Open Source Android Chess Engines

Stockfish is a free, powerful UCI chess engine derived from Glaurung 2.1. Stockfish is not a complete chess program and requires a UCI-compatible graphical user interface (GUI) (e.g. XBoard with PolyGlot, Scid, Cute Chess, eboard, Arena, Sigma Chess, Shredder, Chess Partner or Fritz) in order to be used comfortably. Read the documentation for your GUI of choice for information about how to use Stockfish with it. Stockfish is a 11-time winner of the Top Chess Engine Championship. Stockfish is open source (GPLv3 license). That means you can read the code, modify it, and contribute back. You can use Stockfish on your computer or on your iOS or Android device. So you can get world-class chess analysis, wherever you are. The Stockfish engine features two evaluation functions for chess, the classical evaluation based on handcrafted terms, and the NNUE evaluation based on efficiently updatable neural networks.

Installation files for chess engines that provide the Open Exchange (OEX) format (links to the source code of the built-in chess engines can be found in the corresponding zip archives). The APK files "Chess Engines" and "Chess Engines Bonus" contains almost all UCI compliant chess engines that are already published here. The APK file "Chess Engines Bonus" contains chess engines without embedded networks. Chess engines in this package are not ready to use. The missing network files can be found in the assets directory (just rename .apk to .zip). The APK file "XBoard Chess Engines" contains chess engines that support the Chess Engine Communication Protocol (WinBoard and XBoard). Requires a chess app that supports the OEX format (e.g. Chess for Android or DroidFish).

Open source chess engines that support the Universal Chess Interface (UCI) protocol or Chess Engine Communication Protocol (WinBoard and XBoard). They are written in the C, C++, Go and Rust programming language. C and C++ based chess engines were generated with Android NDK, Clang and GCC. Go and Rust based chess engines were generated with their correspondent compilers. This was done on different platforms like Linux, Termux and Windows. Every zip archive contains a readme file with further information (e. g. link to the source code). Chess engines are located in the libs directory and are available for arm64-v8.2a-dotprod, arm64-v8a, armeabi-v7a, x86 and x86_64 based devices. If a chess engine supports NNUE (Neural Network Updated Efficiently) technology and the network is not embedded in the binary, you will find the missing network file in the networks directory. Requires a chess app that has full access to the internal memory (e.g. Chess for Android 6.2.1 or DroidFish).

Open source scripts and tools for Android. Every zip archive contains a readme file with further information (e. g. link to the source code). Chess tools are located in the libs directory and are available for arm64-v8a, armeabi-v7a, x86 and x86_64 based devices. CECSA (Chess Engine Compiler Script for Android) and CETSA (Chess Engine Tournament Script for Android) are scripts for Termux. They need to be extracted in the home directory of Termux. There is also an installation script for CECSA (cecsa.sh) that can be used to install a complete compilation environment with all necessary compilers, tools and libraries under Termux. Note that scripts and tools requires Termux.

Demo version of RelaXChess game, You can play against own written wow chess engine, or other users, rewind games forward and backward, easily restart again or if needed replay the game on demand. Attractive user interface and effects. If You like to You can see other games being played, windows, android