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66th Honinbo

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The 66th Honinbo began league play on 7 October 2010 and completed on July 21, 2011. Title holder Yamashita Keigo retained his title over challenger Hane Naoki by a score of 4-3. Yamashita Keigo won the first three games, Hane Naoki the next three, and Yamashita Keigo the final game.[1]

Preliminary tournament

The preliminary tournament started on 8 April 2010. Hane Naoki, Iyama Yuta, Takao Shinji, and Cho U retained their place in the Honinbo league from the 65th Honinbo. These players were joined by the winners of the preliminary tournament: Cho Sonjin, Seto Taiki, O Rissei, and Kobayashi Satoru.

 
Quarter-finalsSemi-finalsFinal
 
          
 
13 May
 
 
Yamashiro Hiroshi1
 
17 June
 
Fujita Akihiko0
 
Yamashiro Hiroshi1
 
27 May
 
Takashima Takeshi0
 
Goto Shungo0
 
12 August
 
Takashima Takeshi1
 
Yamashiro Hiroshi0
 
20 May
 
Cho Sonjin1
 
Ohashi Hirofumi0
 
1 July
 
Uchida Shuhei1
 
Uchida Shuhei0
 
27 May
 
Cho Sonjin1
 
Cho Sonjin1
 
 
Yamada Kimio0
 
 
Quarter-finalsSemi-finalsFinal
 
          
 
13 May
 
 
Hoshino Masaki0
 
10 June
 
Kataoka Satoshi1
 
Kataoka Satoshi1
 
13 May
 
Obuchi Morito0
 
Obuchi Morito1
 
29 July
 
Yasuda Yasutoshi0
 
Kataoka Satoshi0
 
13 May
 
Seto Taiki1
 
Yamada Noriyoshi0
 
24 June
 
Akiyama Jiro1
 
Akiyama Jiro0
 
27 May
 
Seto Taiki1
 
Seto Taiki1
 
 
Mimura Tomoyasu0
 
 
Quarter-finalsSemi-finalsFinal
 
          
 
13 May
 
 
Nakane Naoyuki0
 
24 June
 
Nakano Hironari1
 
Nakano Hironari0
 
3 June
 
Kono Rin1
 
Ogata Masaki0
 
2 September
 
Kono Rin1
 
Kono Rin0
 
20 May
 
O Rissei1
 
O Rissei1
 
15 July
 
Mochizuki Kenichi0
 
O Rissei1
 
27 May
 
Yuki Satoshi0
 
Kamimura Haruo0
 
 
Yuki Satoshi1
 
 
Quarter-finalsSemi-finalsFinal
 
          
 
22 April
 
 
O Meien0
 
10 June
 
Kobayashi Satoru1
 
Kobayashi Satoru1
 
13 May
 
Ishida Atsushi0
 
Shida Tatsuya0
 
19 August
 
Ishida Atsushi1
 
Kobayashi Satoru1
 
3 June
 
Suzuki Shinji0
 
Mizokami Tomochika0
 
24 June
 
Suzuki Shinji1
 
Suzuki Shinji1
 
13 May
 
Cho Chikun0
 
Cho Chikun1
 
 
Takemiya Masaki0
 

League play

League play commenced on 7 October after the preliminaries, which finished on 2 September. Hane Naoki, who lost the Honinbo title to Yamashita Keigo the year prior, won the right to challenge Keigo for the title.[1]

Player H.N. I.Y. T.S. C.U. O.R. K.S. C.S. S.T. Record Notes
Hane Naoki B+R W+R X W+0.5 B+R W+R B+R 6–1 Challenger
Iyama Yuta X B+R X X W+R B+R W+R 4–3
Takao Shinji X X B+1.5 X X W+R X 2–5 Eliminated
Cho U W+R B+0.5 X B+3.5 X B+R X 4–3
O Rissei X W+R B+R X X X B+R 3–4 Eliminated
Kobayashi Satoru X X W+2.5 B+4.5 W+R X X 3–4 Eliminated
Cho Sonjin X X X X B+R W+11.5 X 2–5 Eliminated
Seto Taiki X X W+R B+R X B+3.5 W+R 4–3

Finals

Player
1
2
3
4
5
6
7
T
Yamashita Keigo
(Honinbo)
W+7.5 B+R W+1.5 W+4.5 4
Hane Naoki
(Challenger)
W+0.5 B+R W+7.5 3

References

  1. ^ a b "66th Honinbo-sen". igokisen. Retrieved 21 July 2011.