Top 10 strongest chess engines – Chesstutor | Learn how to …

10.Deep Blue (rating: unknown)

Deep Blue, computer chess-playing system designed by IBM in the early 1990s. As the successor to Chiptest and Deep Thought, earlier purpose-built chess computers, Deep Blue was designed to succeed where all others had failed. In 1996 it made history by defeating Russian Grandmaster Garry Kasparov in one of their six gamesthe first time a computer had won a game against a world champion under tournament conditions. In the 1997 rematch, it won the deciding sixth game in only 19 moves; its 3.52.5 victory (it won two games and had three draws) marked the first time a current world champion had lost a match to a computer under tournament conditions. In its final configuration, the IBM RS6000/SP computer used 256 processors working in tandem, with an ability to evaluate 200 million chess positions per second.

9.Chessmaster (rating:~2700)

Chessmaster, popular series of electronic games for playing chess against a computer; it was originally released in 1986 by the Software Toolworks, which was acquired by the Learning Company. Chessmaster featured extremely competitive artificial intelligence engineswith later versions named the Kingthat challenged all but the most skilled of players and helped bring the game to virtually every make of computer and gaming system over the years. Featuring 2-D and 3-D game play, later versions applied technology from other popular chess games to make Chessmaster a universal favourite. Early versions of Chessmaster were released for nearly every type of personal computer, including Amiga, Apple II, Atari 8-bit, Atari ST, ZX Spectrum, Commodore 64, Macintosh, and DOS-based machines. Chessmaster 4000 saw the first incarnation of the King, which allowed players to create chess personalities. These personalities, which a player would assign to his opponent, could be adjusted down to the smallest detail. By placing certain emphasis on a particular aspect of the game, such as king protection or aggressiveness, players were able to compete in a variety of game types and improve their own personal chess abilities. Personalities could be adjusted to mirror actual players, such as the former world chess champions Bobby Fischer or Mikhail Botvinnik.

8.Junior (rating:~3000)

Junior is a computer chess program written by the Israeli programmers Amir Ban and Shay Bushinsky. Grandmaster Boris Alterman assisted, in particular with the opening book. Junior can take advantage of multiple processors, taking the name Deep Junior when competing this way in tournaments.In 2003 Deep Junior played a six-game match against Garry Kasparov, which resulted in a 33 tie. It won a 2006 rapid game against Teimour Radjabov. In June 2007, Deep Junior won the ultimate computer chess challenge organized by FIDE, defeating Deep Fritz 42. These programs opted out of the World Computer Chess Championship, which was held at the same time and won by Rybka with a score of 10/11. Junior won the World Microcomputer Chess Championship in 1997 and 2001 and the World Computer Chess Championship in 2002, 2004, 2006, 2009, 2011 and 2013; both organized by the International Computer Games Association. The name Junior is perhaps deceptive. Playing against Junior is not necessarily something for children, as Garry Kasparov discovered in a match in New York. He was held to a 3-3 draw by the Israeli program. Junior played in its typically dynamic style, greatly surprising the former World Champion with now-famous bishop sacrifice on h2 that forced him to concede a draw. You can look forward to a world class grandmaster when you install the new program on your computer.

7.Hiarcs (rating:~3060)

Multiple World Championship winning computer chess engine, a 3 time World Chess Software Champion and the chess program generally used by former World Chess Champion Vishy Anand. HIARCS is renowned for its high quality, human like chess play, realistic weaker levels and unprecedented chess performances from handheld devices to multi-core desktop computers.

