25th Honinbo title

Preliminaries

The finals of the preliminaries were won by Fujisawa Hosai, Iwata Tatsuaki, Kano Yoshinori, and Hisai Keishi.

League

In the first column the white player, on the top row the black player.

#	player	result	1	2	3	4	5	6	7	8
1.	Fujisawa Hosai	3-4			W+R		W+R		B+R
2.	Kato Masao	5-2	B+R			B+11.5		W+R		W+R
3.	Hisai Keishi	1-6		B+R			B+0.5		W+0.5
4.	Sakata Eio	6-1	W+R		W+1.5			W+R		W+R
5.	Takagawa Shukaku	3-4		B+R		B+R			W+R
6.	Iwata Tatsuaki	3-4	W+8.5		W+8.5		B+3.5			B+0.5
7.	Fujisawa Shuko	2-5		B+R		W+11.5		B+R
8.	Kano Yoshinori	5-2	W+R		W+R		W+0.5		W+R

Demotion Playoff

Each of Takagawa Shukaku, Iwata Tatsuaki and Fujisawa Hosai ended with 3 wins. A playoff determined who of these three remained in the League. Fujisawa Hosai won.

date	black	white	result	#mv	sgf
1970-06-17,18	Takagawa Shukaku	Iwata Tatsuaki	B+R	253	sgf
1970-07-01,02	Takagawa Shukaku	Fujisawa Hosai	W+2.5	284	sgf

25th Honinbo Title

date	black	white	result	#mv	sgf
1970-04-27,28	Sakata Eio	Rin Kaiho	W+2.5	253	sgf
1970-05-07,08	Rin Kaiho	Sakata Eio	B+0.5	264	sgf
1970-05-15,16	Sakata Eio	Rin Kaiho	W+6.5	246	sgf
1970-05-27,28	Rin Kaiho	Sakata Eio	B+1.5	240	sgf

Rin Kaiho won 4-0.