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Shusaku Numbers

The Shusaku number of a go player is their distance from Honinbo Shusaku, when two players have distance 1 if they have played a game of go together. Some discussion is found at Sensei's Library.

This concept is modelled after that of Erdős number for mathematicians, their distance from Erdős when two mathematicians have distance 1 if they have a joint publication. The Sensei's Library page also mentions the Erdős go number. I (aeb) have Erdős number 2 and Erdős go number 1, but no kifu to prove it.

Usually it is easy to prove that two mathematicians have a joint paper, but it is not so clear how one should prove that two people played go together at some point in time, especially when these people need not be pros. For the present page my criterion was that I have seen a game record (kifu, SGF).

Paths on the Sensei's Library page

From Sensei's Lib and other web sources one finds the tree

Paths derived from the present collection of SGFs

Below an automatically generated list with (upper bounds for) Shusaku numbers of various players. The links are to SGFs that prove the claimed Shusaku number. The current directory contains about thirty games, mostly from GoGoD, that help to decrease some value. Players who only have connections via games played before 1800 were not listed.

Making the list is straightforward in principle, but there are things to watch out for. If two players both play Anonymous, or a go program like Many Faces of Go, they do not get distance two. Names like Hayashi Monnyu or Nakagawa Kamesaburo do not uniquely identify the player. On the other hand, many players have several names. No doubt there will be further problems.

Shusaku number 0

Shusaku

Shusaku number 1

Arai Chujiro Fujita Hosaku Hattori Seitetsu Hayashi Hakuei Hayashi Yubi Higuchi Tetsuzo Honinbo Josaku Honinbo Jowa Honinbo Shuho Honinbo Shuwa Hori Risaburo Hosenji Hoshin Imai Hanshichi Inoue Gennan Inseki Inoue Matsumoto Inseki Inoue Setsuzan Inseki Ishikawa Otojiro Itagaki Chuzo Ito Showa Ito Tokubee Itsumei Kikyaku Iwasaki Kenzo Kajikawa Shurei Kato Ryuwa Katsuta Eisuke Kimura Genboku Kishimoto Saichiro Kuroda Shunsetsu Mikami Gozan Mitamura Kisaburo Mitsui Kumasaburo Miyazawa Kichitaro Mizutani Nuiji Morimoto Ikuemon Mukai Shoso Muramatsu Shunsho Nakagawa Junsetsu Nakagawa Kamesaburo I Nakamura Mataki Narabayashi Kurakichi Ninomiya Shukai Ogura Takami Onizuka Genji Onkeiji Ota Yuzo Ozawa Mitsugoro Sakaguchi Sentoku II Sakaguchi Shintaro Sakata Shunosuke Sanai Tokujiro Sato Unji Sekiyama Sendayu Shiraki Sukeemon Soya Seijuro Sugiyama Senwa Takayama Sanjiro Takegawa Yasaburo Tsuruoka Saburosuke Udono Tokuzo Wada Kintaro Yamamoto Kinnosuke Yamamoto Samutsu Yamana Zushonosuke Yamazaki Sotosaburo Yasuda Kinzaburo Yasui Sanchi IX Yoshihara Bunnosuke

Shusaku number 2

Akaboshi Intetsu Akai Gorosaku Fukui Hanjiro Furusawa Kosai Furuya Okisaburo Godo Kichijiro Hattori Inshuku Hattori Yusetsu Hayashi Genbi Hayashi Sano Hayashi Shuei Hayashi Tetsugen Higuchi Kenryo Hiki Genjiro Hirose Heijiro Honinbo Genjo Honinbo Retsugen Honinbo Shuei Honinbo Shuetsu Horie Matagoro Ikuta Shoshu Imai Kinemon Inagaki Kanetaro Inoue Ansetsu Inoue Insa Inseki Ishihara Zezan Ishikawa Shingoemon Ito Daizaburo Ito Genzaburo Ito Hachisaburo Ito Shusuke Ito Yasujiro Karigane Junichi Katayama Chiteki Kato Kosaburo Kawakita Konosuke Kawase Takanosuke Kishi Ryuko Kita Fumiko Kobayashi Kentaro Kobayashi Tetsujiro Koike Kisohachi Kozu Hakuta Matsubara Nanko Miyoshi Kitoku Mizutani Takujun Mizutani Takuren Nagao Kinzaburo Nagasaka Inosuke Nakagawa Senji Nakamura Shohei Nakane Hojiro Nomura Suetomo Nonomura Sahee Okada Tanomo Okunuki Chisaku Osawa Ginjiro Ozaki Chuji Saito Tetsunosuke Sakaguchi Torajiro Sakai Yasujiro Sakuma Kunisaburo Sakurai Chitatsu Sannohe Yoshiaki Sano Tsunejiro Sase Hanzo Sato Genjiro Seki Genkichi Shinomiya Yonezo Shusai Suzuki Josei Tahara Tsunesaburo Takahashi Kinesaburo Takahashi Shutoku Takasaki Taisaku Takasugi Heima Toyama Sansetsu Tsuchiya Momosaburo Tsuchiya Shuetsu Uchigaki Suekichi Umezu Choko Wakasugi Zensaku Yahata Shonosuke Yamamoto Genkichi Yamamoto Tokuji Yamazaki Insa Yasui Chitoku Yasui Sanei Yasui Senchi Senkaku Yasui Shuntetsu Yoshida Hanjuro