6.Rybka ( rating: ~3150)

Rybka is a computer chess engine designed by International Master Vasik Rajlich. Around 2011 Rybka was one of the top-rated engines on chess engine rating lists and has won many computer chess tournaments. After Rybka won four consecutive World Computer Chess Championships from 2007 to 2010, it was stripped of these titles after the International Computer Games Association concluded in June 2011 that Rybka was plagiarized from both the Crafty and the Fruit chess engines and so failed to meet their originality requirements. The ICGA proceedings against Rybka were subsequently upheld by the FIDE Ethics Commission, saying the ICGA has not violated the FIDE Code of Ethics, nor any other FIDE rule or general principle of law. However, the same FIDE Ethics Commission ruled that banning Rajlich for life failed to have a clear statutory basis and sufficient procedural guarantees, and so they sanctioned ICGA with a warning. Rajlich has now agreed to underpin the Fritz brand of ChessBase, merging Rybka to produce Fritz 15 released in late 2015.

5.Fritz (rating: ~3180)

Fritz is a German chess program developed by Vasik Rajlich and published by ChessBase. The latest version of the consumer product is Fritz 15, now based on Rybka. This version now supports 64-bit hardware and multiprocessing by default.

4.Shredder (rating:~3290)

Shredder is a commercial chess program and chess engine developed in Germany by Stefan Meyer-Kahlen in 1993. Shredder won the World Microcomputer Chess Championship in 1996 and 2000, the World Computer Chess Championship in 1999 and 2003, the World Computer Speed Chess Championship in 2002, 2003, 2004, 2005, and 2007, and the World Chess Software Championship in 2010.

3.Komodo (rating:~ 3380)

Komodo is a UCI chess engine developed by Don Dailey, Mark Lefler, and supported by chess author and evaluation expert, GM Larry Kaufman. Komodo is a commercial chess engine but older versions (8 and older) are free for non-commercial use. It is consistently ranked near the top of most major chess engine rating lists, along with Stockfish and Houdini.Komodo heavily relies on evaluation rather than depth, and thus has a distinctive positional style. Its forte is to play when there is nothing to play. Komodo author Don Dailey described it as such: In positions that most engines would likely struggle or find it impossible to make progress, Komodo quietly prepares a break and ends up with the victory.

2.Houdini (rating~3385)

Houdini is a UCI chess engine developed by Belgian programmer Robert Houdart. It is influenced by open source engines IPPOLIT/RobboLito, Stockfish, and Crafty. Earlier versions are free for non-commercial use (up to version 1.5a), but later versions (2.0 and onwards) are commercial. As of January 2017, Houdini 5 is the second top-rated chess engine on major chess engines rating lists between Stockfish and Komodo.Chess commentator and video annotator CM Tryfon Gavriel compared Houdinis playing style to that of the Romantic Era of chess, where an attacking, sacrificial style was predominant.

1.Stockfish (rating:~3390)

Stockfish is a free and open source UCI chess engine, available for various desktop and mobile platforms. It is developed by Marco Costalba, Joona Kiiski, Gary Linscott and Tord Romstad, with many contributions from a community of open source developers.Stockfish is consistently ranked first or near the top of most chess engine rating lists and is the strongest open source chess engine in the world. It won the unofficial world computer chess championships in 2014, season 6, and 2016 season 9. It was a runner-up in 2013 season 5, 2014 season 7, and 2015 season 8. Stockfish is derived from Glaurung, an open source engine by Romstad.Stockfish is much stronger than the best human chess Grandmasters. In comparison, the curent world chess champion Magnus Carlsen has rating 2838.

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Top 10 strongest chess engines – Chesstutor | Learn how to …

Stockfish – Official Site

Powerful

Stockfish is one of the strongest chess engines in the world. It is also much stronger than the best human chess grandmasters.

Unlike most chess engines, Stockfish is open source (GPL license). That means you can read the code, modify it, contribute back, and even use it in your own projects.

You can use Stockfish on your computer running Windows, OS X, or Linux, or on your iOS or Android device. So you can get world-class chess analysis, wherever you are.

Visit link:

Stockfish – Official Site

Chess Engines Diary

Brainfish – UCI chess engine, JCER Rating=3422

From the author:Brainfish is a standard Stockfish chess engine extended by a general book format that is capable of handling a reduced part of Cerebellum, which is an innovative chess opening and playing book. In Brainfish, the book moves are only used in engine games, not in analysis mode.

