[Stockfish](https://stockfishchess.org/) is a **free, open source, and strong UCI chess engine** derived from Glaurung 2.1 that analyzes chess positions and computes the optimal moves.

Stockfish **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](Download-and-usage#free) are developed independently from Stockfish and are available online. 
**Read the documentation for your GUI** of choice for information about how to use Stockfish with it.

* [Download and install Stockfish](Download-and-usage#download-stockfish) using the official builds

* Developers can [build Stockfish](Compiling-from-source) from source
  * [Linux](Compiling-from-source#linux)
  * [Windows](Compiling-from-source#windows)
  * [macOS](Compiling-from-source#macos)

# Support

If you're looking for any kind of assistance with Stockfish.

* [Discord](https://discord.gg/GWDRS3kU6R)
* [Github discussions](https://github.com/official-stockfish/Stockfish/discussions/categories/q-a)

# Guides

* General
  * [FAQ](Stockfish-FAQ)
  * [Download Stockfish](Download-and-usage#download-stockfish)
  * [Download GUI](Download-and-usage#download-a-chess-gui)
  * [Install in GUI](Download-and-usage#install-in-a-chess-gui)

* [Developers](Developers)
  * [Using Stockfish in your project](Developers#using-stockfish-in-your-own-project)
  * [Contributing](Developers#participating-in-the-project)
  * [Copying](https://github.com/official-stockfish/Stockfish/blob/master/Copying.txt)

# Related repositories

* Trainer: [glinscott/nnue-pytorch](https://github.com/glinscott/nnue-pytorch)
* Fishtest: [glinscott/fishtest](https://github.com/glinscott/fishtest)
* Fishtest worker setup: [ppigazzini/worker-setup](https://github.com/ppigazzini/worker-setup)
* Website: [daylen/stockfish-web](https://github.com/daylen/stockfish-web)
* Mac app: [daylen/stockfish-mac](https://github.com/daylen/stockfish-mac)
* Matetrack: [vondele/matetrack](https://github.com/vondele/matetrack)
* WDL model: [vondele/WLD_model](https://github.com/vondele/WLD_model)

See also our overview of [Governance and Responsibilities](Governance-and-responsibilities).