Open Source C Chess Engines

CBoard (Curses/Console Board) is an Ncurses frontend to chess engines supporting the XBoard protocol. Supports reading and writing PGN including roster tags, RAV, FEN, NAG and comments, lots of configuration options, UTF-8, different board sizes depending on the terminal and more.

OliveChess is a simple chess engine compatible with modern chess interfaces such as ChessBase products, Arena and XBoard/Winboard. The engine supports UCI and XBoard protocols. Note: in order to use it as an xboard engine you may need Polyglot tool to be installed first

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.

Slibo is a chess interface and a chess engine for KDE.

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

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.

Not so strong UCI chess engine programmed for fun. - IID, negascout, QS, SEE - bitboards, magics - null move pruning - hash (QS too), pawn hash - killers, history - time management, singular reply in root - staged generation - soft control - fast mobility - (undone) learning

XBoard compatible chess engine for Linux

Hanzo the Razor Chess Engine

Manado Chess - XBoard and UCI compatible chess engine

Neophyte is a Winboard and UCI compatible chess engine designed to play with a human style. Strong play comes second to the goal of playing like a human.

SMART: SMART Minimax Analyser for Recursive Trees. The goal of the SMART project is to develop a powerful state-of-the art FICS compliant chess engine, using experimental technology (re-iterative MTDf , ETC, reinforced temporal difference learning, etc.)

Small potato is a IETF protocol version 2 compliant chess engine, to be used with XBoard/WinBoard style interfaces.

icsdrone acts as an interface between an ICS (Internet Chess Server) and a chess engine supporting the XBoard/WinBoard protocol. Unlike XBoard/WinBoard it does not use a graphical interface so it is suitable for use on embedded systems. icsdrone was originally developed for FICS (the Free Internet Chess Server) by Henrik Gram but currently ICC (the Internet Chess Club) works as well. Some features - "Daemon mode" (run in background). - Auto reconnection in case of network problems. - Builtin support for using timeseal. - An ICS proxy. When instructed via the "proxy" option, icsdrone acts as a proxy for the ICS it is connected to. This is similar to using xboard with zippy but now the "GUI" (xboard/winboard) can be closed without terminating the engine.

Small project chess engine/AI written in C designed to work with XBoard. This is a summer project by an undergraduate computer science student, not a work of art. The code is rough and not fully functional.

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.