All moves in the published book Cerebellum_light.bin generated by Cerebellum were calculated by usingStockfish as analysis engine, without using statistics. Then those moves where recalulated by the Cerebellum Library using a graph algorithm that makes all scores in the library consistant. Consistant scores means for example, in case the starting position has a score of 0.2 and a best move is 1.e4, the position after 1.e4 must have the score -0.2. Additionally, some others properties are found, like the best main line of a position and possible Transitions.

Hence, when Brainfish is playing moves that are in the Cerebellum book, it plays like Stockfish reg

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Chess Engines Diary

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 180614, which defeated Komodo 12.1.1 in the TCEC Season 12 Superfinal 100-game match held in JuneJuly 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into five qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion. Pondering is set to off. All engines run on mostly the same hardware[9] and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[10] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Main Seasons

Other TCEC tournaments

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

Excerpt from:

Top Chess Engine Championship – Wikipedia

Free Chess Engines

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Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 180614, which defeated Komodo 12.1.1 in the TCEC Season 12 Superfinal 100-game match held in JuneJuly 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into five qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion. Pondering is set to off. All engines run on mostly the same hardware[9] and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[10] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Main Seasons

Other TCEC tournaments

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

The rest is here:

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 180614, which defeated Komodo 12.1.1 in the TCEC Season 12 Superfinal 100-game match held in JuneJuly 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into five qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion. Pondering is set to off. All engines run on mostly the same hardware[9] and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[10] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Main Seasons

Other TCEC tournaments

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

Go here to read the rest:

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 180614, which defeated Komodo 12.1.1 in the TCEC Season 12 Superfinal 100-game match held in JuneJuly 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into five qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion.

pondering is set to off. All engines run on the same hardware and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[9] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

See the rest here:

Top Chess Engine Championship – Wikipedia

Free Chess Engines

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Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 180614, which defeated Komodo 12.1.1 in the TCEC Season 12 Superfinal 100-game match held in JuneJuly 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into five qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion.

pondering is set to off. All engines run on the same hardware and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[9] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

Follow this link:

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 180614, which defeated Komodo 12.1.1 in the TCEC Season 12 Superfinal 100-game match held in JuneJuly 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into five qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion.

pondering is set to off. All engines run on the same hardware and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[9] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

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Top Chess Engine Championship – Wikipedia

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Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 260318, which defeated Houdini 6.03 in the TCEC Season 11 Superfinal 100-game match held in March April 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into four qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion.

pondering is set to off. All engines run on the same hardware and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[9] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

Follow this link:

Top Chess Engine Championship – Wikipedia

Free Chess Engines

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computer_chess:engines:myrddin:index – Computer Chess Wiki

First of all, thanks very much to Ron Murawski for making this site available and hosting Myrddin here!

Version 0.87 to be released soon! This version supports SMP via processes (up to 16 instances) and is about 10 ELO stronger than v0.86 at 1 CPU and about 50 ELO stronger at 4 CPUs. This version has not been formally tested above 4 CPUs so it is unknown how well it will scale above 4 CPUs.

Myrddin 0.87 (released 1/25/15, CCRL rating estimated at 2385 at 1 CPU and 2435 at 4 CPUs)

Myrddin 0.86 (released 12/21/12, CCRL rated approximately 2360)This package contains Windows32/64, Linux32/64, & Android executables compiled by Jim Ablett, and a Mac executable compiled by Julien Marcel, author of the Prdateur chess engine. Myrddin 0.85 (released 5/3/11, CCRL rated approximately 2220) Myrddin 0.84 (released 9/17/10, CCRL rated approximately 2115) Myrddin 0.83 (released 2/22/10, CCRL rated approximately 2015) Myrddin 0.82 (released 9/26/09, estimated CCRL rating of 1915) Myrddin Alpha 2 (released 5/26/09, estimated CCRL rating of 1550) Myrddin Alpha 1 (released 3/9/09, estimated CCRL rating of 1150)

Myrddin 0.87 1/20/15

Myrddin is a winboard-compliant chess engine to a reasonable degree. It supports protover 1 primarily to support the Chessmaster interface, and also protover 2.

