- O-kage Cup see Gratitude Cup
- O Keii
- 1-dan promotion 114: 8
- O Meien
- 900 wins, reaches 122: 9
- “1985 Move of the Year” 45: 18-19, 21-25*
- “Attacking the Two-Space Extension: Problems” 57: 45-57 c
- Daiwa Securities Cup Net Igo Open 2007, wins 111: 5, 6
- Honinbo and Meijin Leagues 1985-86, wins places in 41: 3
- Honinbo League 1999-2000, wins 89: 8, 39
- Honinbo Title Match 2000, defeats Cho Sonjin in 89: 7-8*
- Honinbo Title Match 2001, defeats Cho U in 92: 6-7*; 93: 29
- Honinbo Title Match 2002, loses to Kato Masao in 95: 8-10*
- “An Interview with O Meien” (Sano Shin) 93: 33-34*
- NEC Shun’ei Tournament 1991, wins 63: 8
- Oza Title Match 2002, defeats Cho Chikun in 96: 6; 97: 6*, 7
- ST & Fuma-kira Igo Masters Cup 2012, wins 128: 9
- “Why Not Eliminate the Irrational in Go?” (discussion with Kudo Norio and
- Murakami Akira) 45: 60-64*
- O Meien vs. Cho Chikun
- Meijin League 1985-86 (fuseki only) 45: 19, 24-25
- O Meien vs. Cho Sonjin
- Honinbo Title Match 2000 (Games 1-6) 89: 36-38*; 90: 43-53
- O Meien vs. Cho U
- Honinbo Title Match 2001 (Games 1, 2 & 7) 92: 13-23*; 93: 29-33
- O Meien vs. Kato Masao
- Honinbo Title Match 2002 (Games 1-6) 96: 41-74* c
- O Meien vs. Komatsu Hideki
- Shinjin-O Tournament 1985 45: 19, 23-24
- O Meien vs. Mimura Tomoyasu
- Honinbo League 2003-04 (sacrifice analysis) 114: 48-52
- O Meien vs. Pak Yeong-hun
- Fujitsu Cup 2002 (quarterfinal) 95: 14-17, 54
- O Meien vs. Song T’ae-kon
- Fujitsu Cup 2003 (Round 2) 98: 28-30*
- O Meien vs. Sugiuchi Masao
- Judan Tournament 1984-85 45: 18, 21-23*
- O Meien vs. Yi Ch’ang-ho
- Fujitsu Cup 1989 (Round 1) 55: 20-28*
- Nong Shim Cup 2004-05 (Shanghai Round) 105: 32-33
- O Meien + Xie Yimin
- Ricoh Cup 2011, win 125: 8
- O Rissei
- 900 wins, reaches 100: 9
- 1,000 wins, reaches 114: 7
- 1998 performance 83: 5; 84: 2
- best-of-seven matches, experience in 83: 4, 36
- biographical details 26: 38; 64: 11; 66: 9*
- Chunlan Cup Final 2000, defeats Ma Xiaochun in 89: 3-4*
- Fujitsu Cup Final 1992, loses to Otake Hideo in 68: 3
- Fujitsu Cup Final 1997, loses to Kobayashi Koichi in 80: 3; 81: 7-8*
- Honinbo League 1997-98, wins 82: 5; 84: 7
- Honinbo Title Match 1998, loses to Cho Chikun in 83: 4*
- Judan Title Match 1996, loses to Yoda Norimoto in 76: 2-3*; 77: 27
- Judan Title Match 2001, defeats Kobayashi Koichi in 91: 7*; 92: 5-6*
- Judan Title Match 2002, defeats Takemiya Masaki in 94: 9; 95: 8, 9*
- Judan Title Match 2003, defeats Takao Shinji in 98: 7-8*
- Judan Title Match 2004, wins 101: 6
- Judan Tournament 1995-96, O Rissei wins 76: 2
- Kakusei Title 1989, wins 56: 8-9*
- Kisei Title Match 2000, defeats Cho Chikun in 88: 6-7*
- Kisei Title Match 2001, defeats Cho Sonjin in 91: 6-7*
- Kisei Title Match 2002, defeats Ryu Shikun in 94: 6-7*
- Kisei Title Match 2003, loses to Yamashita Keigo in 97: 7-8*; 98: 6-7*
- Kisei Tournament 1999 play-off, defeats Hikosaka Naoto in 87: 6
- Kobayashi Koichi, 1997 performance against 81: 12-13
- LG Cup Final 1998, defeats Yu Ch’ang-hyeok in 82: 2; 83: 5
- Meijin League 1997-98, wins 83: 4, 36
- Meijin Title Match 1998, loses to Cho Chikun in 84: 2; 85: 23
- “New Moves and New Josekis. The Onadare Joseki: A Professional’s Vision of Hell”
- 81: 57-62
- NHK Cup 1997, wins 79: 8*
- Oza Title Match 1995, defeats Cho Chikun in 75: 2*; 76: 11
- Oza Title Match 1996, loses to Ryu Shikun in 78: 2
- Oza Title Match 1998, defeats Yamada Kimio in 84: 2-3*
- Oza Title Match 1999, defeats Cho Chikun in 88: 5-6*
- Oza Title Match 2000, defeats Cho Chikun in 91: 5
- Oza Title Match 2001, loses to Cho Chikun in 93: 6-7; 94: 5*, 6
- Shinjin-O Title Match 1981, wins 25: 4
- tesuji problems by 38: 52, 53, 55, 58
- titles won (as of 2002) 96: 31
- O Rissei vs. Cho Chikun
- Fujitsu Cup 1991 (semifinal) 66: 8-12*
- Honinbo Title Match 1998 (Games 1-6) 84: 6-35* c
- Kisei Title Match 2000 (Games 1-6) 88: 20-37*; 89: 32-36
