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18th Judan title

Winners' Section

Winners' Section
Ishida Akira	Ishida Akira B+5.5	Ishida Akira W+R	Otake Hideo W+R	Otake Hideo W+R
Shimamura Toshihiro	Ishida Akira B+5.5
Sakata Eio	Hashimoto Shoji W+R
Hashimoto Shoji	Hashimoto Shoji W+R
Sakai Takeshi	Otake Hideo W+R	Otake Hideo B+8.5
Otake Hideo	Otake Hideo W+R
Rin Kaiho	Honda Kunihisa W+2.5
Honda Kunihisa	Honda Kunihisa W+2.5
Nakamura Hidehito	Nakamura Hidehito B+R	Nakamura Hidehito W+R	Kudo Norio B+R
Kajiwara Takeo	Nakamura Hidehito B+R
Haruyama Isamu	Ishida Yoshio W+R
Ishida Yoshio	Ishida Yoshio W+R
Cho Chikun	Sonoda Yuichi W+5.5	Kudo Norio B+R
Sonoda Yuichi	Sonoda Yuichi W+5.5
Kudo Norio	Kudo Norio B+R
Ohira Shuzo	Kudo Norio B+R

Losers' Section

Losers' Section
Shimamura Toshihiro	Sakata Eio W+R	Rin Kaiho B+R	Rin Kaiho B+R	Kudo Norio B+R	Kudo Norio W+4.5
Sakata Eio	Sakata Eio W+R
Sakai Takeshi	Rin Kaiho W+R
Rin Kaiho	Rin Kaiho W+R
Kajiwara Takeo	Kajiwara Takeo B+R	Cho Chikun W+9.5
Haruyama Isamu	Kajiwara Takeo B+R
Cho Chikun	Cho Chikun B+R
Ohira Shuzo	Cho Chikun B+R
Kudo Norio
Hashimoto Shoji		Hashimoto Shoji W+R	Hashimoto Shoji W+R	Hashimoto Shoji B+R
Honda Kunihisa		Hashimoto Shoji W+R
Ishida Yoshio		Ishida Yoshio B+3.5
Sonoda Yuichi		Ishida Yoshio B+3.5
Ishida Akira			Ishida Akira W+R
Nakamura Hidehito			Ishida Akira W+R

Challenger decision match

Winner of the Winners' Section against winner of the Losers' Section.

date	black	white	result	#mv	sgf
1980-02-13	Otake Hideo	Kudo Norio	B+R	205	sgf

18th Judan Title

date	black	white	result	#mv	sgf
1980-03-05	Kato Masao	Otake Hideo	W+4.5	246	sgf
1980-03-12	Otake Hideo	Kato Masao	B+2.5	260	sgf
1980-04-01	Kato Masao	Otake Hideo	B+R	207	sgf
1980-04-09	Otake Hideo	Kato Masao	W+R	220	sgf
1980-04-14	Kato Masao	Otake Hideo	W+0.5	223	sgf

Otake Hideo won with 3-2.