If you don’t know what Winboard is, and you only just want to play against this engine, you can download Winboard-compliant interfaces here:

The 64-bit version of Myrddin should play approximately 2380 ELO against chess engines at 1 CPU (using CCRL rating), and probably 100 points higher against humans. This is an improvement of approximately 30 points compared to the previous release. Myrddin should play about 90 points stronger at 4 CPU.

The following winboard commands are supported:

Myrddin also supports the following non-winboard commands:

eval returns a static evaluation of the current game position

perft N standard perft algorithm to calculate the number of leaf nodes of depth N from the current position. Note that Myrddin will not respond to any input until the perft calculation is finished.

divide N extension to perft algorithm showing the number of leaf nodes of depth N from the current position, divided among each legal move from the current position.

tb toggles Gaviota endgame tablebase support

None of these commands are supported while Myrddin is searching/analyzing.

It is crucial that the winboard UI send the time command to the engine, as Myrddin does not have an internal clock. Post is ON by default, as opposed to the winboard protocol. This is just for debugging convenience and it appears that a lot of engines do it this way anyway.

This is the first version to support SMP. The implementation is based on Dan Homan’s lazy SMP idea. Myrddin uses multiple slave processes to fill the transposition, eval and pawn hash tables so the parent process can search deeper in the same amount of time. Myrddin uses Pradyumna Kannan’s magicmoves code for move generation of sliding pieces. Evaluation is rather simple: wood counting, piece square tables, pawn structure, rudimentary king safety, rooks behind passers. There’s still a long way to go here. Search is basic alpha/beta, with reasonable and generally conservative extensions and reductions. All user-modifiable parameters are supported in the INI file, an example of which is included in the download. Max search depth is 128. The ProDeo opening book is used by kind permission of Ed Schrder. Draw claims from the opponent are not supported. Myrddin does, however, claim all draws by rule, as well as checkmate. There is enough winboard support to play games on ICS. But without support for draw I’m sure there are some scary loopholes and/or exploits. When the engine is in analysis mode, positive scores always favor White and negative scores always favor Black. When the engine is thinking or pondering, positive scores favor Myrddin. Logfiles will be in the logs folder below the folder where you ran Myrddin. The output of the log is not very interesting just PV output and communication reality-check stuff. If you are running Myrddin with multiple CPUs, there will be one logfile for each process.

Myrddin’s first official tournament was in the Promotional division of ChessWar XIV and was rated at 1655 over 11 rounds. Myrddin scored 6.5 points (+5 =3 -3) and placed 51st out of 212 engines rated between 1859 and 812. The median engine rating was 1499. To see the PGN of Myrddin’s games and see some comments, read this journal. Much of the development between Alpha 1 and Alpha 2 occurred during this tournament.

Myrddin participated in OpenWar 6. This was a round-robin tournament with 92 engines. Myrddin finished in 68th place with 27 points (+22 =10 -59). Myrddin’s best legitimate results were a win against Firefly (rated about 2050) and a draw against Timea (rated about 2150). It managed to get a win against one of the top 10 (Cippolino) thanks to a crash. It also got two draws against two very strong engines (DanaSah and N2) due to endgame blunders, and a win against another top engine (Tornado) due to a crash. Much of the development for version 0.82 occurred during this tournament, and the last few rounds were played with 0.82.

Version 0.82f (unreleased and slightly better than 0.82) participated in the 5th Division of WBEC Ridderkerk 17. There were 84 engines in this division, and the division was broken down into three groups of 28 engines each, each group having a double round-robin tournament. As expected, Myrddin finished in the middle of the pack, in 14th place with 31.5 points out of 54 games (+28 =7 -19).

