Open Source Chess Engines
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Chess Engines
View 15189 business solutionsBrowse free open source Chess Engines and projects for Windows and Mac below. Use the toggles on the left to filter open source Chess Engines by OS, license, language, programming language, and project status.
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Stockfish
UCI chess engine
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. -
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jose is a graphical Chess tool. >>> moved to https://peteschaefer.github.io/jose <<< You can store chess games in a database. You can view and edit games (including variations and comments). You can play against a plugged-in chess engine and use it for analysis. Features 3D board view.
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Crafty Chess Interface
free open-source chess engine interface
latest portable distribution: https://sourceforge.net/projects/craftychessinterface/files/crafty_gui_10.7z/download -
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NetChess
NetChess to play between two players over net or internet
NetChess is a Graphical User Interface (GUI) for playing chess game. This software can be used To play chess between two players over network using TCP/IP (LAN) or in internet/intranet (Network vs Network) To send instant message (chat) while playing chess To observe the chess game played between two players over network To play chess between two players on the same board As PGN, FEN, EPD converter. This can be used To convert PGN to FEN or EPD format To convert FEG to PGN or EPD format To convert EPD to PGN or FEN format As PGN, FEN or EPD gave viewer. Load multiple games. This can also be used to load the games and analyze using chess engines To play chess using chess engines (Supports engines with WinBoard 1, 2 and UCI 1, 2 protocols) Human vs Chess Engine with White side Human vs Chess Engine with Black side Chess Engine with White side vs Chess Engine with Black side on the same board Chess Engine with White side vs Chess Engine -
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Mediocre is a Java-based chess engine, implementing features like LMR, SEE, history and killer moves heuristics, transposition tables, internal iterative deepening, PVS search etc.
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DreamChess
OpenGL chess game
A portable chess game consisting of an xboard-compatible OpenGL user interface with 2D and 3D board views and a chess engine. The primary targets are Windows, Mac OS X and Linux. -
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Chess-gambiteer
Chess training program playing gambits
Program to train against gambit play (*) with the computer, with a strength adjustable chess engine (Danasah, currently set at approx 1400 EL0 when playing against it). Also included now are two options to watch an engine e.g. the 'aggressive' Patricia5 (with gambits) play against another engine (eg IM level). The engine gambit books are made in such a way that 1) real lousy gambits are not played, and 2) the book is choosing a gambit line as often as possible, so for Black it might go for e.g. a Benko gambit or so and if you let it play with White, a lot of 1.e4 gambits can be played. Thereby, if you try a gambit yourself, the program might try to a counter-gambit (or sometimes an unconventional line). It will play weak against other engines, and it not meant as to play very strong/perfectly, but for human opponents, the gambit lines will most often result in entertaining -not boring- games, and require quite some concentration to avoid tactical mistakes. -
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Phalanx is a chess engine which understands the xboard protocol. It's suitable for beginner and intermediate players (I'm counting on your help to make it suitable for strong players!)
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Chess Editor is a pure Java tool to create, edit and view chess games in the Portable Game Notation (PGN) format. The tool integrates with externally specified chess engine programs to provide analysis of board positions.
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Super Micro Chess
The world's smallest chess playing program just got smaller!
Super Micro chess engines are a series of world record small source and executables programs able to play the famous "King's Game" (both with simplified and full FIDE support)! Please refer to the official home page for more details: http://smmax.sf.net. -
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Fen2Pdf
Tool for chess teachers to create PDF files with chess diagrams in it
Tool for chess teachers to create PDF files with chess diagrams in it. 1) Create a pgn file with chess diagrams (FEN notation) in it (e.g by using lichess) 2) Open the Fen2Pdf and select the folder containing the pgn(s) 3) Click start. Fen2Pdf detects the pgn files in it and creates a pdf file You can now print this file and hand the exercises over to your students Extra features: * Mirror the positions. This is handy if you want the same problems presented for the other color for educational purposes. You could present the same set of exercises in 2 different ways! * You can toggle the display of page numbers * The selected pgn folder is saved for next time * The title on the pages is the name of the pgn (without .pgn) -
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GreKo
Chess engine
Winboard/UCI chess engine -
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pythchess
Python chess engine
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BagaturChess
Java Chess Engine
This is UCI Chess Engine writen in Java. Since version 1.4 (inclusive) the project was moved to https://github.com/bagaturchess/Bagatur -
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Provides interface for working with chess games in PGN (use libpgn) make moves, and get result
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Frittle is an open source amateur Java Chess Engine that supports the XBoard/WinBoard Chess Engine Communication Protocol (version 2).
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Redqueen is an UCI (Universal Chess Interface) only compatible chess engine written in C++.
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Chess Tools for Windows
Batch tools for creating Polyglot books and PGN-based statistics.
Open source scripts and tools for Windows. Every zip archive contains a readme file with further information. PGNStat and PGNXtract are batch processing tools for Windows. Simply unpack the zip archive into a directory of your choice. The batch files require free and open source third-party tools. These are not included in the zip archives and must be downloaded separately. An alternative download link, where all third-party tools are already integrated, can be found in the readme files. -
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ChessNovice
A weak open source java chess engine
Another open source java chess engine. The project is in a very early stage. Winboard compliance is partial. Does not support undo of moves or time controls. Right now it makes a move every 45 seconds. If you are a beginner-intermediate player you might find this a good sparring partner.I have tested this only with Arena3.0. I plan to make this stronger gradually. In the the end an array of ChessNovices with varying playing strenths should be available. -
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Chesser
A Chess Engine derived from Winglet
Chesser is a Bitboard chess engine based on Stef Luijten's Winglet Chess Engine. This program came into existence because I saw a huge room for improvement in Winglet. -
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Conqueror Chess Engine
A powerful chess engine written in C++
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. -
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A Java Chess Engine supporting XBoard and OCI protocols. It is implemented using algorithms such as MinMax and AlphaBeta-Pruning searches.