- Meijin Title Match 1998 (Games 1-7) 85: 23-38*
- Meijin Title Match 1998 (fuseki analysis of Game 5) 84: 43-50
- Oza Title Match 1995 (Game 3) 76: 11-13
- O Rissei vs. Cho Hun-hyeon
- Fujitsu Cup 1991 (Round 2) 65: 11-14*
- LG Cup 1997-98 (quarterfinal) 81: 22-24
- LG Cup 2000-01 (quarterfinal) 91: 28-30
- O Rissei vs. Cho Sonjin
- Kisei Title Match 2001 (fuseki analysis of Game 3) 91: 56-63
- Kisei Title Match 2001 (Game 6) 92: 46-50
- O Rissei vs. Cho U
- Judan Title Match 2004 (Game 4) 103: 31-32*
- O Rissei vs. Hasegawa Sunao
- Shinjin-O Title Match 1981 (Game 1) 26: 39
- O Rissei vs. Ishida Akira
- Honinbo League 1998-99 (proper move analysis) 123: 58-59
- O Rissei vs. Kobayashi Koichi
- Fujitsu Cup Final 1997 81: 7-13* c
- Ing Cup 1988 (Round 1, fuseki only) 53: 25-26
- O Rissei vs. Liu Xiaoguang
- Fujitsu Cup 1991 (Round 1) 64: 11-17*
- O Rissei vs. Ogata Masaki
- IBM Haya-go Open Tournament 1988 (quarterfinal) 53: 21-22
- O Rissei vs. Otake Hideo
- Fujitsu Cup Final 1992 69: 40-44
- O Rissei vs. Rui Naiwei
- LG Cup 1997-98 (Round 2) 81: 17-22
- O Rissei vs. Ryu Shikun
- Kisei Title Match 2002 (Games 1-6) 94: 15-18; 95: 18-39, 44
- O Rissei vs. Takemiya Masaki
- Judan Title Match 2002 (Games 1-5) 96: 18-40*
- Oza Tournament 1982 (ladder analysis) 29: 61
- O Rissei vs. Yamada Kimio
- Honinbo League 1998-99 (joseki analysis) 104: 61
- O Rissei vs. Yamashita Keigo
- Kisei Title Match 2003 (Games 1-5) 98: 7*, 34-41, 50*, 58, 33; 99: 48-65
- O Rissei vs. Yoda Norimoto
- Judan Title Match 1996 (Game 4) 77: 27-29
- O Rissei vs. Yu Ch’ang-hyeok
- LG Cup Final 1998 (Games 1-5) 83: 5-12
- O-Senchi see Senchi Senkaku
- Oba see Big points
- Obituaries
- see also Memorials
- Abe Yoshiteru 120: 9-10*
- Asada Shizuo 78: 4
- Castledine, Brian (by Chandler) 13: 4
- Chen Zude 129: 10
- Cho Nam-ch’eol 108: 9*
- Fujisawa Hosai 68: 48
- Fujisawa Shuko 119: 9
- Fujita Goro 70: 11
- Hasegawa Kayoko 111: 7
- Hashimoto Shoji 121: 10*
- Hashimoto Utaro 71: 5-6*
- Hayase Hiroshi 129: 10
- Hayashi Yutaro 31: 63
- Hisai Keishi 88: 11
- Hisajima Kunio 107: 8*
- Hoshino Toshi 63: 7
- Ishibashi Chinami 128: 10
- Ishige Kakuo 100: 10
- Iwamoto Kaoru 87: 14
- Kageyama Toshiro 60: 7
- Kaji Kazutame 89: 58
- Kajiwara Takeo 121: 9-10*
- Kano Yoshinori 85: 51
- Kato Masao 103: 8
- Kitamura Yoji 122: 10
- Kitani Miharu 64: 7, 51
- “Kobayashi Reiko 6-dan (1939-96)” 77: 6-8*
- Kodama Kunio 94: 12
- Konishi Taizo 125: 10-11
- Koyama Yasuo 90: 27; 91: 12
- Liu Jun 101: 12
- Mashiko Fumihiko 125: 11; 126: 10; 128: 64
- Minami Yoshimi 126: 10
- Miwa Yoshiro 70: 12
- Miyamoto Naoki 129: 10
- Morikawa Masao 108: 8
- Murashima Yoshinori 31: 63
- Naganuma Makoto 102: 10
- Nakaoka Jiro 101: 9
- Nakayama Noriyuki 122: 10
- Oeda Yusuke 123: 8-9
- Ohira Shuzo 84: 4
- Okuma Chikuko 125: 10
- Oyama Toshiko 129: 10
- Ozaki Harumi 125: 11
- Pietsch, Hans 97: 10-11*
- “Pinckard, William, In Memoriam: ” (Power) 56: 9, 18
- Sakakibara Shoji 115: 9
- Sakata Eio 124: 9-10
- Sato Sunao 102: 10
- Sekine Naohisa 108: 9
- Shimada Yoshikuni 126: 10
- Shimamura Toshihiro 64: 7*
- Shinohara Masami 46: 5-6*
- Takagawa Kaku 46: 5*
- Tomita Tadao 94: 12
- Tono Masaharu 120: 9; 124: 10; 128: 64
- Toriki Hisashi 125: 11
- Toshimitsu Matsuo 103: 8
- Watanabe Fumio 128: 10
- Watanabe Reiji 112: 8
- Williams, John E. 72: 7
- Wimmer, Manfred 74: 5
- Yamabe Toshiro 88: 11*
- Yamamoto Yutaka 124: 10
- Yasuda Kiyoshi 125: 11; 126: 10; 128: 64
- Yasunaga Hajime 70: 12*
- Yokoyama Kunitada 123: 9
- Yoshikuni Ichiro 126: 10
- Ochiai Yoshiiku (artist)
- Hana-zakari Kinki Shoga (tryptych, cover note) 109: 1
- Okumura Hachiemon (oban print, cover note) 117: 1
- “Odd Man Out” (Ogawa Tomoko; James Davies)
- [4 parts] (endgame problems) 17 ; 18 ; 20 ; 21: ...
- Odom, Gary
- “Invincible: The Games of Shusaku” (book review) 27: 36-38
- Oeda Yusuke (1935–2010)
- death of 123: 8-9
- Official British Go Association Song Book, The (T. Mark Hall, ed.)
