Crazy Stone (Champion Go on

iOS iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone; the term also includes ...

and Android platforms) is a Go playing engine, developed by

Rémi Coulom Rémi Coulom (born 1974) is a French computer scientist, once an assistant professor of computer science at the Lille 3 University, and the developer of Crazy Stone (software), Crazy Stone, a computer Go program. In 2006, Rémi Coulom described the ...

, a French computer scientist. It is one of the first computer Go programs to utilize a modern variant of the

Monte Carlo tree search In computer science, Monte Carlo tree search (MCTS) is a heuristic search algorithm for some kinds of decision processes, most notably those employed in software that plays board games. In that context MCTS is used to solve the game tree. MCTS ...

. It is part of the

Computer Go Computer Go is the field of artificial intelligence (AI) dedicated to creating a computer program that plays the traditional board game Go. The field is sharply divided into two eras. Before 2015, the programs of the era were weak. The best ...

effort. In January 2012 Crazy Stone was rated as 5

dan Dan or DAN may refer to: People * Dan (name), including a list of people with the name ** Dan (king), several kings of Denmark * Dan people, an ethnic group located in West Africa **Dan language, a Mande language spoken primarily in Côte d'Ivoi ...

on KGS, in March 2014 as 6 dan.Crazy Stone's profile

Sensei's Library Sensei's Library (commonly referred to as SL among Go-players) is an Internet website and wiki A wiki ( ) is an online hypertext publication collaboratively edited and managed by its own audience, using a web browser. A typical wiki conta ...

. Retrieved 2 February 2010

History

Coulom began writing Crazy Stone in July 2005, and at the outset incorporated the Monte Carlo algorithm in its design. Early versions were initially available to download as freeware from his website, albeit no longer.Crazy Stone's ICGA record
. International Computer Games Association. Retrieved 2 February 2010 Pattern recognition and searching was added in 2006, and later that year Crazy Stone took part in its first tournament, winning a gold medal in the 9x9 competition at the 11th Computer Olympiad. Coulom subsequently entered the program into the 12th Computer Olympiad the following year, winning bronze in the 9x9 and silver in the 19x19 competitions. However, Crazy Stone's most significant accomplishment was to defeat

Kaori Aoba is a female professional 5 ''dan'' Go player. She is currently an affiliate of the Nihon Ki-in, the largest Go association of Japan, and was a student of Yasumasa Hane. On 4 September 2008, Aoba was defeated by Crazy Stone, a Monte-Carlo Tree ...

, a professional Japanese 4 dan, in an 8-stone handicap match in 2008. In doing so, the engine became the first to officially defeat an active professional in Japan with a handicap of less than nine stones. Three months later, on 12 December 2008, Crazy Stone defeated Aoba again in a 7-stone match.Crazy Stone defeats Kaori Aoba

. Retrieved 2 February 2010 In March 2013, Crazy Stone beat

Yoshio Ishida is a professional Go player and author of several books on Go. Biography By the time he was 8, Ishida started learning Go. He was a student at the legendary Kitani Minoru go school. Famous along with his fellow students Cho Chikun, Kobayas ...

, Japanese 9-dan former

Honinbo In the history of Go in Japan, the four Go houses were four major schools of Go instituted, supported, and controlled by the state, at the beginning of the Tokugawa shogunate. (There were also many minor houses.) At roughly the same time shogi w ...

Meijin is one of the eight titles in Japanese professional shogi, and is the most prestigious title, along with Ryūō. The word ''meijin'' (名 ''mei'' "excellent, artful", 人 ''jin'' "person") refers to a highly skilled master of a certain field (t ...

, in a 19×19 game with four handicap stones. On March 21, 2014, at the second annual Densei-sen competition, Crazy Stone defeated

Norimoto Yoda is a professional Go player. Biography Yoda is a student of Takeo Ando. He has won 35 titles so far in his career, the seventh highest in Japan. He became a professional in 1980, and reached 9 dan in 1993. In 2006, he was the heart of the Jap ...

, Japanese professional 9-dan, in a 19x19 game with four handicap stones by a margin of 2.5 points.

Performance

*29/05/2006 - Gold medal in the 9x9 tournament at the 11th Computer Olympiad,

Turin Turin ( , Piedmontese language, Piedmontese: ; it, Torino ) is a city and an important business and cultural centre in Northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital ...

. *01/06/2006 - Finished 5th in the 19x19 tournament at the 11th Computer Olympiad,

. *13/06/2007 - Bronze medal in the 9x9 tournament at the 12th Computer Olympiad,

Amsterdam Amsterdam ( , , , lit. ''The Dam on the River Amstel'') is the Capital of the Netherlands, capital and Municipalities of the Netherlands, most populous city of the Netherlands, with The Hague being the seat of government. It has a population ...

. *17/06/2007 - Silver medal in the 19x19 tournament at the 12th Computer Olympiad,

. *02/12/2007 - Won the first

Computer Go UEC Cup The Computer Go UEC Cup is an annual worldwide computer Go tournament held at the University of Electro-Communications (UEC) in Tokyo Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital ...

.First Computer Go UEC Cup
.

University of Electro-Communications The is a national university in the city of Chōfu, Tokyo, Japan. It specialises in the disciplines of computer science, the physical sciences, engineering and technology. It was founded in 1918 as the Technical Institute for Wireless-Commun ...

. Retrieved 2 February 2010 *04/09/2008 - Defeated Kaori Aoba in an 8-stone handicap match. *14/12/2008 - Won the second Computer Go UEC Cup. *14/12/2008 - Defeated Kaori Aoba in a 7-stone handicap match. *29/11/2009 - Finished 9th in the third Computer Go UEC Cup.

Notes

External links

Crazy Stone website
{{Go (game) Go engines

History

Performance

Notes

Further reading

External links