Version 0.82f also participated in the Promotional division of ChessWar XV. This tournament was very similar to Myrddin’s first tournament, ChessWar XIV, except there are even more engines (242!). Because Myrddin was at least 300 points stronger than it was eight months previous, it finished in 9th place with 8.0 points (+7 =2 -2). This was a good enough performance to promote to the next division, Myrddin’s first promotion. Myrddin now has a bit of a reputation as a very lucky engine, as it got a free point when GnuChess (a typically very stable engine) crashed in a Mate in 3 position. Without that crash, Myrddin would have finished about 20 places lower and would not have promoted.

Versions 0.83 through 0.83k participated in OpenWar 7. This was a round-robin tournament with 76 engines. I was hoping that Myrddin would place around 55th and score about 25 points. But, despite some noticeable improvements in Myrddin that went into version 0.84, Myrddin performed poorly and finished in 62nd place, with only 20.5 points (+14 =13 -48). Myrddin’s best results were draws against the 11th place engine, WaDuuttie, and the 20th place engine, Rotor. Both of these engines are rated 2500+. Its best win was against the 45th place engine, Sungorus, rated 2300+. The only other good thing that can be said is that Myrddin had good results against the 18 engines that finished immediately above him (+3 =9 -6).

Version 0.84 participated in the F division of ChessWar XVI. There were 80 engines in the tournament and Myrddin was seeded 70th. Myrddin finished respectably in 49th place with 5 points (+3 =4 -4). Its best performance was a draw against the engine that finished in 6th place.

Version 0.84 (32-bit) was the first version to win any tournament, doing so in the 23rd Series the CCRL Amateur Division 7. It competed with nine other engines in a double-round robin and won with a score of 23.5 out of 36 (+20 =7 -9). This victory promoted Myrddin to Division 6.

Version 0.84g (unreleased and clearly better than 0.84) participated in the 5th Division of WBEC Ridderkerk 18. There were 98 engines in this division, and the division was broken down into three groups of 32-34 engines each, each group having a double round-robin tournament. The hope was that Myrddin could place in the top 6 in his group, thereby reaching the final. Myrddin did accomplish this, scoring 55 points in 66 games and placing 4th. The final was another double round-robin with the top 18 engines (6 from each group), and the top 7 would promote to the 4th division. Myrddin managed to achieve this by placing 7th, scoring 18 points in 34 games.

Versions 0.84g through 0.85 participated in OpenWar 8. This was a round-robin tournament with 78 engines. I was hoping that Myrddin would place close to 40th and score about 37-38 points. This tournament was a mixed bag, as Myrddin drew 10 of the engines that finished between 15th and 30th places (and all 6 engines between 15-20: Brutus, Hermann, Dirty, Arasan, Francesca MAD and Gaviota). But some poor performances against weaker engines kept Myrddin from achieving my goal. Myrddin finished in 46th place with 34.5 points.

All results are for the 64-bit version of 0.85 using 128MB hash and 5-man Gaviota tablebases. The tests are run on an AMD 9650 Quad 2.3GHz machine (although Myrddin does not support multiple CPUs). Running all of the below tests takes approximately 5 hours.

300 positions at 5s per position. Almost exclusively tactical positions, many leading to mate. Myrddin finds 295 correct moves within the time limit. Regarding the five missed positions, two (141, 222) are found within 10 seconds, one (293) is found within 30 seconds, and two (17, 230) are not found within one minute. This suite can be found here.

A series of (currently, but occasionally expanding) 14 individual suites of 100 positions each, primarily intending to test positional knowledge such as square vacancy, proper recapturing, pawn advancement, control of the center, etc. At 10s per move, Myrddin gets 789 out of 1400 positions correct. This suite is also interesting because it contains partial credit. In other words, you can still get some points by choosing moves other than the optimal. Myrddin gets 9,556 out of 14,000 points if partial credit is included. You can download this test suite here.