- available (1989) 57: 32
- Ogata Gekko (artist)
- untitled print (cover note) 42: 1
- Ogata Masaki vs. O Rissei
- IBM Haya-go Open Tournament 1988 (quarterfinal) 53: 21-22
- Ogata Masaki vs. Takao Shinji
- Fujisawa Shuko’s Winter Training Camp 1991 66: 48
- Ogawa Doteki see Doteki
- Ogawa Tomoko
- 500 wins, reaches 115: 8
- 1986 career 49: 51
- biographical details 9: 6*
- profile 57: 4*
- Women’s Championship 1979, wins 13: 3
- Women’s Championship 1980, wins 19: 3
- Women’s Honinbo Title Match 1986, wins 46: 3*; 49: 51*
- Women’s Meijin Title Match 1997, loses to Nishida Terumi in 79: 8
- Ogawa Tomoko and James Davies
- “Odd Man Out” [4 parts] (endgame problems) 17 ; 18 ; 20 ; 21: ...
- Ogawa Tomoko vs. Kobayashi Chizu
- Women’s Championship 1978 (Games 1-3) 9: 5-11*
- Ogawa Tomoko vs. Kobayashi Reiko
- Women’s Kakusei Tournament 1995 (joseki analysis) 77: 30, 55
- Ogawa Tomoko vs. Kusunoki Teruko
- Women’s Honinbo Title Match 1986 (Games 1 & 2) 49: 52-55*
- Ogeima see Large knight’s move ...
- Ogeima-gakari see Large knight approach ...
- Ogeima-jimari see Large-knight’s-move enclosure
- Ogoshi Ichiro
- “My Secret Strategies for Handicap Games” 65: 52-55
- tesuji problem by 38: 53, 56
- Oguri Hangan (15th-century son of daimyo)
- Oguri Hangan on Horseback (cover note) 71: 1
- Ohira Shuzo (1930–98)
- biographical details 36: 32*
- death of 84: 4
- Kisei Tournament 1991, wins 9-dan section of 64: 6-7
- “Life-and-Death Problem” 42: 25, 48-49
- memory of 121: 46
- time, loses on 13: 61
- winning streak (1987) of 49: 4*
- Ohira Shuzo vs. Cha, Jimmy
- Fujitsu Cup 1989 (Round 2) 55: 15-17*
- Ohira Shuzo vs. Fujisawa Shuko
- Tengen Title Match 1975-76 (tesuji problem of Game 1) 99: 45, 46-47
- Ohira Shuzo vs. Go Seigen
- Meijin League 1963-64 (fuseki analysis) 5: 61
- Ohira Shuzo vs. Kobayashi Satoru
- IBM Haya-go Open Tournament 1990 (final) 62: 14-17*
- Ohira Shuzo vs. Liu Xiaoguang
- Japan-China Go Exchange 1984 (Round 1) 37: 44-45*
- Ohira Shuzo vs. Ma Xiaochun
- Japan-China Go Exchange 1982 (Round 2) 29: 12-13
- Ohira Shuzo vs. Rin Kaiho
- Kisei Tournament 1982-83 (Stage One, 9-dan final) 36: 31-33
- Ohira Shuzo vs. Sugiuchi Masao
- Gosei Preliminary Tournament 1983 35: 56
- Oi-otoshi
- problem and examples 73: 11, 56-57
- Oishi Sezaemon Nobukiyo (samurai)
- untitled print (cover note) 129: 1
- Ok Teuk-chin
- Wangwi Knockout Tournament 2005, wins 105: 10
- Okabe Hiromu
- becomes Chairman of Nihon Ki-in (2006) 108: 7
- Okada Yumiko
- see also her former name Abe Yumiko
- Women’s Strongest Player Title 2002, wins 97: 9
- Okada Yumiko + Yamada Kimio
- Ricoh Cup 2007, win 110: 8
- Okan Tournament (Crown)
- 2001 (42nd): Yamashiro Hiroshi wins 94: 10
- 2002 (43rd): Hane Naoki wins 97: 11
- 2003 (44th): Hane Naoki wins 100: 9
- 2004 (45th): Hane Naoki wins 103: 8
- 2005 (46th): Yamashiro Hiroshi wins 106: 6
- 2006 (47th): Matsuoka Hideki wins 110: 7-8*
- 2007 (48th): Hane Naoki wins 114: 7
- 2008 (49th): Hane Naoki wins 117: 10
- 2009 (50th): Hane Naoki wins 121: 6
- 2010 (51st): Yamashiro Hiroshi wins 124: 8, 9
- 2011 (52nd): Hane Naoki wins 127: 7
- 2012 (53rd): Hane Naoki wins 129: 8
- Oki see Placement
- Okinawa missions (Edo period) see Ryukyu missions
- Okinawa tournaments see CSK Cup , Igo Asia Cup
- Okubo Ichigen vs. Chen Zude
- Japan-China Go Exchange 1978 (Round 3) 10: 25-27*
- Okubo Koto (19th-century patron)
- touts around Iwasaki Kenzo 32: 61-62
- Okuda Aya
- Women’s Honinbo Tournament 2012, wins 129: 5
- Women’s Meijin League 2012-13, wins 129: 8
- Okuma Chikuko (1922–2011)
- death of 125: 10
- Okumura Hachiemon
- cover note 117: 1
- Okura Prizes
- 2002: awarded to Hikaru no Go creators 98: 9, 10
- 2004: recipients 103: 8
- Old tournaments see subentry discontinued under Chinese , International , Japanese ,
- Korean , Taiwanese tournaments
- Oldest game records
- Japanese (1253) 7: ibc, 53
- Oldest players
- see also Longest-serving professionals
- 102-year-old wins promotion 59: 56-57
- Oldest title-holders
- Fujisawa Shuko by winning Oza Title Match 1992 69: 8
- Shimamura Toshihiro by winning Tengen Title Match 1977 6: ifc*, 2
- Olleh KT Cup (Korea)
- founding of 122: 11
- 2010 (1st): Yi Se-tol wins (+ results) 124: 10
- 2011 (2nd): Yi Se-tol wins (+ results) 127: 9
- Omokuhazushi joseki see 6-3 point joseki
- Onadare joseki see Large avalanche
- Onda Yasuhiko
- biographical details 61: 64*
- “Life-and-Death Problems” 61: 64*, 67-68; 66: 49, 52
- One eye
- see also Nakade
- “One eye beats no eyes” (proverb) 73: 59, 51
- One group dies
- example 50: 20
- “One-Minute Life-and-Death Problems”
- (problems & answers) 117: 51, 58-59; 126: 44, 64
