a file or pasting text. - Tsumego Mode: Includes 347 problems from Gengen Gokyo. - Thinking Time Visualization: Displays the thinking time for each move. Long thinking is highlighted in red/yellow. - Full Screen Support: Play on an edge-to-edge board (ideal for 19x19). Official Website: https://apps.vlabos.com/go/

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.