Shusaku number 3

Abe Kamejiro Duan Qirui Felix Dueball Fujimura Yoshikatsu Fujisawa Hosai Fujisawa Shuko Fujita Toyojiro Fukuda Masayoshi Fukuhara Yoshitora Go Seigen Gu Sihao Hasegawa Akira Hashimoto Utaro Hayashi Monetsu Hayashi Tokuzo Hayashi Yutaro Honinbo Shugen Iida Haruji Ikegami Kiyoshi Inoue Inseki (14th Inoue) Inoue Inseki (15th Inoue) Inoue Inseki (16th Inoue) Inoue Intatsu Inseki Inoue Kohei Inoue Shunsaku Inseki Inoue Yasunobu Ito Genjiro Ito Kino Ito Kinoko Ito Kiyoko Ito Kotaro Ito Shigeko Ito Tomoe Iwamoto Kaoru Iwasa Kei Iwase Junichi Izumi Kiichiro Izumi Yohee Kadono Matsunosuke Kajiwara Takeo Kanai Shigeru Kanbara Shigeji Karibe Eisaburo Kariya Kazuo Kase Otojiro Kato Kagetaka Kato Shin Kawai Kikuji Kihara Kametaro Kikuchi Yasuro Kim Okkyun Kimura Hirozo Kimura Ushisaburo Kitani Minoru Kogishi Soji Kohara Kitaro Komori Teijiro Kondo Yoneo Kosugi Tei Kubomatsu Katsukiyo Kuroda Yukio Masubuchi Tatsuko Mito Yoshiaki Miyasaka Shinji Miyashita Shuyo Miyauchi Koyaro Mizutani Yotsuya Mukai Kazuo Murashima Yoshinori Murata Masahiro Murata Seiko Nagano Keijiro Nakagawa Kamesaburo II Nakagawa Shinji Nakamura Yutaro Nakano Chitoku (Yasui Senchi) Nakayama Zenkichi Narabayashi Seikichi Nashimoto Tetsu Nozawa Chikucho Okada Kihachiro Okada Ryukichi Onoda Chiyotaro Sakaguchi Tsunejiro Sakata Eio Segawa Yoshio Segoe Kensaku Seki Yasubei (or Genjiro) Sekiymama Sendayu Seo Hiroshi Seo Hisashi Shikama Chiyoji Shimamura Toshihiro Shinohara Masami Sometani Kazuo Sugioka Eijiro Sugiyama Hiroo Suzuki Tamejiro Tabata Sonbu Tabuchi Sonbu Tabuchi Yonezo Takabe Dohei Takagawa Shukaku Takahashi Seichi Takai Torasaburo Takeda Itsuko Takenaka Kotaro Takeuchi Kotaro Tamura Kahei Tanaka Fujio Tanaka Masaki Tasaka Jintaro Tomita Tadao Tsuya Moriitsuro Tsuyamori Itsuro Tsuzuki Senko Tsuzuki Senshi Tsuzuki Yoneko Ueda Kazuo Watanabe Hideo Watanabe Shokichi Xiao Qinwang Yamaguchi Sanseki Yasuda Kiyoshi Yasui San'ei Yasunaga Hajime Yoshida Misako

