Chess Analyzer Pro v2.1.0: Analysis Explorer, Polyglot Books, and Auto-Updates

Version 2.1.0 is out.

This release has been in the works for a while. It adds three major features, fixes a handful of lingering bugs, and restructures the code in ways you won't see but should make future updates faster.

Here's what actually changed.

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Analysis Explorer

The main new feature is the Analysis Explorer . a dedicated view with its own board where you can explore positions independently from the main analysis.

It works like this: from any analyzed game, click "Explore from here." This opens the Explorer tab with the current position loaded. You now have:

• An independent chess board with drag-and-drop piece movement
• Live Stockfish analysis running on the current position
• Opening book suggestions from both the local SQLite database and Polyglot .bin files
• Move classification on explored lines
• Inline SAN text input . type Nf3 and the board responds
• Copy FEN and Copy PGN buttons

The Explorer tab stays open when you switch back to the main analysis. You can use it to test variations without disturbing your primary game review.

Analysis Explorer — independent board with engine lines and book moves

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Polyglot Opening Books

Chess Analyzer Pro now supports Polyglot binary opening books (.bin files). If you have a Polyglot book with your preferred opening repertoire, you can load it in Settings → Book Settings.

The app checks book moves during analysis and marks them appropriately. Book moves are shown with classification icons in the Explorer's move list, and the book section is collapsible.

This is in addition to the existing local SQLite opening database, which is built from the Lichess ECO dataset and works out of the box.

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Cross-Platform Auto-Updates

The app now checks for updates on startup. When a new version is available, it shows a dialog with the changelog.

The update installers are platform-native:

• Windows: Inno Setup installer with silent upgrade
• macOS: DMG that opens in Finder after stripping quarantine attributes
• Linux: AppImage hot-swap. The old file is replaced, and the new one is launched

The update mechanism uses GitHub Releases to check for new versions and download the appropriate asset for your platform.

Auto-update dialog showing changelog and download button

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Other Changes

Accuracy Tuning

The classification algorithm was adjusted to better match expected behavior:

• Blunder/Mistake/Inaccuracy thresholds were tightened
• Blunder now takes priority over Miss in the classification order
• Book move detection has a cooldown to prevent early exits from known lines
• The accuracy decay constant was increased for better Chess.com alignment

Chess960 Fix

Chess960 (Fischer Random) games now work correctly through the entire pipeline. The Chess960 flag persists across game saving, loading, CSV export, and CSV import. Earlier versions could lose this flag during export.

Code Restructuring

The backend and GUI code was reorganized into cleaner directory structures:

• src/backend/analysis/, api/, services/, storage/, updater/
• src/gui/board/, analysis/, components/, dialogs/, views/, metrics/

This doesn't change anything you see, but it makes the codebase easier to maintain and contribute to.

Bug Fixes

• Fixed PGN export in AI summary generation (was missing the starting FEN header)
• Fixed crashes when switching between PGN loading and history views
• Fixed engine analysis freeze when switching between Polyglot and internal books
• Fixed configuration reloading and API profile validation
• Fixed Windows installer build issues

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Upgrading

If you already have Chess Analyzer Pro installed, the app will notify you about the update on startup. Click the notification to download and install.

If you're downloading for the first time, grab the latest release from the downloads page:

• Windows: .exe installer
• macOS: .dmg
• Linux: .AppImage

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Links

• Download v2.1.0: chessanalyzer.xyz/releases
• GitHub Repository: github.com/imutkarsht/Chess_analyzer
• Full Changelog: chessanalyzer.xyz/docs/patch-notes