- “One-Minute Tesuji Problems”
- (problems & answers) 118: 56-59; 126: 53-54, 55-57
- “One Page Lesson: Endgame Technique” (Kudo Norio; Miwa Yoshiro)
- (counting) 27: 48-49; 28: 53-54
- “One Page Lesson: Semeai Tesuji” (Nakagawa Shinji)
- (problem) 28: 54
- “One-sided” games see under Unusual games
- One-space high approach (3-4 point joseki)
- see also Attach-and-draw back , Avalanche , Knight’s move , One-space low pincer ,
- One-space jump , Outside attachment , Two-space high pincer
- Chinese fuseki, variations in 13: 42-43; 14: 32-33; 15: 37
- “The Great Joseki Debate” (Honda Kunihisa) 17: 43-48
- One-space high approach and knight approach (4-4 point joseki)
- see Knight approach and one-space high approach
- One-space high pincer against knight approach (3-4 point joseki)
- “The Great Joseki Debate” (Honda Kunihisa) 26: 27-31
- sacrifice variation 115: 50
- One-space high pincer against knight approach (4-4 point joseki)
- appropriate example (analysis) of 6: 43-44; 7: 46-47
- One-space jump
- “Basic Fighting Techniques” (problems and examples by Miyazawa Goro)
- 18: 51-54*
- first-line (problems), to 55: 59*, 62-64
- getting out (example) 33: 36-37
- stepping back to defend (example) 69: 54
- One-space jump after knight approach (4-4 point joseki)
- contact play and hane, how to answer the (problem) 58: 52, 56
- “Correcting the Mistake” (Kato Masao) 13: 59-61
- “Match the Joseki to the Fuseki” (Sekiyama Toshio) 3: 31-36
- “New Moves and New Josekis: The Purpose of the Peep” (Abe Yoshiteru)
- 77: 30, 55
- problems 119: 61; 120: 57-58
- second approach move (analysis), pincer against 8: 39-40; 9: 38-41; 10: 41-44;
- 11: 37-39
- second approach move (problem and analysis), suberi from 11: 44-45
- “Trick Moves, Three” (problems by Abe Yoshiteru) 39: 40, 44-45; 40: 39, 42-43
- One-space jump after one-space high approach (3-4 point joseki)
- trick moves (problems) 43: 47, 53
- One-space low pincer against 3-4 approach (5-3 point joseki)
- “The Great Joseki Debate” (Honda Kunihisa) 30: 59-63
- “New Joseki” (Abe Yoshiteru) 7: 54-55
- One-space low pincer against knight approach (3-4 point joseki)
- “The Great Joseki Debate” (Honda Kunihisa) 42: 55-61; 48: 59-64
- tewari analysis of variation of 59: 62-63
- trick move (problem) 45: 40, 42
- One-space low pincer against knight approach (4-4 point joseki)
- appropriate example (analysis) of 5: 64-65; 6: 42-43
- forcing moves (analysis) 77: 48-51
- hane after 3-3 point invasion, how to defend against 69: 57
- “An Introduction to Basic Josekis”. Parts 4-6 85: 60-64; 86: 46-49; 87: 49-52
- “The Korean Style: Korean Joseki Innovations”. Part 4 (Oya Koichi) 100: 86-100
- post-joseki examples 77: 50; 93: 48-49
- problems 119: 61; 120: 57, 58
- sanrensei, variations in 10: 39-40
- “Unusual Joseki Variations” (Yo Kagen) 93: 46-47
- One-space low pincer against one-space high approach (3-4 point joseki)
- “After the Joseki: Early Middle Game Strategy” (Miyashita Shuyo) 31: 58-59
- atari, when to play 76: 49-50
- “The Great Joseki Debate” (Honda Kunihisa) 49: 59-ibc*
- “Joseki Amateurs Don’t Know” (Abe Yoshiteru) 16: 52-53
- magari as big follow-up move 70: 40-41
- problem (by Aoki Kikuyo and Nakamura Chikako) 120: 58-60
- relation to fuseki (discussion) 64: 57-58
- tewari analysis of variation of 59: 67-68
- trick move (problem) 92: 24, 52-53
- trick move variation 49: 64-ibc
- “Trick Moves, Three” (problems by Abe Yoshiteru) 44: 31-33
- Online games
- “Seen on the Net” [3 parts] (van Zeijst) 113: 48-52; 114: 44-47; 115: 56-60;
- 116: 56
- Online tournaments
- see also Daiwa Securities Cup Net Igo Ladies , Daiwa Securities Cup Net Igo Open ,
- Daiwa Securities Grand Champion Tournament , IGS “Super Fast Go” ,
- Internet World Open Tournament , Japan-China Cyberspace “5x5” Team Match
- automated tournament system on Kiseido Go Server 98: 42, 43-44
- Onna Kikaku Oteai 1907 (Women’s Go Tournament)
- results 64: 48
- Tsuzuki Yoneko vs. Takeda Itsuko 64: 47
- Onodera Toemon Hidetome (17th-century samurai)
- untitled print (cover note) 38: 1
- Open tournaments see individual tournaments
- Opening see Fuseki
- Organizations see Associations , Clubs , Foundations , Institutes
- Origin of go
- “Invention or Evolution?” (letter to the editor by Potter) 75: 9
- note on 42: 21
- sources for studying 37: 16-17
- “The Earth, the Dead and the Darkness: A Speculative Essay on the Creation of Go
- in Early China” (Shotwell) 70: 47-61; book ; web
- “Origin of the Avalanche Joseki, The” (Fujisawa Shuko)
- (extracts from Go Super Book 1) 34: 55-61
- “Original Handicap Strategy” (Miyamoto Naoki)
- [7 parts] 1 – 7: ...