Shusaku number 4

Abe Hiroyuki Abe Yoshiteru Akagi Kazuo Akedo Kazumi Akimoto Shinji Akiyama Jiro Amano Masafumi Amayake Nobuo An Choyeong Ando Akio Aoki Kazuo Aoki Kikuyo Aoki Shinichi Aoyagi Hideo Aragaki Takeshi Araki Masuo Asano Hideaki Ashiba Katsumi Awaji Shuzo Baba Shigeru Bi Xingrui Cao Dayuan Cao Zhilin Chen Linxin Chen Zhigang Chen Zude Chin Kaei Chino Tadahiko Cho Chikun Cho Hunhyun Cho Rosho Cho Shoen Cho Sonjin Cui Yunzhi Doi Makoto Emanuel Lasker Enda Hideki Endo Takahiro Ezaki Masanori Ezura Yuichi Frank Janssen Friedrich Lenz Fujiki Hitomi Fukuda Yasuo Fukui Masaaki Fukui Susumu Gaku Yuzuru Gert Schnider Goto Shoji Goto Shungo Guenther Cieszow Guo Juan Guo Tisheng Habu Shozo Hachiuma Tadasu Hagiwara Sachiko Hamada Moriya Hamajima Hisayoshi Hamanaka Takamitsu Hanawa Yasutoki Handa Dogen Hane Naoki Hane Yasumasa Han Sang-ryong Harada Minoru Haruyama Isamu Hasegawa Sunao Hashimoto Shoji Hashimoto Yoshimi Hashimoto Yujiro Hayase Gendo Hayase Hiroshi Hidaka Toshiyuki Hikosaka Naoto Hiramoto Yasei Hirano Masaaki Hirata Hironori Hiroe Hiroyuki Hiroe Katsuhiko Hisai Keishi Hisajima Kunio Honda Kunihisa Honda Sachiko Hong Malk-eunsaem Honma Akio Hori Kentaro Horimoto Mitsunari Hoshino Toshi Hosokawa Senjin Hua I-kang Huang Dexun Huang Shuisheng Huang Yongji Hua Yigang Ida Isaburo Ide Yaojiro Ieda Ryuji Ieda Sosui Iguchi Toyohide Iino Seiho Ikeda Toshio Imamura Fumiaki Imamura Toshiya Imamura Yoshiaki Inagaki Koichi Inagaki Nissho Inoue Ichiro Inoue Kunio Ishibashi Chinami Ishida Akira Ishida Atsushi Ishida Yoshio Ishige Kakuo Ishigure Ikuro Ishii Kunio Ishii Mamoru Ishii Shinzo? Ishii Shinzo Ishikura Noboru Isogawa Masao Itasaka Usaburo Ito Hiroshi Ito Hitoshi Ito Katsuko Ito Makoto Ito Naoki Ito Sotozo Ito Yoji Iwaki Kimimasa Iwata Hajime Iwata Tatsuaki Iyomoto Momoichi Izumi Minoru Izumitani Hideo Izumitani Masanori Izumo Eiji Izutani Minoru Jiang Mingjiu Ji Zhiting John Bauer Juergen Mattern Kada Katsuji Kado Hayato Kageyama Toshiro Kaji Kazutame Kaku Kyushin Kamimura Haruo Kamimura Kunio Kamo Reiji Kanagawa Masaaki Kanai Shinichi Kanashima Tadashi Kanda Ei Kaneda Tokujiro Kanno Kiyonori Kano Kazuo Kano Yoshinori Karakida Noritsugu Kariya Hiraku Kasai Koji Kataoka Satoshi Kato Masao Kawabata Yasunari Kawai Tetsuyuki Kawakami Hideo Kawamoto Noboru Kawamoto Toshio Kawamura Kazunori Kawamura Masamichi Kim Heui-sun Kimura Yoshio Kishimoto Kazuo Kitamura Hiroshi Kitani Toshimi Kiyonari Tetsuya Kobayashi Chizu Kobayashi Izumi Kobayashi Kenji Kobayashi Koichi Kobayashi Masahiro Kobayashi Reiko Kobayashi Satoru Kodama Kunio Kodama Sachiko Koga Yoshio Koizumi Shigeo Kojima Shunichi Kojima Takaho Komatsu Fujio Komatsu Hideki Komatsu Nobuaki Ko Mosei Kong Xiangming Konishi Taizo Kori Toshio Kosakada Koji Kosugi Kiyoshi Kosugi Masaru Koyama Shizuo Koyama Yasuo Kubo Katsuaki Kubouchi Hideaki Kubouchi Shuchi Kudo Norio Kurosawa Tadanao Kusaka Kaneo Kusunoki Teruko Kuwahara Munehisa Kuwata Yasuaki Lee Changho Lei Puhua Liu Changhua Liu Dihuai Liu Qianli Liu Xiaoguang Luo Jianwen Luo Xihe Maeda Nobuaki Maeda Ryoji Maetani Shingo Magari Reiki Mashiko Fumihiko Matsubayashi Yoshihiko Matsuda Takeo Matsumoto Tokuji Matsuoka Teruo Matsuura Katsuji Matsuura Yoshihiro Ma Xiaochun Michael Redmond Mihara Osamu Mimura Tomoyasu Minami