Lee Sedol

This is a Korean name; the family name is Lee.
Lee Sedol

Lee Sedol during a game in 2012
Hangul 이세돌
Hanja 李世乭
Revised Romanization I Sedol
McCune–Reischauer Ri Sedol
Born (1983-03-02) 2 March 1983[1]
Sinan County, South Jeolla Province, South Korea
Residence South Korea
Teacher Kweon Kab-yong[1]
Turned pro 1995
Rank 9 dan[1]
Affiliation Hanguk Kiwon[1]
Lee Sedol
Medal record
Representing  South Korea
Asian Games
2010 Guangzhou Men's Team

Lee Se-dol (Korean: 이세돌; born 2 March 1983) is a South Korean professional Go player of 9 dan rank.[1] As of February 2016, he ranks second in international titles (18), behind only Lee Chang-ho (21). He is the fifth youngest (12 years 4 months) to become a professional Go player in South Korean history behind Cho Hun-hyun (9 years 7 months), Lee Chang-ho (11 years 1 months), Cho Hye-yeon (11 years 10 months) and Choi Cheol-han (12 years 2 months). His nickname is "The Strong Stone" ("Ssen-dol") and he was defeated by the computer program AlphaGo in a 1-4 series.[2]

Biography

Lee was born in South Korea in 1983 and studied at the Korea Baduk Association. He ranks second in international titles (18), behind only Lee Chang-ho (21). Despite this, he describes his opening play as "very weak".[3] Lee is married and has one daughter.[4] In February 2013, Lee announced that he planned to retire within three years and move to the U.S. to promote Go.[5] He plays on Tygem as "gjopok".[6] He is known as 'Bigeumdo Boy' because he was born and grew up on Bigeumdo Island.[7]

Lee's Broken Ladder Game

This was a match between Lee Sedol and Hong Chang-sik during the 2003 KAT cup. This game is notable for Lee's use of a broken ladder formation.

Normally playing out a broken ladder is a bad mistake, a pitfall associated with bad beginner play; the chasing stones are left appallingly weak. Between experts it should be decisive, leading to a lost game. Lee, playing black, defied the conventional wisdom, pushing development of the ladder to capture a large group of Hong's stones in the lower-right side of the board. Although Black could not capture the stones in the ladder, White ultimately resigned.[8]

Moves 67 to 74
(Black: Lee Sedol; White: Hong Chang-sik)
Moves 89 to 97
(Black wins when White resigns at move 211)

Match against AlphaGo

Starting March 9, 2016, Lee played a five-game match, broadcast live, against the computer program called AlphaGo, developed by a London-based artificial intelligence firm Google DeepMind, for a $1 million match prize.[9][10][11] He said “I have heard that Google DeepMind’s AI is surprisingly strong and getting stronger, but I am confident that I can win at least this time”.[12] In an interview with Sohn Suk-hee of JTBC Newsroom on February 22, 2016,[13] he showed self-confidence again, while saying that even beating AlphaGo by 4-1 may allow the Google DeepMind team to claim its de facto victory and the defeat of him, or even humankind. In this interview he pointed out the time rule in this match, which seems well-balanced so that both he and the AI would fairly undergo time pressure.

In another interview at Yonhap News, Lee Se-dol said that he was confident of beating AlphaGo by a score of 5-0, at least 4-1 and accepted the challenge in only five minutes. He also stated "Of course, there would have been many updates in the last four or five months, but that isn’t enough time to challenge me".[14]

On March 9, he played black and lost the first game by resignation.[15] On March 10, he played white and lost the second game by resignation.[16] On March 12, he played black and lost the third game as well.[17] On March 13, he played white and won the fourth game, following an unexpected move at White 78 described as "a brilliant tesuji", and by Gu Li 9 dan as "the hand of God" and completely unforeseen by him. GoGameGuru commented that this game was "a masterpiece for Lee Sedol and will almost certainly become a famous game in the history of Go".[18] Lee commented after the victory that he considered AlphaGo was strongest when playing white (second). For this reason, he requested that he play black in the final fifth game, which is considered more risky. On March 15, he played black and lost the fifth game, to lose the Go series 1-4.[19]

Lee confessed after the match "As a professional Go player, I never want to play this kind of match again. I endured the match because I accepted it."[20]

Promotion record

Rank Year Notes
1 dan

1995 Promoted to professional dan rank after passing qualifying test.
2 dan

1998
3 dan

1999
4 dan

2003
5 dan

2003
6 dan

2003 Won the LG Cup against Lee Chang-ho.
7 dan

2003 Runner up in the KT Cup against Yoo Changhyuk.
8 dan

2003 Skipped over because of the Hanguk Kiwon promotion rules.
9 dan

2003 Won Fujitsu Cup against Song Tae Kon.

Career record

  • 1997–98: 0 wins, 1 loss, 0 jigos
  • 1998–00: 0 wins, 6 losses, 0 jigos
  • 2000–02: 55 wins, 29 losses, 0 jigos
  • 2002–04: 67 wins, 32 losses, 0 jigos
  • 2004–06: 64 wins, 23 losses, 0 jigos
  • 2006–08: 122 wins, 52 losses, 0 jigos
  • 2008–09: 72 wins, 23 losses, 0 jigos
  • 2009–10: 74 wins, 14 losses, 0 jigos
  • 2010–11: 18 wins, 5 losses, 0 jigos

Titles and runners-up

Ranks #3 in total amount of titles in Korea and #2 in international titles.

