When my "engine-obsessed" teammate -- you know who you are, @Pete -- gave me a heads up that "Danny, you might wanna check out this game!", I reacted as I normally do: "Pete, these are computers here! I'm watching the Sinquefield Cup!"

I hope you enjoy my breakdown of this legendary performance by the machine-learning engine Lc0, nicknamed "Leela." The game was taken from preliminary testing for an upcoming Chess.com computer chess championship event (more on that next week!).


Chiron 5 Chess Engine Download


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I analyzed the game deeply (well, took a few hours between yesterday and today) to give my thoughts, and provide some (potentially?) instructive takeaways from the queen of computer chess herself: the legendary Leela!

Chiron,

a commercial chess engine by Ubaldo Andrea Farina, supporting both the Chess Engine Communication Protocol and UCI, the PolyGlot and CTG [2] opening book formats, various endgame tablebase and bitbase formats, and able to play Chess960. The development started in 2002 and it has been under continuous development, underwent a major rewrite in 2009 using bitboards, and has been commercially released in October 2011 [3] . Chiron applies parallel search on multiprocessor systems, and has implemented pawn blockage detection function [4] [5], improved to detect blockages not only in pawn endgame but also when there are a few pieces on the board [6] [7] [8]. Chiron is available as Windows and Android version.

Even so, the computer v. computer game being played at the Chess.com HQ in California on August 23 was different. Leela Chess Zero, an open-source chess engine, appeared to be mocking its opponent, the Chiron Chess Engine, after securing an unassailable lead. Leela uses deep reinforcement learning to play and become better at the game, and this technology is much better than the one powering Chiron, a brute-force algorithm.


Chess engines are computer programs that analyzes chess positions and makes decisions on the best chess moves. Chess engines are good for analyzing games and using it as a playing partner. Chess engines support one or both major protocols called Chess Engine Communication Protocol, such as WinBoard (Windows)/XBoard (Unix), or Universal Chess Interface (UCI). Chess engines increase in playing strength each year due to the increase in processing power that enables calculations to be made to greater depths or ply in a given time. Some chess engines use endgame tablebases to increase their playing strength during the endgame.

The first record of the chess engine was around 1994. The Chess Engine Communication Protocol was designed by Tim Mann, author of XBoard. It was initially intended to communicate with the GNU Chess engine, which only accepted text input and produced text output.

Chiron is a chess engine with support of both UCI and Winboard 2 protocols. It was written by Ubaldo Andrea Farina. Development of Chiron started in 2002. In 2009 and 2010, it won the Italian championship for computers. The engine was commercially released in October, 2011. It uses the Polyglot and CTG opening book formats and various endgame tablebase and bitbase formats. Chiron 2 was released in December 2013.

Comstock is a strong UCI chess engine developed from the IPPOLIT project. It is a combined compilation from the base source code of Stockfish 3 and the Ippolit Robbobases. The latest version is Comstock 3.

Crafty is a free, open-source computer chess program developed by Dr. Robert Hyatt. The latest version is 23.4. It is directly derived from Cray Blitz, which won the 1983 and 1986 World Computer Chess Championships. Crafty uses the Chess Engine Communication Protocol and can run under the popular chess interfaces such as Winboard, XBoard, and Arena. It is about 2800 in strength.

Critter is a cross-platform UCI chess engine written by Richard Vida of Slovakia. The engine is free for non-commercial use. The engine, written in C++, has been one of the top five engines on most official chess engine rating lists. It most recent release is version 1.6a 64-bit, dated June 2012.

Cyclone is a very strong open-source UCI chess engine based on Fruit and Toga. It uses principle variation search, iterative deepening, transposition tables, and null-move pruning. It is rated around 2900.

Firebird is one of the strongest open-source, free, multiprocessor engines. The anonymous Russian programmers (calling themselves Decemrists) have published the code as open-source. Firebird was first released in October 2009 with its source code.

Fritz is a German chess program developed by Gyula Horvath and published by ChessBase. The latest commercial version id Deep Fritz 14. This version supports 64-bit hardware and 8-core multiprocessing by default. In 1995, Fritz 3 won the World Computer Chess Championships in Hong Kong. In 2002, Deep Fritz drew a match with world champion Vladimir Kramnik. In 2003, X3D Fritz drew a four-game match against Garry Kasparov. In 2013, Deep Fritz 14 switched engines from the original author Frans Morsch to Gyula Horvath, author of Pandix.

