eval.bar

eval.bar is an open-source chess analysis tool that helps you analyze your games using Stockfish. Pull your games from Chess.com, or upload a PGN; then, use the built-in analysis tool or export your games to Lichess.org.

Current Features

Import Games

• Chess.com (Enter a Chess.com username to pull the user's games)
  • Username stored in local storage and used to pull games on page load
• PGN (paste a game in Portable Game Notation to analyze)

Analyze In-Browser

• In-browser analysis using a WebAssembly port of Stockfish 16
• View best moves/lines and evaluation scores
• Visualize overall position evaluation with an evaluation bar
• Play moves on the board to see how the evaluation changes

Export Games

• Export games to Lichess.org for further analysis
• Download or copy a game as PGN

To-Do

Major Features

• Add a "Game Review" feature that provides a full game analysis, much like the "Game Review" feature on Chess.com
  • A graph of evaluation over the course of the game
  • A "grade" for each move:
    • Blunder
    • Mistake
    • Inaccuracy
    • Good move
    • Excellent move
    • Best move
    • Great move
    • Brilliant move
  • A list of "key moments" in the game
  • Other statistics
• Add an opening explorer
  • Show the most common moves in the current position
  • Show the win/draw/loss percentages for each move
  • Show the ECO information for the current position
• Add a "Game Library" feature that allows users to save games for later analysis
• Complex PGN support (variations)
• Add support for other chess engines
  • Leela Chess Zero
  • Others
  • Maybe even compare the evaluations of multiple engines
• Add support for more variants (low priority)

Minor Features

• Add support for imports from Lichess
• Add support for importing games from PGN files
• Add FEN (Forsyth-Edwards Notation) support

Stack

• Built with React, Vite, and Tailwind CSS
• Hosted using Google Firebase Hosting

Contributing

Please contribute! I'm open to any and all contributions. Feel free to either implement a feature from the to-do list or suggest a new feature. If you find a bug, please open an issue.

Long-Term Vision

I want to make eval.bar an analysis tool comparable to ChessBase, SCID, and other serious analysis tools, but with the following improvements:

• Zero installation required (runs in the browser)
• Beautiful, modern UI (all the other tools look like they're from the 90s)
• Easy to use, beginner-friendly (no need to read a manual to get started)
• Cheaper cloud analysis, and otherwise free (no paywalls)
• Chess engine development support (Provides a UI for engine developers to test their engines)
• Open-source (so that the community can contribute and improve the tool)