- Original moves
- “Original Moves” (problems from actual games) 100: 75-85*
- Osae see Blocking move
- Osai Fusatane (artist)
- Portrait of the Floating World in Full Bloom (print, cover note) 39: 1
- Osawa Narumi
- JAL Women’s Lightning Go Tournament 2005, wins 104: 8
- Women’s Kakusei Tournament 1999, wins 87: 4
- Women’s Kakusei Tournament 2003, wins 97: 11
- Osawa Narumi + Cho Chikun
- Ricoh Cup 2008, win 114: 7
- Oshi-tsubushi
- “Basic Fighting Techniques” (problems and example by Miyazawa Goro)
- 39: 41, 45-46
- securing two eyes (problem and example) 78: 53, 56-57
- Oshima Masao
- “China: Spotlight on Youth” 109: 54-56
- “The Korean Go Boom” 86: 54-60
- Oshiro-go see Castle games
- Osram Korea Cup: New Stars Successive Wins Strongest Player Tournament
- 2003 (3rd): Song T’ae-kon wins 99: 10
- 2005 (5th): Kang Tong-yun wins 105: 10
- 2006 (6th): Pak Cheong-sang wins (+ results) 109: 9; 110: 8
- 2007 (7th): Kang Tong-yun wins (+ results) 113: 10
- Ota Seido vs. Endo Takahiro
- endgame exercise 10: 45-48
- Ota Seido vs. Mikawa Shinji
- endgame exercise 7: 49-53
- Ota Seido vs. Takama ?
- endgame exercise 10: 45-48
- Ota Seido vs. Uenishi ?
- endgame exercise 7: 49-53
- Ota Yuzo vs. Shusaku
- sanjubango 1853 (middle-game problem of Game 17) 15: 41, 42-43
- sanjubango 1853 (piano composition of Game 6) 49: 57; 63: 8
- Ota Yuzo vs. Shuwa
- undated games (middle-game problems) 1: 51...55; 2: 54-59; 3: 54...59;
- 5: 70...73; 6: 59...62; 8: 52...55
- Otake Hideo
- biographical details 19: 34*
- Chairman of Nihon Ki-in (2008), becomes 118: 9
- Cho Chikun, rivalry with 24: 39; 30: 16; 34: 33; 120: 8
- Cho Chikun in Meijin Title, rivalry with 34: 32; 39: 17
- Fujisawa Shuko, rivalry with 24: 50
- Fujitsu Cup Final 1992, defeats O Rissei in 68: 3
- Gosei award ceremony (1981) 34: 13*
- Gosei League 1978, wins 8: 2
- Gosei Title Match 1978, wins 9: 2; 10: 2*, 21
- Gosei Title Match 1980, wins 20: 2*, 3; 21: 2, 3
- Gosei Title Match 1981, wins 25: 2-3*
- Gosei Title Match 1982, wins 28: 2; 29: 2; 30: 15*
- Gosei Title Match 1983, wins 32: 4
- Gosei Title Match 1984, wins 36: 2; 39: 54
- Gosei Title Match 1985, defeats Kudo Norio in 40: 2; 44: 55
- Gosei Tournament 1980, wins 20: 2, 3
- Honinbo League 1987-88, wins 51: 3
- Honinbo Title Match 1988, loses to Takemiya Masaki in 52: 2*; 54: 37*
- IBM Haya-go Open Tournament 1989, wins 56: 4-5; 59: 39 c
- Ing Cup Final 1993, loses to Seo Pong-su in 69: 5*; 70: 13
- Judan Title Match 1980, wins 18: 2; 19: 2
- Judan Title Match 1981, wins 24: 2
- Judan Title Match 1993, wins 69: 10
- Judan Title Match 1994, defeats Kobayashi Koichi in 70: 8
- Judan Title Match 1995, loses to Yoda Norimoto in 73: 45
- Judan Tournament 1984-85, wins 41: 34
- Judan Tournament 1992-93, wins 69: 10
- Kakusei Title 1983, wins 31: 5
- Kakusei Title 1984, wins 34: 3
- Kato Masao, rivalry with 35: 33; 39: 55
- Kisei Title Match 1990, loses to Kobayashi Koichi in 58: 4-5; 60: 30*
- Kisei Tournament 1980 play-off, wins 22: 2
- Kitani Minoru, offers respects at grave of 16: ifc*
- Kobayashi Koichi, rivalry with 60: 30-31
- Meijin League 1977-78, wins 10: 2
- Meijin League 1983-84, wins 36: 2
- Meijin League 1991-92, wins 68: 5, 6
- Meijin League 1992-93, wins 69: 11, 12
- Meijin Title Match 1977, loses to Rin Kaiho in 5: ifc*, 5-6*
- Meijin Title Match 1978, wins 10: 2-3
- Meijin Title Match 1979, defeats Sakata Eio in 16: 2
- Meijin Title Match 1982, loses to Cho Chikun in 29: 2; 30: 58
- Meijin Title Match 1983, loses to Cho Chikun in 32: 4; 33: ifc*, 2; 35: 26
- Meijin Title Match 1984, loses to Cho Chikun in 36: 2, 5; 37: 2*; 39: 17, 39*, 40
- Meijin Title Match 1990, loses to Kobayashi Koichi in 61: 3-4; 62: 6, 39
- Meijin Title Match 1992, loses to Kobayashi Koichi in 68: 5-6; 69: 7-8
- Meijin Title Match 1993, loses to Kobayashi Koichi in 70: 6
- Oza Tournament 1983, wins 32: 4, 5
- Rin Kaiho, rivalry with 4: 2
- rivalries see subentries Cho , Fujisawa , Kato , Kobayashi , Rin , Sakata , Takemiya
- Sakata Eio, rivalry with 16: 17
- Shusaku memorial stone visited by 34: 39*
- style of 34: 32; 54: 37*
- suffers from a slipped disc (1982) 30: 20-21
- Takemiya Masaki, rivalry with 54: 37*
- TV Asia Tournament Final 1994, defeats Qian Yuping in 71: 2-3
- Otake Hideo vs. Awaji Shuzo
- Gosei Title Match 1983 (Games 1-5) 34: 12-30* c
- Otake Hideo vs. Cho Chikun