Yoshimi Mitsuhara Itaro Miwa Yoshiro Miyamoto Naoki Miyamoto Yoshihisa Miyazaki Hiroshi Miyazawa Goro Mizuno Hiroshi Mizuno Ichiro Mizuta Yoshihiro Morikawa Masao Morisaki Shigeharu Morishima Kaoru Morita Michihiro Moriyama Naoki Murai Sakae Murakami Bunsho Muramatsu Ryuichi Muramatsu Shofu Muraoka Shigeyuki Nabeshima Akira Nabeshima Ichiro Nagahara Yoshiaki Naganuma Makoto Nakamura Hidehito Nakanishi Bungoemon Nakano Hironari Nakao Jungo Nakaoka Jiro Nakaonoda Tomomi Nakayama Noriyuki Nakayama Suemaro Nakazono Seizo Namiki Keiichi Narumi Naoshi Narusawa Yasuichi Nie Weiping Nishigami Yoshihiko Nishimura Keiji Nishimura Osamu Nishizawa Katsuaki Nobuta Shigehito Noda Koji Noguchi Hitoshi Obuchi Morito Oeda Yusuke Ogaki Yusaku Ogata Masaki Ogawa Tomoko Ogoshi Ichiro Ohashi Toshio Ohira Shuzo Okabe Hiroaki Oka Mitsuo Oka Nobumitsu Okatani Mitsuo Okubo Ichigen Okumura Hideo O Meien Onda Yasuhiko Ono Nobuyuki Ono Yutaka O Rissei Osawa Tokutaro Otake Hideo Ota Kozo Otani Motohiro Ota Seido Oto Shozo Oya Koichi Oyama Ichiro Oyama Kunio Oyama Toshiko Ozaki Harumi Pu Zhongye Qian Yuping Qiu Xin Qi Zengju Rin Kaiho Robert Ryder Ronald Schlemper Ryu Shikun Saijo Masataka Saito Matsuko Sakaguchi Ryuzo Sakai Isao Sakai Masanori Sakai Michiharu Sakai Takeshi Sakai Toshio Sakakibara Shoji Sakamaki Kosuke Sanno Hirotaka Sasaki Takeo Sato Kaoru Sato Machiko Sato Masaharu Sato Sunao Sato Tadayoshi Sato Toshio Sato Tsunezo Sekine Naohisa Sekiyama Riichi Sekiyama Toshio Seo Bongsoo Shao Weigang Shen Guosun Shen Junqian Shimohira Akio Shimoji Genchu Shinkai Hiroko Shioiri Itsuzo Shirae Haruhiko Shiraishi Yutaka Shiratori Sumiko Shoji Kazuko So Kofuku Sonoda Yasutaka Sonoda Yuichi Sugiuchi Kazuko Sugiuchi Masao Sugiura Raita Su Kaiseki Sumino Tsunehiro Suzuki Etsuo Suzuki Goro Suzuki Hideko Suzuki Isao Suzuki Keizo Suzuki Masaharu Suzuki Taizo Suzuki Takeo Suzuki Tsuna Tainaka Shin Takada Toshio Takagi Shoichi Takahara Shuji Takahashi Toshimitsu Takamizawa Tadao Takanashi Seiken Takeda Hakuai Takeda Misawo Takemiya Masaki Takeuchi Sumio Takeuchi Takeo Tamura Minoru Tamura Noboru Tanaka Chieko Tanaka Minaichi Taniguchi Toshinori Tanimiya Teiji Tanimura Kuniko Tei Meiko Terada Kenichi Thomas Yamamoto T. Ishikawa Tokimoto Hajime Tokugawa Musei Tono Hiroaki Tono Masaharu Toriki Hiroshi Toyoda Hiroo Toyoshima Yoshio Tozawa Akinobu Tsubouchi Seikan Tsubouchi Tetsuzo Tsuchida Masamitsu Tsuchiya Hanshichi Tsujii Ryotaro Tsuji Tadashi Tsukakoshi Tsuneyasu Tsushima Juichi Tsutsui Katsumi Udagawa Koichi Uemura Shiro Umeda Haruhiko Umeki Suguru Unno Kenzo Ushikubo Yoshitaka Ushinohama Satsuo Victor Guang Chow Wang Jianhong Wang Runan Wang Youchen Wang Yunfeng Wang Zhenxiong Watanabe Reiji Watanabe Ryosaku Wei Haihong Wu Songsheng Xie Guoquan Xue Huidong Xu Rongxin Yamabe Toshiro Yamada Kozo Yamada Wakio Yamaguchi Shigeharu Yamamoto Masato Yamamoto Okiharu Yamamoto Yutaka Yamanashi Masaharu Yamashiro Hiroshi Yamashita Keigo Yamashita Yorimoto Yamazaki Masuo Yamazaki Nobu Yang Hui Yang Jinhua Yasuda Yasutoshi Yoda Norimoto Yo Kaei Yo Kagen Yokota Shigeaki Yokoyama Koichi Yokoyama Kunitada Yoshida Yoichi Yoshimatsu Shizuko Yoshino Shigeo Yu Bin Yukawa Mitsuhisa Yuki Satoshi Yun Heui-yul Zhang Danru Zhang Hengfu Zhang Liyuan Zhang Wendong Zhang Xuan Zhao Zhihua