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21st Judan title

Winners' Section

Winners' Section
Sonoda Yuichi	Otake Hideo W+R	Otake Hideo B+5.5	Otake Hideo B+R	Kato Masao W+R
Otake Hideo	Otake Hideo W+R
Iwata Tatsuaki	Iwata Tatsuaki B+R
Sugiuchi Masao	Iwata Tatsuaki B+R
Honda Kunihisa	Honda Kunihisa B+3.5	Kobayashi Koichi W+R
Kori Toshio	Honda Kunihisa B+3.5
Kobayashi Koichi	Kobayashi Koichi B+R
Sakata Eio	Kobayashi Koichi B+R
Ishida Yoshio	Ishida Yoshio B+2.5	Koyama Yasuo W+1.5	Kato Masao W+R
Hashimoto Shoji	Ishida Yoshio B+2.5
Koyama Yasuo	Koyama Yasuo B+R
Kanashima Tadashi	Koyama Yasuo B+R
Kubouchi Shuchi	Kojima Takaho W+R	Kato Masao W+R
Kojima Takaho	Kojima Takaho W+R
Tono Hiroaki	Kato Masao W+8.5
Kato Masao	Kato Masao W+8.5

Losers' Section

Losers' Section
Sonoda Yuichi	Sugiuchi Masao W+2.5	Sugiuchi Masao W+11.5	Sugiuchi Masao B+R	Sugiuchi Masao W+R	Kobayashi Koichi B+R
Sugiuchi Masao	Sugiuchi Masao W+2.5
Kori Toshio	Sakata Eio B+R
Sakata Eio	Sakata Eio B+R
Hashimoto Shoji	Kanashima Tadashi B+1.5	Tono Hiroaki B+R
Kanashima Tadashi	Kanashima Tadashi B+1.5
Kubouchi Shuchi	Tono Hiroaki W+R
Tono Hiroaki	Tono Hiroaki W+R
Otake Hideo
Iwata Tatsuaki		Iwata Tatsuaki W+R	Iwata Tatsuaki B+R	Kobayashi Koichi W+0.5
Honda Kunihisa		Iwata Tatsuaki W+R
Ishida Yoshio		Ishida Yoshio B+1.5
Kojima Takaho		Ishida Yoshio B+1.5
Kobayashi Koichi			Kobayashi Koichi W+4.5
Koyama Yasuo			Kobayashi Koichi W+4.5

Challenger decision match

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

date	black	white	result	#mv	sgf
1983-02-10	Kato Masao	Kobayashi Koichi	B+R	219	sgf

21st Judan Title

date	black	white	result	#mv	sgf
1983-03-03	Cho Chikun	Kato Masao	W+0.5	277	sgf
1983-03-25	Kato Masao	Cho Chikun	B+0.5	307	sgf
1983-03-06	Cho Chikun	Kato Masao	B+R	193	sgf
1983-04-13	Kato Masao	Cho Chikun	W+R	178	sgf
1983-04-27	Cho Chikun	Kato Masao	W+0.5	257	sgf

Kato Masao won with 3-2.