Zen (software)

Zen, sold as Tencho no Igo (Japanese: 天頂の囲碁, literally Zenith Go) in Japan, is a closed source Go playing engine developed by Yoji Ojima (尾島陽児), a Japanese Go programmer.

History to 2016

Zen won a gold medal in 14th Computer Olympiad in May 2009.^[1] It won the Computer Go UEC Cup in 2011, 2014, and 2016.

In 2011, Zen19D reached 5 dan on the KGS Go Server, playing games of 15 seconds per move. The account which reached that rank uses a cluster version of Zen running on a 26-core machine.^[2]

In 2012, Zen beat Takemiya Masaki 9p by 11 points (it received five handicap stones), followed by a 20-point win (receiving four handicap stones) in the 6th E&C Symposium in Japan.^[3]

Zen defeated Kobayashi Koichi (Zen receiving three handicap stones) in the 4th Densei-sen on 23 March 2016.^[4]

Zen's first commercial version was released in Japan on 18 September 2009. Zen 2 was released on 27 August 2010, Zen 3 on 30 September 2011, Zen 4 on 27 July 2012, and Zen 5 on 13 December 2013.

2016 onwards: DeepZenGo

After the AlphaGo AI defeated professional players Fan Hui 2p and Lee Sedol 9p in 2015 and 2016, Yoji was inspired to upgrade Zen with deep learning algorithms. In November 2016, “DeepZenGo” played and lost a three-game match against Cho Chikun 9p; the AI won one game and lost the other two. Its win in that match made it the second Go-playing computer program (after AlphaGo) to win against a top human player without receiving handicap stones.

In March 2017, DeepZenGo played games against Mi Yuting, Park Junghwan, and Iyama Yuta, losing to Mi and Park, but defeating Iyama.^[5] Around the same time, DeepZenGo participated in the 2017 Computer Go UEC Cup, coming second behind Fine Art. Both programs then won their exhibition matches against Ichiriki Ryo, 7-dan Japanese professional.

Example game

DeepZenGo (white) v. Ichiriki Ryo (26 March 2017), DeepZenGo won by resignation; Black's bottom left group is dead.

First 99 moves (54 at 45, 77 at 69)

Moves 100-162 (108 at 96, 111 at 105, 123 at 69, 127 at 72)

References

^ "Zen's record". International Computer Games Association. Retrieved 14 April 2016.
^ "KGS Game Archives". Retrieved 28 January 2016.
^ "Zen computer Go program beats Takemiya Masaki with just 4 stones!". Go Game Guru. Retrieved 28 January 2016.
^ "4th Densei-sen". Retrieved 14 April 2016.
^ "Korea's Park Jeong Hwan 9P wins 2017 World Go Championship, claims "best player" title". American Go E-Journal. 2017-03-24. Archived from the original on 2019-07-09.

v t e Go
Overview	Handicaps Komi Rules
Equipment	Bowls Goban Katsura Kaya Stones Clamshell Slate Yunzi
Terms	Aji Atari Board positions Dame Divine move Double hane Eyes Gote, sente and tenuki Hane Hayago Jigo Joseki Kakari Keima Kiai Kikashi Ko Komi Korigatachi Kosumi Ladder Liberty Miai Monkey jump Moyo Myoushu Nakade Nerai Myoushu Peep Pincer Probe Sabaki Seki Sente Shape Shoulder hit Tesuji Thickness Yose
Strategy and tactics	Capturing race Fuseki Chinese Kobayashi Shinfuseki Shusaku Jōseki Nadare Taisha Ko fight Ladder Life and death Mirror Go Opening theory Proverbs Shape Empty triangle Ponnuki Tenuki Tsumego
History	Classic of Arts Dunhuang Go Manual Emperor Yao Four Go houses Four arts Hoensha 9 Pin Zhi Oskar Korschelt Oshirogo Players European players Female players Nihon Ki-in Hall of Fame Professional handicaps
Competition	Go professional Ranks and ratings Dan Kyū Honorary titles Jubango Title holders Tournaments
Games and matches	AlphaGo vs. Fan Hui AlphaGo vs. Ke Jie AlphaGo vs. Lee Sedol Atomic bomb game Blood-vomiting game Ear-reddening game The Game of the Century Kamakura jubango Lee's broken ladder game
Art and media	AlphaGo The Divine Move The Girl Who Played Go The Go Master The Go Player Go World Hikaru no Go Igo Hatsuyōron Long Ode to Watching Weiqi The MANIAC The Master of Go Ranka Sensei's Library Shibumi The Surrounding Game The Weiqi Devil
Computers	Computer Go UEC Cup Engines AlphaGo AlphaGo Master AlphaGo Zero AlphaZero Crazy Stone Darkforest Fine Art GNU Go KataGo Leela Leela Zero Zen Future of Go Summit Monte Carlo tree search Smart Game Format Servers KGS Go Server Pandanet Tygem
Organizations	American Go Association Australian Go Association British Go Association China China Qiyuan Chinese Weiqi Association Hong Kong Go Association European Go Federation French Federation of Go International Go Federation Irish Go Association Japan All Japan Student Go Federation Kansai Ki-in Nihon Ki-in Korea Korea Baduk Association Myongji University Mind Sports Organisation New Zealand Go Society Singapore Weiqi Association Taiwan Chi Yuan Culture Foundation
Other	Benson's algorithm Game record (kifu) Games played with Go equipment Go and mathematics Variants Batoo Capture go Sygo
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