176 positions at 10s per position. Combinative middlegame and endgame suite. Myrddin finds 134 positions within the time limit. You can download this test suite here.

100 positions at 10s per position. Myrddin does not do very well at this suite, getting only 20 correct moves within the time limit. You can download this test suite here.

182 positions at 10s per position. Challenging tactical suite. Myrddin finds 149 positions within the time limit. You can download this test suite here.

For a list of (hopefully) interesting test positions that I have accumulated during the development of Myrddin, go here.

Many parts of the code from Myrddin contain ideas and/or algorithms gathered from studying the source code of other engines. Most notably, Stockfish, Fruit, Crafty and Greko are well-written, well-documented and relatively easy to understand even for a mediocre programmer like myself. The list of features implemented (and sometimes modified or discarded altogether) from these ideas would be too long to go into here. But I can safely say that all code in Myrddin is my own, written either from scratch or based on these ideas, with the following exceptions: Myrddin’s Winboard interface is based on Tom Kerrigan’s excellent TSCP engine, for which Tom has graciously given permission. Myrddin’s SEE implementation is based on pseudo-code generously given to me by Andres Valverde, author of EveAnn and part of the Dirty development team.

Initial Release, rated approximately 1200-1300

Reduced move generation time by ~21% (perft 6 on initial position went from 57 to 44 seconds on P4-3.0) Search now pings the input command handler every 8K nodes (about 1/30-1/50 second, depending on position and hardware), so applicable commands can now be entered during search/analysis Search will allocate extra thinking time when it gets noticeable drop in score Evaluation improvements pawn structure, open and semi-open files for rooks, rooks behind passers, king safety Added MVV/LVA and PV Move Ordering Added Killer and History move ordering heuristics Added Null Move reductions Added Late Move reductions Added Opening Book (ProDeo Thanks, Ed!) Added pondering, so hard and easy commands are now supported analyze, ? and result commands are now supported level command is now fully supported for all time control types Added check for dirty pawn structure before evaluation Search can be interrupted due to time management considerations Added Hash Tables, with a fixed size of 128MB Maximum search depth increased from 20 to 30 Fixed a bug with evaluating castling moves Fixed a bug determining which King piece table to use Can now generate capturing moves only so quiescent search has less moves to sort/deal with Quiescent moves are added to PV Added code for pushing lone King towards edge of board Added material and 50-move draw detection Fixed a bug in the undo and remove commands Fixed some bugs in the 3-fold repetition detection Fixed a stupid bug that caused me to check for user input WAY too often many thanks to Bob Hyatt for pointing me in the right direction Significant code cleanup

Removed Alpha designation from version number Commandline parameters are now supported Increased max search depth to 50 Reduced move generation time by ~15% (perft 6 of initial position on a P4-3.0 went from 44s to 38s) Now claiming checkmates, 50-move draws and 3-fold repetition draws Plays a move after completing a depth 3 search if there is only one legal reply Will not play a move if in the middle of resolving a fail low or fail high at the root Will never use more than 1/4 of remaining time Greatly improved time management for bullet games. Version 0.81 could lose as many as 20% of its games on time at 2 minutes per game. Version 0.82 now only loses about 1% of its games on time at 1 minute per game, and only very rarely will lose a game on time at other time controls. Many thanks to Lars Hallerstrom (The Mad Tester!) for all of his assistance in helping determine if my fixes actually improved anything. Myrddin should never lose on time in games with increments. Quiescence search now only searches recaptures after depth 1 Added promotions to Quiescence search Added aspiration window Improved Late Move Reductions parameters Fixed a bug in the Principal Variation search Pondering is now OFF by default Evaluation adjustments:

bishops and knights are scored at 310 centipawns, as Myrddin was susceptible to trading two pieces for rook+pawn

increased penalty for doubled/tripled pawns

for doubled/tripled pawns, added further penalty if they are blocked

added larger bonus for passed pawn on the 7th

adjusted bishop piece tables to encourage occupation of long(er) diagonals

modified the lone king piece table to give larger penalites as the king goes towards the edge/corner

