Open Source Mac 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.

Chess engine code name "Gull"

jose is a graphical Chess tool. 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.

latest portable distribution: https://sourceforge.net/projects/craftychessinterface/files/crafty_gui_10.7z/download

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!)

yet another UCI chess engine

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 the engine (with gambit book) play against another engine (either clublevel or 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.

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.

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.

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.

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.

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)

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

Open source scripts and tools for Windows. Every zip archive contains a readme file with further information. PGNBook and PGNStat 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.

An interface for javascript chess engines to the UCI (universal chess interface) protocol. This allows javascript chess engines to be launched in most chess guis. The progam is based on the Google V8 Javascript Engine. This program expects the path to the .js file of the engine in the first parameter. A wrapper for the open source Javascript Engine p4wn by Douglas Bagnall is provided as an example. A successful and very complete implementation is the Javascript Chess Engine Lozza by Colin Jenkins. The webpage also includes a simple step-by-step guide setting up jsuci with Lozza. http://op12no2.me/toys/lozza/ You may also want to try connecting this javascript translation of the chess engine Stockfish 5 to jsuci: https://github.com/exoticorn/stockfish-js

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

This is UCI Chess Engine writen in Java. Since version 1.4 (inclusive) the project was moved to https://github.com/bagaturchess/Bagatur

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.

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

Tyrannus is not yet completely finished! I will continue to release updates as I make major strides towards completing the program. For updates on my progress, please visit my YouTube channel at: http://www.youtube.com/user/kolemannixtv Tyrannus vs. Tyrannus Demo: http://www.youtube.com/watch?v=JnZapogi5no Please Note: As of January 28, 2012, and the release of version 2.0, I, Koleman Nix, am still the sole programmer of Tyrannus. If anyone would like to work on this project with me, just send me a message and we can see about that. Latest Update: The Engine beats me easily now, and I have pre-programmed 4 different difficulties into the release of version 2.0. The idea is that 1.0 was a chess app, and 2.0 is a chess engine. Hope you enjoy playing against the engine! Good luck.

AmySharp is the C# version (stripped down) of the Amy Chess Engine hosted at https://sourceforge.net/projects/amy2/ originally developed by Thorsten Greiner.

MinkoChess is a multiplatform chess engine written in C++.

Carballo is an Open Source Chess Engine developed in Java with simplicity and clearity of code in mind. It is based on BitBoards, with a magic Bitboard move generator and scores aprox 2300 ELO points in BT2630 test.

Cassandre is an extensible chess engine written in C++, it is Winboard/XBoard compliant.