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[DON] is a free, open source, and strong UCI chess engine derived from Glaurung 2.1 that analyzes chess positions and computes the optimal moves.

DON does not include a graphical user interface (GUI) that is required to display a chessboard and to make it easy to input moves. Several Free GUIs are developed independently from Stockfish and are available online. Read the documentation for your GUI of choice for information about how to use DON with it.

Guides

• For users

  • Download DON
  • Download GUI
  • Install in GUI
  • Commands and options
  • Frequently asked questions (FAQ)

• For Developers

  • Compiling from sources
  • Using DON in your project
  • Contributing
  • Copying

Support

If you need help with DON, have questions, or encounter a bug, please use the GitHub issue tracker.

You can report:

• Bugs or crashes
• Build or platform-specific issues
• Performance or engine behavior problems
• Feature requests and suggestions

👉 Report issues here:

• GitHub Issues