- Gosei Title Match 1979 (Games 1-3) 16: 5-11*
- Gosei Title Match 1980 (Games 1-4) 21: 3*; 22: 11-27*
- Gosei Title Match 1982 (Games 1-5) 30: 6-15*
- Gosei Title Match 1986 (Games 1-3) 47: 38-49*
- Gosei Title Match 1986 (tesuji problem of Game 1) 98: 45, 48
- Judan Title Match 1982 (Games 1-4) 29: 15-25
- Kisei Tournament 1980 (play-off, Games 1-3) 24: 39-49*
- Meijin League 1989-90 61: 6
- Meijin Title Match 1980 (Games 1-6) 22: ifc*, 29-41*; 23: 8-25*, 27*
- Meijin Title Match 1982 (Games 1-5) 30: 16-35*, 58
- Meijin Title Match 1983 (Games 1-5) 34: 32-45*; 35: 23-32*
- Meijin Title Match 1984 (Games 1-7) 39: 17-40*
- Otake Hideo vs. Cho Hun-hyeon
- Fujitsu Cup 1990 (Round 2) 60: 16-19*
- Otake Hideo vs. Fujisawa Shuko
- Kisei Title Match 1981 (Games 1-4) 23: ifc*; 24: 50-ibc c
- Kisei Title Match 1981 (proper move analysis of Game 4) 126: 60-61
- Otake Hideo vs. Hashimoto Shoji
- Gosei Tournament 1977 (?) (joseki analysis) 5: 66-67
- Judan Title Match 1981 (Games 1-3) 24: 3*; 25: 26-37*
- Kisei Tournament 1979-80 (Stage Three, quarterfinal) 24: 35-37; 25: 5
- Otake Hideo vs. Honda Kunihisa
- Gosei Tournament 1980 (play-off, Games 1 & 2) 22: 6-11
- Otake Hideo vs. Hua Xueming
- Fujitsu Cup 1994 (Round 2) 71: 43-46*
- Otake Hideo vs. Ishida Yoshio
- IBM Haya-go Open Tournament 1989 (final) 59: 39-41
- Otake Hideo vs. Kato Masao
- Gosei Title Match 1978 (Games 1-4) 9: 31-33*; 10: 12-21
- Gosei Title Match 1981 (Games 1-4) 25: 3*; 26: 12-21
- Gosei Title Match 1984 (Games 1-4) 39: 54-62
- Honinbo League 1976-77 3: 10-14
- Honinbo League 1976-77 (play-off) 3: 14-19
- Judan Title Match 1980 (Games 1-5) 20: 20-37*
- Meijin League 1977-78 (play-off) 11: 13-15
- Nihon Ki-in Championship 1974 (fuseki analysis) 12: 37-38
- Oza Title Match 1983 (Games 1 & 2) 35: 33-37*
- Otake Hideo vs. Kobayashi Koichi
- Judan Title Match 1985 (Games 1-3) 41: 36-43
- Kisei Title Match 1990 (Games 1-5) 59: 7-13; 60: 31-33, 36-45*
- Kisei Tournament 1977 (Stage Three, quarterfinal) 7: 14-15
- Kisei Tournament 1984 (Stage Three, tesuji analysis) 41: 49-50
- Meijin Title Match 1990 (Games 1-6) 62: 40-63* c
- Meijin Title Match 1992 (proper move analysis of Game 7) 126: 61-62
- Otake Hideo vs. Kudo Norio
- Gosei Title Match 1985 (Games 1-4) 44: 48-55*
- Judan Tournament 1979-80 17: 26
- Judan Tournament 1979-80 (play-off) 20: 17-20
- Otake Hideo vs. Magari Reiki
- Honinbo League 1976-77 2: 23-24
- Otake Hideo vs. Nie Weiping
- NEC Japan-China Super Go Series 1986-87 50: 7-13* c
- Otake Hideo vs. O Rissei
- Fujitsu Cup Final 1992 69: 40-44
- Otake Hideo vs. Redmond, Michael
- Judan Preliminary Tournament 1987 50: 30-31
- Tengen Tournament 1989-90 60: 62-64
- Otake Hideo vs. Rin Kaiho
- Judan Tournament 1984-85 (play-off) 41: 34-35
- Kisei Tournament 1979 (Stage Three, semifinal) 19: 35-36
- Meijin League 1989-90 61: 7
- Meijin League 1990-91 67: 27-30
- Meijin Title Match 1977 (Games 1-4) 5: 16-27; 6: 5-13
- Meijin Title Match 1978 (Games 1-6) 10: ifc*; 11: 16-34, 39
- Otake Hideo vs. Rui Naiwei
- Ing Cup 1992 (semifinal, Games 1-3) 69: 20-28
- Otake Hideo vs. Sakata Eio
- Kisei Tournament 1978 (Stage One, 9-dan final) 13: 27-30
- Kisei Tournament 1978 (Stage Two, final) 13: 30-32
- Meijin Title Match 1979 (Games 1-5) 15: ifc*; 16: 17-30*; 17: 6-11*
- Otake Hideo vs. Sato Masaharu
- Kisei Tournament 1979 (Stage Three, quarterfinal) 19: 32-36
- Otake Hideo vs. Seo Pong-su
- Ing Cup Final 1993 (Games 1-5) 70: 13-28* c, 37
- Otake Hideo vs. Takemiya Masaki
- Honinbo Title Match 1988 (Games 1-7) 54: 38-64* c; 55: 64
- Otake Hideo vs. Yoda Norimoto
- Judan Title Match 1995 (Games 1-3) 73: 45-51*
- Judan Title Match 1995 (post-joseki analysis of Game 1) 77: 50
- Otake Hideo and Futakuchi Sotoyoshi
- An Easy Introduction to Go (book review by Davies) 18: 61
- Oteai (Nihon Ki-in rating tournament)
- 1933 (Go Seigen vs. Kojima) 16: 15-16
- 1933 (Go Seigen vs. Kosugi Tei) 35: 19-20
- 1960 (Kada vs. Kuwahara) 22: 41
- 1971 triple ko (Fukui vs. Cho Chikun) 50: 18
- 1973 (Magari vs. Kato, fuseki analysis) 13: 41
- 1977 promotions 3: 2-3; 5: 40
- 1977 (?) (Ezura vs. Hanawa, joseki analysis) 1: 46-47; 5: 67-68
- 1978 game statistics 12: 4
- 1978 promotions 8: 3*
- 1978 (?) (Abe vs. Sanno, joseki analysis) 9: 49-50
- 1978 (Ando vs. Kerwin) 8: 32-33, 44
- 1978 (Nagasaki vs. Wimmer) 12: 34-35*