Added knowledge of knight outposts (in enemy territory, supported by pawn, cannot be attacked by enemy pawn) Piece and wood counting are now done incrementally Fixed a bug in which the 50-move counter could be set to zero if the move being pondered was a zeroing move and the opponent did not play that move Fixed a bug in which the engine would go into an endless loop if it reached (max_search_depth + 1) during pondering or analysis Fixed a bug in which the engine would go into an endless loop if there were no legal moves during analysis Fixed a bug in the evaluation of Black doubled/tripled pawns Added code to handle KPvK endings Added code to recognize various material draws, such as KNNvK Added code to recognize insufficient mating material for materially winning side (e.g. KNNvKP or KBvKP) Added code for rook pawn and wrong colored bishop against lone king in promoting corner (from a loss to Sorgenkind in OpenWar) Now only adding en passant square to hash signature if en passant capture is possible Added ? and ! comments to PV output for fail lows and fail highs Logfiles are now created in a logs folder below the Myrddin executable program, as requested by Lars

Only search to depth 1 when there is only one legal move and pondering is off No longer clearing the hash table before starting a depth 1 search Improved hash replacement strategy If a search depth was reduced by late-move reductions, and that search improves alpha, now researching at proper depth Reductions are now less aggressively implemented Adjusted the second aspiration window from 300 to 110 centipawns Doubled (or worse) passed pawns after the leading pawn no longer get the passed pawn bonus Will now play a move in a checkmating line as soon as it is confirmed to be optimal Removed Result from checkmate reporting Rook and minor vs rook (with no pawns) is now hard-coded as a draw should be safe in 99.99% of cases Re-removed bad king safety code Now using piece square table for knight outposts, rather than a hard-coded bonus Modified piece square table for kings in opening and middlegame Added penalty for having no pawns, to help avoid trading down into pawnless endgames (e.g. rook vs. minor) Sending the ‘.’ command during analysis no longer restarts the analysis from depth 1. The ‘.’ command is still not implemented, though. Fixed a bug in which most hash moves were not getting placed at the beginning of the move order Fixed a bug evaluating Black doubled and passed pawns Fixed a bug in which the initial position was not being checked for draw by repetition Fixed a bug maintaining wood tables when unmaking a promotion move Fixed an asymmetrical problem in the bishop piece square table Fixed a problem with determining if a rook or queen was behind a passed pawn Fixed a problem with calculating the pawn shield of a king on column h, or a king not on his home row fixed a bug updating the board signature after making a null move when en passant was possible king+rook vs. king+minor is now being scored as a draw

Added Gaviota tablebases (thanks so much to Miguel Ballicora, also the author of the Gaviota chess engine, for making this available!) Added initialization file for setting hash size, creating log file, turning on kibitz, and tablebase info Fixed a bug in which a hash probe would not return a hash move if the saved depth was less than the requested depth (thanks to Edmund Moshammer, author of Glass!), so in these cases the hash move would not be used for move ordering Implemented fail-hard Tweaked parameters for reductions (yet again) Adjusted queen value from 900 to 950 and minor piece value from 310 to 320 Adjusted bishop pair bonus from 20 to 30 Removed second aspiration window Lazy eval is now more conservative Will now analyze the entire depth if the first move searched fails low, or if first move fails high in a non-mate situation Increased maximum search time to half of the remaining clock (required due to above item) Added support for winboard computer command kibitz PV, book moves and Mate in N Increased max half-moves in a game to 1024 Fixed a bug in which the first move searched at the root was saved in the hash table as an exact value even if it did not improve alpha Fixed a bug in which Myrddin would run out of time by thinking indefinitely if it was told it had a negative amount of time on its clock (can happen on ICS due to lag) Modified the check to see if null move is allowable, previously was if any piece was on board, now only if side to move has at least one piece

