Depending on what you are looking for, you are likely referring to one of two popular chess tools: PGN Chess Book (the Windows database software) or Chessbook (the modern web app for opening repertoires). Option 1: PGN Chess Book (Windows Software)
PGN Chess Book is a free, lightweight database and game viewer application available on the Microsoft Store for Windows 10 and higher. It is designed for players who download .pgn files (Portable Game Notation) from the web and need a local platform to view, edit, and analyze them.
Blunder Analysis: It integrates the open-source Stockfish chess engine to automatically scan your games and isolate your tactical mistakes.
Database Management: You can create your own custom databases, add personal annotations, and build multi-level nested variations to explore alternate paths.
Advanced Filters: The app lets you filter and search your game list by specific board positions (e.g., finding all Sicilian Defense games), player names, event dates, results, or Elo ratings.
Printing Capabilities: Unlike many web tools, it provides wide print layout support so you can print out your physical games complete with chess diagrams. Option 2: Chessbook (Modern Web Application)
If you are looking for a web platform to build your openings, you are likely thinking of Chessbook.com, a popular, streamlined web app designed by a former Apple engineer specifically to help players build a bulletproof opening repertoire.
Targeted Learning: Instead of memorizing deep, obscure Grandmaster lines, Chessbook uses online game statistics (sourced from platforms like Lichess) to show you the moves that actually happen most often at your specific rating level.
Spaced Repetition: It acts like flashcards for your openings, prompting you with custom-tailored practice sessions to drill the exact lines you keep forgetting.
Repertoire Consolidation: It allows you to merge multiple distinct opening lines—whether they are from a YouTube video, a personal coach, or a .pgn export—into one unified master repertoire.
Coverage Tracking: The system calculates a personal “coverage percentage” per opening, visually highlighting the exact gaps in your preparation before opponents can catch you off guard. If you want to dive deeper into one of these, let me know: What operating system or device do you plan on using?
What specific chess goals are you trying to accomplish right now? PGN Chess Book – Download and install on Windows
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