- 1978 (Wimmer vs. Sato) 8: 31-32
- 1979 prizes 17: 3
- 1979 promotions 13: 26*, 61; 15: 3-4*; 16: 3
- 1979 (Anonymous vs. Kaku) 17: 36-38
- 1979 (Anonymous vs. Ko Mosei) 18: 51
- 1981 promotions 23: 3; 24: 5*; 26: 2
- 1981 (Inoue vs. Redmond, middle-game analysis) 43: 7-8
- 1981 (Komatsu vs. Redmond, middle-game analysis) 43: 6-7
- 1982 promotions 28: 3; 29: 3
- 1982 (Koyama vs. Redmond, middle-game analysis) 43: 7-8, 9
- 1983 (Shinkai vs. Tanimiya) 34: 11
- 1983 (Shiratori vs. Redmond) 34: 31
- 1984 promotions 36: 3; 37: 4*
- 1984 prizewinners 37: 5
- 1985 promotions 41: 3
- 1985 (Kaku vs. Redmond) 43: 12-14
- 1985 (Redmond vs. Enda, middle-game analysis) 43: 9-10
- 1986 promotions 46: 5
- 1986 (Abe vs. Shirae) 48: 50
- 1988 promotions 53: 4
- 1990 promotions 61: 5
- 1993 promotions 70: 10
- 1994 promotions 71: 6
- 1997 promotions 79: 9
- 1999 promotions 87: 5
- 2000 promotions 89: 57
- 2000 (Aoki vs. Koyama) 93: 45
- 2001 promotions 92: 8; 93: 10; 94: 10
- 2002 promotions 95: 10; 96: 8; 97: 48
- abolition of 97: 11-12; 103: 9
- Go Seigen’s performance in 35: 14, 15-16
- Nihon Ki-in’s reform of rating system 16: 4, 37; 22: 3
- prize money 50: 51
- “The Professional Rating Tournament” (Power) 50: 47-52*; book 1 ; book 2
- Sakata Eio’s performance in 50: 58-59, 60
- winning streaks in 50: 52; 96: 8; 98: 10
- Ottawa Tournament
- 1977 note 7: 5
- Outside attachment against 3-4 approach (5-4 point joseki)
- “Capture the cutting stone” (proverb) 70: 41
- trick moves (problems) 47: 38, 49-50
- Outside attachment against one-space high approach (3-4 point joseki)
- atari problem 76: 47, 50-51
- counter attachment (problem) 92: 24, 53-54
- “The Great Joseki Debate” (Honda Kunihisa) 29: 53-58
- “New Joseki” (Abe Yoshiteru) 12: 59-60
- trick move (problem) 43: 47, 54
- two-step hane, role of 61: 53-54
- Outside liberties
- “Fill the outside liberties first” (proverb) 73: 59, 62; 74: 49, 52-53
- Outstanding players see Top players
- Overconcentration
- problem 122: 59
- Overplays
- two-step hane (examples) 60: 60
- Overseas title games
- become the latest fashion (1988) 51: 33
- Kisei Title (1985...89) 56: 32
- Oversights
- famous tesuji not seen by both players (1787) 22: 64
- “game recorder’s tesuji” (analysis) by Shioiri Itsuzo (1951) 36: 11-12
- Kobayashi Koichi’s costly blunder (Honinbo League 1982-83) 31: 4
- Overtime see Byo-yomi
- Oya Koichi
- biographical details 100: 86*
- “The Korean Style: Korean Joseki Innovations”. Parts 1-13 86 – 88 ;
- 100 – 109: ...
- Oya Koichi vs. Han Ch’eol-kyun
- 1998 (joseki analysis) 101: 45-46
- Oyama Kunio vs. Kajiwara Takeo
- Kisei Tournament 1977 (joseki analysis) 2: 44-45; 5: 68-69
- Oyama Toshiko (1920–2012)
- death of 129: 10
- Oza (Japanese title)
- see also Oza Preliminary Tournament , (Main) Tournament , Title Match
- Kato Masao’s domination in 1980s of 44: 55
- title-holders and challengers 1953-81 27: 17
- Oza Main Tournament see Oza Tournament
- Oza Preliminary Tournament
- 1979 (27th) (?): Sakakibara vs. Kajiwara (joseki analysis) 13: 58-59
- 2009 (58th): Suzuki Shinji vs. Shiraishi Yuichi (middle-game problem) 120: 60
- Oza Title Match 1977 (25th)
- Kudo Norio defeats Cho Chikun 5: 6*; 6: 22-23
- Games 1 & 2 6: 14-23
- Oza Title Match 1978 (26th)
- Ishida Yoshio wins 11: 2
- Games 1-3 11: 2*; 12: 8-17*
- Oza Title Match 1979 (27th)
- Kato Masao wins (+ results) 16: 2
- Games 1 & 2 16: 3*; 17: 23-25; 18: 6-8
- Oza Title Match 1980 (28th)
- Kato Masao wins (+ results) 22: 2
- Games 1 & 2 23: 35-41
- Oza Title Match 1981 (29th)
- Hashimoto Shoji wins (+ results) 26: 2*
- pize money 27: 8
- Games 1-3 27: 7-17
- interview with Hashimoto Shoji 27: 17
- Oza Title Match 1982 (30th)
- Kato Masao wins 29: 3, 4
- Games 1 & 2 30: 36-40*
- Oza Title Match 1983 (31st)
- Kato Masao wins (+ results) 33: 2
- Games 1 & 2 35: 33-37*
- Oza Title Match 1984 (32nd)
- Kato Masao defeats Yamashiro Hiroshi 36: 3*, 5; 37: 2*; 40: 50, 53-54
- pize money and change of format 39: 62
- results 37: 2
- Games 1-3 39: 63-64*; 40: 50-54
- Oza Title Match 1985 (33rd)
- Kato Masao defeats Kobayashi Koichi 41: 2; 44: 58
- results 41: 2
- Games 1-3 42: 46; 44: 55-58
- Game 2 (fuseki only) 46: 39*
- Oza Title Match 1986 (34th)
- Kato Masao wins (+ results) 46: 3
- prize money 48: 9
- Games 1-4 48: 7-22*
- Oza Title Match 1987 (35th)
- Kato Masao wins (+ results) 50: 3*