Fruit is a chess engine developed by Fabien Letouzey. It is freeware. In 2005, Fruit was vice world computer chess champion, finishing second behind Zappa. The latest version is Fruit 2.3.1 from Ryan Benitez. Fruit 2.3.1 was one of the top 3 free UCI chess engines.

Glaurung is an UCI-compatible open source chess engine developed by Tord Romstad under the General Public License (GPL) 3 license. It is the forerunner of Stockfish. It was first released in 2004. In February 2014, a modified and tuned version of Glauring became the chess engine of Play Magnus.

GreKo is a Chess Engine Communication Protocol compliant open source engine written by Vladimir Medvedev. It is written in C++. Development began in 2002. In April 2011, GreKo was ported to the Android by Aart Bik using the GUI of his Chess for Android application.

HIARCS is the reigning World Chess Software Champion. It is a propriety UCI chess engine developed by Mark Uniacke. Its name is an acronym standing for Higher Intelligence Auto-Response Chess System. It was first released in 1980. The latest is version 14, released in August 2012. It has its own GUI (Chess Explorer).

Houdini 4 chess engine currently leads all the major computer chess rating lists. It is a UCI chess engine developed by Belgian programmer Robert Houdart. It was first released in May, 2010. The current version was released in November 2013. Houdart was a structural engineer working on nuclear power plants who created a chess program in his spare time.

IPPOLIT is an open-source chess program. The program is a console application that communicates with a chess GUI via UCI protocol. IPPOLIT is a bitboard chess engine optimized for 64-bit architecture. It was first released in May 2009.

Junior (Deep Junior) is a computer chess program written by Amir Ban and Shay Bushinsky of Israel. Junior won the World Computer Chess Championship in 2002, 2004, 2006, 2009, 2011, and 2013. It is considered the most successful program ever.

Komodo is a UCI chess engine that won the 2012 CCT and the 2013 TCEC tournament. The engine was developed by Don Dailey (1956-2013), Mark Lefler, and supported by grandmaster Larry Kaufman. The engine was initially released in January 2010. The latest version is Komodo 6, which is the first version to use multiple processors.

Naum is a chess engine by Aleksandar Naumov of Canada. The program supports both UCI and Winboard protocols. It was first released in April 2004. The final release was version 4.2 in March 2010. Development of Naum was discontinued in 2012. In 2008, it tied for 1st place in the Internet Computer Chess Tournament.

Rybka is one of the strongest UCI chess engines in the world, programmed by International Master Vasik Rajlich. It won four consecutive World Computer Chess Championships from 2007 to 2010, but was stripped of these titles after a games association panel concluded that Rybka plagiarized code from both Crafty and Fruit. The finding has been disputed. The latest version is Deep Rybka 4.1.

Shredder is a commercial chess program by Stefan Meyer-Kahlen. It was first developed in 1993. Since 1996, it has won 17 titles as World Computer Chess Champion. In 2013, it won the world computer chess blitz championship.

Spike is a chess engine that uses the Winboard or UCI protocols. Spike is the first computer chess world champion in Chess960 (Fischer Random Chess). Spike was written by Ralf Schafer and Volker Bohm.

Stockfish is an open source (GPL license) UCI chess engine, developed by Tord Romstad, Marco Costalba and Joona Kiiski. It is derived from Glauring, and open source engine by Romstad. Stockfish is an alpha-beta searcher and uses a bitboard representation. Stockfish is in the top three in all major computer chess rankings.

Strelka is a computer chess engine for Windows, developed by Yuri Osipov. The current version is 5.5, released in May 2012, and one of the strongest programs in the world. Strelka first appeared in May 2007.

Toga (Toga II) is a chess engine by Thomas Gaksch and Fabien Letouzey. The engine derived from Fruit 2.0/2.1. Toga first appeared in early 2005. It is one of the strongest open-source engines. Version Toga II 3.0 is maintained by Jerry Donald, released in May, 2013.

Zappa is a UCI chess engine written by Anthony Cozzie and Zach Wegner. It was first released in February 2005. In 2005, it won the world computer chess championships, beating both Junior and Shredder. In 2006, a commercial version dubbed Zap!Chess running under the Frits GUI was released by ChessBase. In 2010, an improved Zappa engine was completed under the name Rondo. A version of Zappa called Zappa Mexico is sold by Shredder Computer chess. It is compatible with Windows and Linux computers and supports the Nalimov endgame tablebases.

The first stage will reduce the 24 engines to 8, which willthen play a quadruple round-robin at a longer time control of 90 minutes + 10seconds per move to determine the two finalists. They then play a 100-gamematch, with the time control extended to 120 minutes + 15 seconds per move. e24fc04721

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