Open Source C++ Chess Games

Scid is a chess database application (cross-platform, for Unix/Linux and Windows) with many search and database maintenance features.

A free and open source chess database application for Linux, Mac OS X and Windows.

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.

Eagle Mode is a zoomable user interface (ZUI) with file manager, file viewers, games, and more. This project is about a futuristic style of human-computer interaction, where the user can visit almost everything simply by zooming in. It features a portable C++ toolkit API for developing such ZUIs, and it features the Eagle Mode application, which provides a virtual cosmos with plugin applications. The most important one is the professional file manager with its rich, scriptable command set. It integrates file viewers for most of the common file types, as well as an audio and video player. Furthermore, the virtual cosmos contains a chess game, a netwalk game, a 3D minesweeper game, a multi-function clock, a stock watchlist, some fractals, and a Linux kernel configurator in form of a kernel patch.

Brutal Chess features full 3D graphics, an advanced particle engine, and several different levels of intelligent AI, inspired by the once popular "Battle Chess" released by Interplay circa 1988.

XiangQi Wizard (Chinese Chess Wizard) is a powerful XiangQi (chinese chess) program, which supports UCCI engines. XQWizard Light is the Mobile version for Windows CE and Java ME. ElephantEye is the UCCI engine in XQWizard with strong AI.

Scidb is an open-source chess database application for Windows, Unix/Linux. It is a new development inspired by Scid.

ChessDB is a free open-source chess database for Windows, Linux, Mac OSX and most UNIX and UNIX-like operating systems. ChessDB is based on code from Scid http://scid.sourceforge.net/ - a project for which there have been no updates for several years. In

Chess engine code name "Gull"

Thief is a free chess client to play on chess servers like FICS: http://www.freechess.org It supports regular chess and all variants played. It is the best client for playing Bughouse, a special team-chess game (for more info see http://www.bughouse.

Virtual Chess Clock is a chess clock software: it can be used to simulate a chess clock on computer (typically a laptop). Virtual Chess Clock is designed to be easy to use. It is free, open-source and multi-platform.

This project is a POSIX-compliant driver for the dgt board from dgtprojects. It is intented at acting as a layer between chess engines and the dgt board.

The Nimzo_3d GUI is a chess program for Windows 7 - 11 It is an enhanced version of the Tarrasch Chess GUI written by Mr Bill Forster, with many additional features. It has a simple, easy to use interface, so it is ideal for novice players or inexperienced computer users. It also has more advanced features for expert users. So if you just want a casual blitz game against the computer, or to automatically analyse one of the famous games from chess history, it can perform these tasks and many more. It has a choice of a classical 2d screen view or realistic 3d graphics powered by DirectX Anyone who wants to add new features to the program should download the file < Nimzo_3d_v4_build.7z> from the < Files > < Build> section. This package contains Visual Studio project files and C++ source code files. Alternative Nimzo 3d Chess GUI website with other downloads, including 32-bit versions - https://nimzo-3d-chess-gui.infinityfreeapp.com

EBoard is a user-friendly chess interface for ICS (Internet Chess Servers). While it will focus on FICS (www.freechess.org), should work with any other ICS. It supports playing against local chess engines too.

Redqueen is an UCI (Universal Chess Interface) only compatible chess engine written in C++.

Gambit is a cross-platform chess game. There are binaries for Windows users. Users of Unix-like operating systems can check the web site for build instructions (it should be easy to follow).

A console/text based chess program with XBoard/CECP and UCI API, available on all major platforms. You may need a graphical chess interface to use it. Please refer to README.md in the files section for installation instructions. The last stable release is 2.1.9 and has been released on 19/08/2025. Belofte 0.2.0 till 0.9.20 (c/c++): Xboard 1 & 2 (CECP) - Linux/Unix/(Windows) Belofte 2.1.1 and up (c++11) : UCI and Xboard 2 - Linux/Windows/Mac/Android/... For access to code, please clone the git repository. Compiles and Runs on 32/64 bit on Windows, Mac, Linux, Android (ARM/x86) and Raspberry. Released under GNU v2 license. (means free to copy, free to modify, free to use, ...) Works fine with Arena/Cutechess/BanksiaGui/Winboard/Xboard/...

A 3D and portable chess game with an embedded Artificial Intelligence and some pretty good graphics.

A Bughouse/w24 and Crazyhouse/w23 playing program. C++ , Linux/Windows, GPL. Also available in precompiled packages to start playing right away.

Chess Wizard is a powerful chess software to play, study, edit and publish games. It supports many strong UCI engines, provides a huge online database and hundreds of puzzles. Chess960 is available now.

A chess database management system for Linux, Windows and MacOs X.

PGN reader is a Open Source Chess game interface with emphasis on the study of Chess theory and support for traditional Chess notation forms ( FEN, PGN, Agebraic Notation )and modern non proprietary output formats ( XHTML, XML ). It has been tested on Linux and relies on Qt 4.0 and is being developed with the KDevelop IDE in C++. PGN Reader was born out of a general dissatisfaction with available Chess interfaces and as such presents a unique feature set which emphsizes the study of Chess and traditional Chess notation forms as well as embracing the Open Source philosophy non proprietary culture of the Chess community. Some of the notable features are. Forsythe Edwards Notation. PGN Files read and write. Unadorned Chess Diagrams. Unlimited Simultaneous Diagrams. Diagram Cloning. Graphical Diagramming. XML output for Chess Authoring. PGN processing sub processes. Open Source Chess Engine interfacing.

CINAG is an UCI computer chess engine. This is a module which thinks about the game and try to find the best move for each position. Our goal is to create a quite strong opponent by using state of the art AI technics.

This project aims to provide a fast chess bot able to recognize moves and respond to them via use of an external UCI-engine, such as - preferrably - Rybka 2.9. Check out a live demo here: https://vimeo.com/128428976

A powerful chess engine written in C++. It currently implements hybrid board representation, alphabeta pruning, quiescence search, static evaluation, legal move generator, iterative deepening, MVV/LVA move reordering, makemove, unmakemove and uci move representation standard, tapered evaluation. Elostat gives the current version an ELO of 2100 measured over 50 games.