- Oza Title Match 1988 (36th)
- Kato Masao defeats Takemiya Masaki (+ results) 54: 3-4
- Takemiya Masaki forfeits Game 1 54: 4
- Oza Title Match 1989 (37th)
- Kato Masao defeats Hane Yasumasa (+ results) 56: 8; 57: 3 c; 58: 5 c
- Oza Title Match 1990 (38th)
- Hane Yasumasa defeats Kato Masao 62: 6*; 63: 34 c
- prize money 63: 37
- results 61: 4; 62: 6
- Game 5 63: 34-37*
- Oza Title Match 1991 (39th)
- Fujisawa Shuko defeats Hane Yasumasa (+ results) 65: 6*
- Oza Title Match 1992 (40th)
- Fujisawa Shuko defeats Kobayashi Koichi (+ results) 69: 8
- Oza Title Match 1993 (41st)
- Kato Masao defeats Fujisawa Shuko (+ results) 70: 6
- Kato family at Oza award ceremony 70: 7*
- Oza Title Match 1994 (42nd)
- Cho Chikun defeats Kato Masao (+ results) 72: 2-3
- Oza Title Match 1995 (43rd)
- O Rissei defeats Cho Chikun 75: 2*; 76: 11
- Game 3 76: 11-13
- Oza Title Match 1996 (44th)
- Ryu Shikun defeats O Rissei (+ results) 78: 2
- Oza Title Match 1997 (45th)
- Yamada Kimio defeats Ryu Shikun (+ results) 81: 4
- Oza Title Match 1998 (46th)
- O Rissei defeats Yamada Kimio (+ results) 84: 2-3*
- Oza Title Match 1999 (47th)
- O Rissei defeats Cho Chikun 88: 5-6*
- results 87: 7*; 88: 6
- Oza Title Match 2000 (48th)
- O Rissei defeats Cho Chikun (+ results) 91: 5
- Oza Title Match 2001 (49th)
- Cho Chikun defeats O Rissei (+ results) 93: 6-7; 94: 5*, 6
- Oza Title Match 2002 (50th)
- O Meien defeats Cho Chikun 96: 6; 97: 6*, 7
- results 97: 7
- Oza Title Match 2003 (51st)
- Cho U wins (+ results) 100: 5-6*
- Oza Title Match 2004 (52nd)
- Cho U wins (+ results) 103: 5-6*
- Oza Title Match 2005 (53rd)
- Cho U wins (+ results) 105: 7; 106: 5
- Oza Title Match 2006 (54th)
- Yamashita Keigo wins (+ results) 109: 6; 110: 5*
- Oza Title Match 2007 (55th)
- Yamashita Keigo wins (+ results) 113: 9; 114: 4 c
- Oza Title Match 2008 (56th)
- Cho U wins (+ results) 117: 7
- Oza Title Match 2009 (57th)
- Cho U wins (+ results) 120: 6; 121: 4*
- Oza Title Match 2010 (58th)
- Cho U wins (+ results) 124: 6*
- Oza Title Match 2011 (59th)
- Cho U wins (+ results) 127: 5
- Oza Title Match 2012 (60th)
- Iyama Yuta wins (+ results) 129: 6-7*
- Game 3 129: 62-63
- Oza Tournament 1971 (20th)
- Kobayashi K. vs. Kitani R. 46: 46-47*
- Oza Tournament 1977 (25th)
- Iwamoto vs. Takemiya 2: 19-23
- Kitamura vs. Abe (joseki analysis) 15: 45
- Kudo vs. Honda (joseki analysis) 4: 46-47; 5: 69-70
- Oza Tournament 1978 (26th)
- semifinal winners 10: 44
- Rin vs. Ishida Y. 11: 7-8
- Oza Tournament 1979 (27th)
- Kato Masao wins 15: 3
- Oza Tournament 1981 (29th)
- Hashimoto Shoji wins 25: 4
- Oza Tournament 1982 (30th)
- Kato Masao wins 29: 3
- Takemiya vs. O Rissei (ladder analysis) 29: 61
- Oza Tournament 1983 (31st)
- Otake Hideo wins 32: 4, 5
- Oza Tournament 1984 (32nd)
- Yamashiro Hiroshi wins 36: 3*
- Oza Tournament 1985 (33rd)
- Kobayashi Koichi wins 40: 2
- Oza Tournament 1986 (34th)
- Rin Kaiho wins 45: 4
- Oza Tournament 1987 (35th)
- semifinal winners 49: 4
- Oza Tournament 1988 (36th)
- Takemiya Masaki wins 53: 4
- Oza Tournament 1989 (37th)
- Hane Yasumasa wins 56: 8
- Oza Tournament 1991 (39th)
- quarterfinal winners 64: 7
- Oza Tournament 1992 (40th)
- Kobayashi Koichi wins 68: 5
- Oza Tournament 1995 (43rd)
- players reaching quarterfinals 73: 3
- semifinal winners 74: 3
- Yuki vs. Kobayashi S. (joseki analysis) 75: 41-43
- Oza Tournament 1997 (45th)
- semifinal winners 80: 4
- Oza Tournament 1998 (46th)
- “Redmond, Michael beats Cho Chikun” 84: 36-37
- Oza Tournament 1999 (47th)
- Cho Chikun wins 86: 2-3
- Sakai vs. So Yokoku 85: 21-22
- Kobayashi K. vs. Yokota 86: 50-52
- Oza Tournament 2000 (48th)
- Cho Chikun wins 90: 8
- Oza Tournament 2001 (49th)
- semifinal winners 92: 8
- Oza Tournament 2003 (51st)
- Cho U wins 99: 8
- Oza Tournament 2004 (52nd)
- Yamashita Keigo wins 102: 8
- Oza Tournament 2005 (53rd)
- Yamashita Keigo wins 105: 7
- Oza Tournament 2006 (54th)
- semifinal winners 108: 7
- Oza Tournament 2007 (55th)
- Imamura Toshiya wins 113: 9
- Oza Tournament 2008 (56th)
- Cho U wins 117: 7
- semifinal winners 116: 7
- Oza Tournament 2009 (57th)
- Yamada Kimio wins 120: 6
- Oza Tournament 2010 (58th)
- Yamada Kimio wins 123: 7
- Oza Tournament 2011 (59th)
- Hane Naoki wins 126: 9; 127: 5
- Ozaki Harumi (1927–2011)
- death of 125: 11
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