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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 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 Akimoto Shinji Akiyama Jiro Amayake Nobuo An Choyeong Aoki Kazuo Aoki Kikuyo Aoki Shinichi Aoyagi Hideo Aragaki Takeshi Araki Masuo Awaji Shuzo Baba Shigeru Bi Xingrui Cao Dayuan Chen Linxin Chen Zude Chin Kaei Chino Tadahiko Cho Chikun Cho Hunhyun Cho Rosho Cui Yunzhi Emanuel Lasker Enda Hideki Endo Takahiro Ezaki Masanori Ezura Yuichi Frank Janssen Friedrich Lenz Fujiki Hitomi Fukuda Yasuo Fukui Masaaki Fukui Susumu Gert Schnider Goto Shungo Guo Tisheng Habu Shozo Hachiuma Tadasu Hagiwara Sachiko Hamajima Hisayoshi Hamanaka Takamitsu Handa Dogen Hane Naoki Hane Yasumasa Han Sang-ryong Harada Minoru Haruyama Isamu Hasegawa Sunao Hashimoto Shoji Hashimoto Yoshimi Hayase Gendo Hayase Hiroshi Hikosaka Naoto Hirata Hironori 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 Shuisheng Huang Yongji Hua Yigang Ida Isaburo Ieda Ryuji Ieda Sosui Iino Seiho Ikeda Toshio Imamura Fumiaki Imamura Toshiya Inagaki Koichi Inagaki Nissho Inoue Ichiro Ishibashi Chinami Ishida Akira Ishida Atsushi Ishida Yoshio Ishige Kakuo Ishigure Ikuro Ishii Kunio Ishii Mamoru Ishii Shinzo Isogawa Masao Itasaka Usaburo Ito Hiroshi Ito Hitoshi Ito Makoto Ito Naoki Ito Sotozo Ito Tomoe Iwaki Kimimasa Iwata Tatsuaki Iyomoto Momoichi Izumi Minoru Izumitani Hideo Izumo Eiji Izutani Minoru Ji Zhiting John Bauer Juergen Mattern Kada Katsuji Kado Hayato Kageyama Toshiro Kaji Kazutame Kaku Kyushin Kamimura Haruo Kamimura Kunio Kamo Reiji Kanashima Tadashi Kanda Ei Kaneda Tokujiro Kanno Kiyonori Kano Yoshinori Karakida Noritsugu Kariya Hiraku 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 Kiyonari Tetsuya Kobayashi Chizu Kobayashi Koichi Kobayashi Masahiro Kobayashi Reiko Kobayashi Satoru Kodama Kunio Kodama Sachiko Koga Yoshio Koizumi Shigeo Kojima Shunichi Kojima Takaho Komatsu Hideki Komatsu Nobuaki Ko Mosei Kori Toshio Kosakada Koji Kosugi Kiyoshi Kosugi Masaru Koyama Shizuo Koyama Yasuo Kubo Katsuaki Kubouchi Shuchi Kudo Norio Kurosawa Tadanao Kusaka Kaneo Kusunoki Teruko Kuwahara Munehisa Lee Changho Lei Puhua Liu Changhua Liu Dihuai Liu Xiaoguang Luo Jianwen Maeda Nobuaki Maeda Ryoji 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 Mizuta Yoshihiro Morikawa Masao Morisaki Shigeharu Morishima Kaoru Morita Michihiro Moriyama Naoki Murai Sakae Murakami Bunsho Muramatsu Shofu Nabeshima Akira Nabeshima Ichiro Nagahara Yoshiaki Naganuma Makoto Nakamura Hidehito Nakanishi Bungoemon Nakano Hironari Nakao Jungo Nakaoka Jiro Nakayama Noriyuki Nakayama Suemaro Nakazono Seizo Namiki Keiichi Narumi Naoshi Narusawa Yasuichi Nie Weiping Nishigami Yoshihiko Nishimura Osamu Noda Koji Noguchi Hitoshi Oeda Yusuke Ogata Masaki Ogawa Tomoko Ogoshi Ichiro Ohashi Toshio Ohira Shuzo Okabe Hiroaki Okatani Mitsuo Okubo Ichigen Okumura Hideo O Meien Onda Yasuhiko Ono Nobuyuki O Rissei Osawa Tokutaro Otake Hideo Ota Kozo Otani Motohiro Ota Seido Oya Koichi Oyama Ichiro Oyama Kunio Oyama Toshiko Ozaki Harumi Pu Zhongye Qian Yuping Qi Zengju Rin Kaiho Robert Ryder Ronald Schlemper Ryu Shikun Saijo Masataka Saito Matsuko Sakai Michiharu Sakai Takeshi Sakai Toshio Sakakibara Shoji Sanno Hirotaka Sasaki Takeo Sato Kaoru Sato Masaharu Sato Sunao Sato Tadayoshi Sato Toshio Sato Tsunezo Sekine Naohisa Sekiyama Riichi Sekiyama Toshio Seo Bongsoo Shen Guosun Shen Junqian Shimohira Akio Shimoji Genchu Shinkai Hiroko Shioiri Itsuzo Shirae Haruhiko Shiraishi Yutaka Shiratori Sumiko Shoji Kazuko 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 Tamura Minoru Tamura Noboru Tanaka Minaichi Tanimiya Teiji Tanimura Kuniko Tei Meiko Terada Kenichi Thomas Yamamoto T. Ishikawa Tokimoto Hajime Tokugawa Musei Tono Hiroaki Tono Masaharu 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 Umeda Haruhiko Unno Kenzo Ushikubo Yoshitaka Ushinohama Satsuo Victor Guang Chow Wang Jianhong Wang Runan Wang Youchen Wang Yunfeng Watanabe Reiji Watanabe Ryosaku Wu Songsheng Xie Guoquan Yamabe Toshiro Yamada Kozo Yamada Wakio Yamaguchi Shigeharu Yamamoto Okiharu Yamamoto Yutaka Yamanashi Masaharu Yamashiro Hiroshi Yamashita Keigo Yamazaki Masuo Yamazaki Nobu 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 Zhao Zhihua