Oza

The Oza ("Throne") is one of the older titles in Japanese professional Go, originating in 1953 and sponsored by the Nihon Keizai Shimbun (Nikkei), Japan's leading financial newspaper. The format features a single-elimination preliminary whose winner challenges the defending Oza in a best-of-five title match, with a winner's prize of approximately 14 million yen. Kato Masao holds the record with eight consecutive titles (1982-1989), earning him the rank of Honorary Oza. The title gained historic significance in 1994 when Cho Chikun captured the Oza to become the first player ever to have held all seven major Japanese titles.

Country Japan Type Title Match Format Knockout Title Cycle 1y Komi 6.5 Editions 75

2024 · Edition #72

Champion: Iyama Yuta · Runner-up: Shibano Toramaru

Final Preliminary, Group Final 11 games

Apr 15 Shida Tatsuya B+2.5 Rin Kanketsu Apr 18 Oba Junya W+0.5 Sakai Yuki Apr 18 Seto Taiki B+R Mukai Chiaki Apr 25 Cho U W+2.5 Mutsuura Yuta Apr 25 Mitani Tetsuya W+7.5 Anzai Nobuaki May 2 Yuki Satoshi B+R Tsuruta Kazushi May 6 Fujita Akihiko B+R Kimu Sujun May 16 Kono Rin W+R Sada Atsushi May 16 Hirose Yuichi W+R U Boi May 16 Takao Shinji B+5.5 Tanaka Koyu May 16 Shida Tatsuya B+R Nishi Takenobu

Final 4 games

Oct 16 Shibano Toramaru B+R Iyama Yuta Oct 25 Iyama Yuta B+R Shibano Toramaru Nov 26 Shibano Toramaru W+R Iyama Yuta Dec 6 Iyama Yuta B+R Shibano Toramaru

A Preliminary, Group Final 9 games

Jan 8 Takao Shinji B+R Nakamura Shinya Jan 11 Yokotsuka Riki W+0.5 So Yokoku Jan 15 Rin Kanketsu B+4.5 Mimura Tomoyasu Jan 15 Ogata Masaki B+R Imamura Yoshiaki Jan 18 Otake Yu W+2.5 Hane Naoki Jan 18 Sakai Yuki B+R Cho Sonjin Jan 18 Nakano Hironari W+R Tsuruta Kazushi Jan 29 Shuto Shun W+R Tanaka Yuki Feb 8 Kimu Sujun B+R Han Zenki

Challengers' Final 1 game

Aug 30 Ichiriki Ryo W+R Shibano Toramaru

Semi-final 2 games

Aug 22 Ichiriki Ryo B+R Sada Atsushi Aug 22 Kyo Kagen W+R Shibano Toramaru

Quarterfinals 4 games

Jul 25 Ichiriki Ryo B+R Sakai Yuki Jul 25 Shibano Toramaru B+R Mutsuura Yuta Aug 1 Kyo Kagen B+R Shida Tatsuya Aug 8 U Boi W+0.5 Sada Atsushi

Round of 16 7 games

Jun 13 Fujita Akihiko W+R Ichiriki Ryo Jun 13 Anzai Nobuaki W+R Sada Atsushi Jun 17 Yo Seiki W+R Sakai Yuki Jun 24 Kyo Kagen B+1.5 Takao Shinji Jun 27 Shida Tatsuya B+0.5 Seto Taiki Jul 1 Seki Kotaro W+R Shibano Toramaru Jul 3 Yuki Satoshi W+7.5 U Boi

Preliminaries 25 games

Jun 29 Fujimura Yosuke B+8.5 Sugiuchi Kazuko Jul 3 Shiraishi Yuichi B+R Ko Reibun Jul 13 Ishigure Ikuro W+R Ueno Asami Jul 20 Fujisawa Rina B+6.5 Yanagihara Saki Jul 26 Fujita Reo W+R Konno Tameto Jul 31 Nakamura Sumire W+R I Ryo Aug 28 Fujisawa Rina B+R Awaji Shuzo Nov 27 Numadate Sakiya W+R Sakai Yuki Dec 7 Xie Yimin W+R Yokotsuka Riki Dec 14 Fujisawa Rina B+R Moro Arisa Jan 17 U Boi B+R Shintani Yosuke Jan 18 Fujisawa Rina B+R I Ryo Jan 24 Seto Taiki B+1.5 Omote Yuto Jan 29 Mishima Hibiki W+R Takashima Yugo Jan 31 Utsumi Koki W+R Tsuji Shigehito Jan 31 Fujii Shuya W+R Tanaka Koyu Feb 7 Kimu Pyonmin W+R Seto Taiki Feb 7 Nishi Takenobu B+R Sato Yuta Feb 7 Okawa Takuya W+R Hon Akiyoshi Feb 14 Tanaka Koyu B+R Tsuji Shigehito Feb 21 Takashima Yugo W+R Seto Taiki Mar 21 Cho Chikun W+7.5 Kobayashi Satoru Mar 28 Tanaka Koyu B+R Tanaka Yuki Apr 4 Anzai Nobuaki B+1.5 Fujisawa Rina May 15 Murakawa Daisuke B+1.5 Taniguchi Toru

A Preliminary 10 games

Oct 26 So Yokoku B+0.5 Son Makoto Oct 26 Ko Iso W+R Koyama Kuya Nov 2 Ogaki Yusaku W+3.5 Rin Kanketsu Nov 2 Miyazawa Goro W+7.5 Takao Shinji Nov 9 Hirata Tomoya W+R Cho Chikun Nov 13 Nakamura Shinya B+1.5 Fukuoka Kotaro Nov 30 Tsuruta Kazushi B+R Hikosaka Naoto Nov 30 Iwata Saeka W+9.5 Okawa Takuya Dec 11 Adachi Toshimasa W+R Yi Liao Dec 14 Ogata Masaki B+R Yamashiro Hiroshi

2024-04-08 2 games

Apr 8 Sada Atsushi B+R Ida Atsushi Apr 8 Kobayashi Satoru W+R U Boi

2024-03-28 1 game

Mar 28 Cho Riyu W+1.5 Tsuruta Kazushi

2024-03-14 2 games

Mar 14 Sakai Yuki B+R Hane Naoki Mar 14 Cho U B+1.5 Suzuki Shinji