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.
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Quarter-finals |
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Semi-finals |
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Final |
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13 May |
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Yamashiro Hiroshi |
1 |
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17 June |
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Fujita Akihiko |
0 |
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Yamashiro Hiroshi |
1 |
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27 May |
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Takashima Takeshi |
0 |
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Goto Shungo |
0 |
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12 August |
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Takashima Takeshi |
1 |
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Yamashiro Hiroshi |
0 |
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20 May |
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Cho Sonjin |
1 |
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Ohashi Hirofumi |
0 |
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1 July |
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Uchida Shuhei |
1 |
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Uchida Shuhei |
0 |
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27 May |
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Cho Sonjin |
1 |
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Cho Sonjin |
1 |
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Yamada Kimio |
0 |
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Quarter-finals |
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Semi-finals |
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Final |
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13 May |
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Hoshino Masaki |
0 |
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10 June |
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Kataoka Satoshi |
1 |
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Kataoka Satoshi |
1 |
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13 May |
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Obuchi Morito |
0 |
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Obuchi Morito |
1 |
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29 July |
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Yasuda Yasutoshi |
0 |
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Kataoka Satoshi |
0 |
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13 May |
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Seto Taiki |
1 |
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Yamada Noriyoshi |
0 |
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24 June |
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Akiyama Jiro |
1 |
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Akiyama Jiro |
0 |
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27 May |
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Seto Taiki |
1 |
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Seto Taiki |
1 |
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Mimura Tomoyasu |
0 |
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Quarter-finals |
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Semi-finals |
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Final |
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13 May |
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Nakane Naoyuki |
0 |
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24 June |
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Nakano Hironari |
1 |
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Nakano Hironari |
0 |
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3 June |
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Kono Rin |
1 |
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Ogata Masaki |
0 |
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2 September |
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Kono Rin |
1 |
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Kono Rin |
0 |
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20 May |
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O Rissei |
1 |
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O Rissei |
1 |
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15 July |
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Mochizuki Kenichi |
0 |
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O Rissei |
1 |
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27 May |
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Yuki Satoshi |
0 |
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Kamimura Haruo |
0 |
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Yuki Satoshi |
1 |
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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 |
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| 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
References
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| | International | |
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| | Continental | |
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| | China | |
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| | Japan | |
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| | Korea | |
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| | Taiwan |
- Qiwang
- Tianyuan
- Wangzuo
- Guoshou
- Haifong Cup
- Qisheng
- Zhonghuan Cup
- Aixin Cup
- Donggang Cup
- Siyuan Cup
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