Almost complete rewrite of the evaluation, in particular the pawn structure evaluation and king safety. Also added mobility factor and significantly adjusted many piece table values Added SEE (thanks, Andrs!) Added futility pruning Added resign. See Myrddin’s INI file for instructions, as this is off by default Added second aspiration window at 150 centipawns Cleaned up code for how reductions/extensions are used to modify depth in search calls Will now claim draw by insufficient material, but only checking for bare kings or at most one minor on board Now generating all moves in quiescent search if side to move is in check Now searching all moves in order of their move score order, instead of just the first four moves and then taking the rest as they were generated Some changes to the transposition table replacement strategy Fixed a bug in which the en passant square was not being passed to the Gaviota tablebase probe Fixed a bug in which the 50-move draw check was not checking that the drawing move was also checkmate Fixed a bug in which the flag for a mate threat found during null move was not being stored in the hash table Fixed a bug in which a hash entry could be saved when the engine was forcibly bailing out of a search Fixed a bug that could cause Gaviota tablebases folder to not be read properly from the INI file

Finished conversion to bitboards from 088 Added pawn hash (thanks again, Dann!) Removed lazy eval Added support for winboard st and sd commands Lots of bug fixes either discovered by the bitboard conversion or removed by them (of course, new bugs added!)

Added SMP support for up to 16 instances (using processes and shared hash memory Very Lazy SMP!) only tested up to 4 instances! This use of shared memory for all hash tables (transposition, eval and pawn) means that the reported memory usage may appear to be incorrect depending on what program you use to get the information. Beware! Fixed very embarrassing bug in passer eval calculating the distance between two squares that could cause any number of other issues, even a hang or crash Added support for the cores command which changes the number of processes being used when SMP is enabled. The initial value will be based on ini file settings. Added a tb command which toggles tablebase support. The initial value will be based on ini file settings. Added Mate in N announcements to PV output when applicable Fixed a bug in saving scores near mate to the hash table Fixed a bug in determining valid knight outpost squares Fixed text output bug in kibitzing opening book moves on ICC Fixed a rare bug in determining material draw Fixed a bug in which Myrddin would hang or crash if the ‘.’ command (used by Chessmaster GUI) was sent while Myrddin was pondering Fixed a bug that could cause hash memory allocation to fail if more than 1GB was requested. Thanks to Graham Banks for reporting this issue.

Many thanks to the following brilliant people who helped/guided me (either directly or indirectly) in countless ways with their work:

Lars Hallerstrm – The Mad Swedish Tester! I would never release anything without his (grudging) approval.

Dann Corbit Without whose generous help, huge speed improvements, bug fixes and general suggestions, the first bitboard version (v0.86) would not have been released

Pham Hong Nguyen Firstchess

Please send bug reports and general suggestions/comments to JohnVMerlino@gmail.com.

Thanks for playing!

John Merlino

Read more here:

computer_chess:engines:myrddin:index – Computer Chess Wiki

Top Chess Engine Championship – Wikipedia

Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC season was held in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

Since season 5, TCEC has been sponsored by Chessdom Arena.[7][8] The current TCEC champion is Stockfish 260318, which defeated Houdini 6.03 in the TCEC Season 11 Superfinal 100-game match held in March April 2018.

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into four qualifying stages and one Superfinal, where the top two chess engines battle it out over a series of 100 games to win the title of TCEC Grand Champion.

pondering is set to off. All engines run on the same hardware and use the same opening book, which is taken from recent strong human Grandmaster tournaments, truncated to the first 6 or 8 moves, and changed in every stage. Large pages are disabled but access to various endgame tablebases is permitted. Engines are allowed updates between stages; if there is a critical play-limiting bug, they are also allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterion for entering into the competition, other than inviting the top participants from various rating lists. The list of participants was personally chosen by Thoresen before the start of a season. His stated goal was to include “every major engine that is not a direct clone”.[9] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported.

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

Follow this link:

Top Chess Engine Championship – Wikipedia