Open Source C Chess Games for Mac

"Shane's Chess Information Database" is a huge chess toolkit with extensive database, analysis and chess-playing features. Scid vs. PC is a usability and bug-fix fork of Scid. It has many interface fixes and improvements, and is fully compatible with Scid's .si4 databases. New features include a rewritten Gamelist, Computer Tournament, and FICS, Tree, Book and Graph improvements.

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/...

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

Popeye is a chess problem solving and testing software with strong support for fairy chess and heterodox genres. For more information cf. topic "Popeye (chess)" on http://en.wikipedia.org/

SAN Kit was made public in 1993 by Stephen Edwards, the inventor of PGN Chess notation. The original code is in C, and with few comments quite cryptic. In addition, the original author's style was quite quixotic, making it even more difficult to read. This code is now reformatted to modern standards, adds support for NAG codes and comments, and has a "non-CLI" mode for inclusion in chess playing programs. The code has gone through extensive analysis using the llvm/clang compiler and reports no issues at this time. To use the code as a "framework" you would undefined "CLI". In addition, a small C++ program is included that takes as input a file of one or more PGN records, and outputs pure pristine PGN records as output. In addition to flagging errors at the move level, the program provides three boards around the move. NOTE: plan on budgeting a fair amount of time to read, re-read, and experiment with the documentation and cryptic uncommented code. You are on your own

An open source chess engine in C, released under the GPL. Compatible with the XBoard and UCI interface protocols to link to a GUI or other chess arbiter.

Sour*eforge.net has become inaccesible to me because of Cl*udflare. The latest versions of the programs will be on my site: https://matei.one/. Simple chess game for people who want to play chess but don't want to take it seriously. Written in C, using SDL 1.2 or SDL 2 for graphics. Interface inspired from old chess game for ZX Spectrum. The computer searches (L+2)/2 moves ahead (assuming that a move means that both sides move a piece), where L is the difficulty level. Positions are evaluated only by adding the values of the pieces left on the board. Any factors related to where the pieces are, such as mobility, doubled pawns, isolated pawns etc. are not considered. To add variety to the game, possible moves are randomly shuffled before every search.

IMPORTANT: I renamed the project to cengix (chess engine no. x). See http://code.google.com/p/cengix. IMPORTANT: yacen is not in any way related to the YACE chess engine. The similar name was a mistake. To avoid confusion, I will rename my project soon and provide a link to the new site then. yacen is a simple chess engine with main focus on understandability of code and mechanisms rather than on pure performance. It is completely written in ANSI-C using nothing more than the standard library and thus is very portable and easy to compile on almost every platform. yacen uses the common UCI interface to communicate with any compatible GUI. NOTE: yacen is currently in pre-alpha status. This means that there is only source code available which is far from complete and thus cannot be compiled to a working binary yet. A more complete source code and first binaries for Linux and Windows will be available when the project reaches alpha status.

Faile is a free chess program which plays a fairly strong game of chess (Expert strength or better). One of the main goals of Faile is to provide a full featured chess program with source code which is tidy, well documented, and easy to understand.

Trinkets for hackers. Currently: Rubik cube move series inventor. Go solver for tiny boards. Jokes converted into lateral puzzles. Turing machine enumeration Things coming: sci-fi ideas/stories, chess (endgame), etc... License GPL+GFDL

Cross-Platform 3D Chess A 3D chess game made using OpenGL and C++ Objectives: -High Quality Graphics -Proper Chess Rules -Availability of Unofficial Chess Rules -Reading Generic Chess Files -Proper A.I. for user vs. computer modes -Good GUI -Network Current Status: Chess rules exist

GamesCrafters is an undergraduate research group at the University of California, Berkeley. GAMESMAN is our software for building text & X11 apps for finite, 2-person abstract perfect-information games (e.g., TicTacToe & chess). We've authored 40+ games

Gcboard is a widget for Chess-style games (i.e. Checkers). It provides an easy to use API for creating a nice looking chessboard, which supports several playing styles (clicking, dragging, flashing pieces, etc).

Kingdom Wars is a client/server chess daemon designed to run on multiple operating platforms. Both the client and the server are stand alone. The network protocal is open, and custom clients are welcome to be developed.

Sjeng is a strong, GPL'ed chessprogram that plays bughouse and crazyhouse (drop-chess). It also supports standard chess and is compatible with any program supporting the XBoard/WinBoard protocol.

Witz is a chess program that is designed to work with a Winboard interface.

YICS connects to the Yahoo! Chess server and emulates a chessd-based server, making it possible to use ICS-compatible interfaces (such as xboard, WinBoard, eboard, and Thief) on Yahoo! Chess.

ChessXtra is a script xtra for Macromedia Director that uses GnuChess as a library to play chess. We (www.theblip.com) used it previously to power our chess-playing bot, and figured the community at large could use/improve on what we've got.