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45th Honinbo title

Preliminary finals

date black white result #mv sgf
1989-07-06 Chin Kaei Sakata Eio W+7.5 376 sgf
1989-07-13 Chino Tadahiko Fujisawa Shuko W+R 178 sgf
1989-08-03 Yoda Norimoto Sakai Takeshi B+1.5 223 sgf
1989-08-17 Oyama Kunio Rin Kaiho W+R 202 sgf

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. Takemiya Masaki 3-4 B+R W+2.5 B+2.5 W+0.5
2. Otake Hideo 5-2 W+R W+R W+5.5
3. Kobayashi Koichi 5-2 W+R W+R W+6.5 B+R
4. Kataoka Satoshi 3-4 W+0.5 W+R B+R
5. Fujisawa Shuko 0-7 B+R B+R B+R B+R
6. Sakata Eio 5-2 W+0.5 W+4.5 B+11.5
7. Rin Kaiho 4-3 W+8.5 B+1.5 W+0.5 B+R
8. Yoda Norimoto 3-4 B+5.5 B+2.5 B+2.5

Fujisawa Shuko, Yoda Norimoto, Kataoka Satoshi and Takemiya Masaki are demoted.

Challenger Playoff

date black white result #mv sgf
1990-04-16 Kobayashi Koichi Otake Hideo B+R 173 sgf

45th Honinbo Title

date black white result #mv sgf
1990-05-11,12 Kobayashi Koichi Cho Chikun W+R 160 sgf
1990-05-28,29 Cho Chikun Kobayashi Koichi W+R 176 sgf
1990-06-07,08 Kobayashi Koichi Cho Chikun B+0.5 210 sgf
1990-06-19,20 Cho Chikun Kobayashi Koichi W+R 98 sgf
1990-07-09,10 Kobayashi Koichi Cho Chikun W+7.5 269 sgf
1990-07-18,19 Cho Chikun Kobayashi Koichi B+6.5 221 sgf
1990-07-25,26 Kobayashi Koichi Cho Chikun W+3.5 230 sgf

Cho Chikun won with 4-3.