Domestic
Title Wins Runners-up
Guksu 2 (2007, 2009) 1 (2014)
Myungin 3 (2007, 2008, 2012) 1(2013)
Siptan 1 (2011)
GS Caltex Cup 3 (2002, 2006, 2012) 2 (2007, 2013)
Prices Information Cup 3 (2006, 2007, 2010) 1 (2008)
Chunwon 1 (2000) 2 (2006, 2008)
KBS Cup 2 (2006, 2014) 3 (2001, 2004, 2009)
Maxim Cup 4 (2005–07, 2014) 1 (2013)
Wangwi 2 (2002, 2004)
Baedalwang 1 (2000)
BC Card Cup 1 (2002)
KTF Cup 1 (2002)
KT Cup 1 (2003)
SK Gas Cup 1 (2002) 1 (2000)
New Pro King 1 (2002)
Paedal Cup 1 (2000)
Olleh KT Cup 2 (2010, 2011)
Total 27 15
Continental
China–Korea New Pro Wang 1 (2002)
China–Korea Tengen 1 (2001)
Total 1 1
International
Asian TV Cup 4 (2007, 2008, 2014, 2015) 1 (2009)
LG Cup 2 (2003, 2008) 2 (2001, 2009)
BC Card Cup 2 (2010, 2011)
Samsung Cup 4 (2004, 2007, 2008, 2012) 1 (2013)
Chunlan Cup 1 (2011) 1 (2013)
Fujitsu Cup 3 (2002, 2003, 2005) 1 (2010)
World Oza 2 (2004, 2006)
Zhonghuan Cup 1 (2005)
Mlily Cup (梦百合杯) 1 (2015/16)
Total 18 8
Career total
Total 46 24[21]

Korean Baduk League

Season Team Place Record
2007 Team No.1 Fire Insurance (Captain) 4th place 9–5[22]
2008 Team No. 1 Fire Insurance (Captain) 4th place 13–3[23]
2010 Team Shinan Chunil Salt (Captain) Champions 16–2[24]
2011 Team Shinan Chunil Salt (Captain) TBD 1–2[25]

Chinese A League

Season Team Place Record
2007 Team Guizhou (Captain) 2nd place 9–3[26]
2008 Team Guizhou (Captain) 2nd place 8–0[27]
2009 Team Guizhou (Captain) 8th place 6–4[28]

References

  1. 1 2 3 4 5 6 Lee SeDol. gobase.org. accessed 22 June 2010.
  2. ↑ "Google vs. Go: can AI beat the ultimate board game?". The Verge. Retrieved 2016-03-15.
  3. ↑ Lee Sedol Interview. justplaygo.com, accessed 22 June 2010. Archived July 5, 2010, at the Wayback Machine.
  4. ↑ An Younggil. "Biography of Lee Sedol". Retrieved 2013-02-11.
  5. ↑ An Younggil. "Interview with Lee Sedol". Retrieved 2013-02-11.
  6. ↑ King of Kings (Final): "gjopok" vs. "idontca1", game 3. gosensations.com, accessed 19 February 2012
  7. ↑ "서울경제:". economy.hankooki.com. Retrieved 2016-03-12.
  8. ↑ Sensei's Library: Lee Sedol - Hong Chang Sik - ladder game
  9. ↑ "Google to Livestream 'Go' Battle Between World Champ, AI Tech". PCMAG. Retrieved 2016-02-08.
  10. ↑ Elizabeth Gibney (27 January 2016). "Go players react to computer defeat".
  11. ↑ "Computer Says Go". The Economist. 30 January 2016. Retrieved 4 February 2016.
  12. ↑ "YouTube will livestream Google’s AI playing Go superstar Lee Sedol in March". VentureBeat. Retrieved 2016-02-08.
  13. ↑ "[인터뷰] 이세돌 "5대 0으로 이기지 않으면 의미 없다고 생각해"". news.jtbc.joins.com (in Korean). Retrieved 2016-02-25.
  14. ↑ http://english.yonhapnews.co.kr/search1/2603000000.html?cid=AEN20160223003651315
  15. ↑ "AlphaGo defeats Lee Sedol in first game of historic man vs machine match".
  16. ↑ "Google’s AI Wins Pivotal Game Two In Match With Go Grandmaster".
  17. ↑ "AlphaGo beats Lee Sedol in third consecutive Go game".
  18. ↑ https://gogameguru.com/lee-sedol-defeats-alphago-masterful-comeback-game-4/
  19. ↑ "Google's AlphaGo AI beats Lee Se-dol again to win Go series 4-1".
  20. ↑ "한국 바둑계 ‘감’으로 나섰다가 ‘아뿔싸’" [Korea Baduk Association ventured into "without thought" and "Yow"] (in Korean). The Hankyoreh. March 16, 2016.
  21. ↑ Lee Sedol 9p gogameworld.com, accessed 22 June 2010
  22. ↑ "2007 Korean Baduk League". igokisen.web.fc2.com. Retrieved 13 June 2011.
  23. ↑ "2008 Korean Baduk League". igokisen.web.fc2.com. Retrieved 13 June 2011.
  24. ↑ "2010 Korean Baduk League". igokisen.web.fc2.com. Retrieved 13 June 2011.
  25. ↑ "2011 Korean Baduk League". igokisen.web.fc2.com. Retrieved 13 June 2011.
  26. ↑ "2007 Chinese A League". igokisen.web.fc2.com. Retrieved 13 June 2011.
  27. ↑ "2008 Chinese A League". igokisen.web.fc2.com. Retrieved 13 June 2011.
  28. ↑ "2009 Chinese A League". igokisen.web.fc2.com. Retrieved 13 June 2011.

External links

On YouTube


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