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3rd Honinbo title

After knockout preliminaries for 5- to 7-dans, and a tournament for the winners and the 8-dans, the top three players were Fujisawa Hosai, Iwamoto Kaoru and Nakamura Yutaro. These three proceeded to play a League.

League

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

#	player	result	1	2	3
1.	Iwamoto Kaoru	2-0		W+R
2.	Fujisawa Hosai	1-1			W+F
3.	Nakamura Yutaro	0-2	B+R

3rd Honinbo Title

date	black	white	result	#mv	sgf
1945-07-23,24,25	Hashimoto Utaro	Iwamoto Kaoru	W+5	295	sgf
1945-08-04,05,06	Iwamoto Kaoru	Hashimoto Utaro	W+5	240	sgf
1945-11-11,12,13	Hashimoto Utaro	Iwamoto Kaoru	B+3	245	sgf
1945-11-15,16,17	Iwamoto Kaoru	Hashimoto Utaro	B+3	295	sgf
1945-11-19,20,21	Hashimoto Utaro	Iwamoto Kaoru	B+R	147	sgf
1945-11-23,24,25	Iwamoto Kaoru	Hashimoto Utaro	B+R	231	sgf

The match was being played in Hiroshima. The first game in the center. The second game, at the insistence of a police officer, in the outskirts. On the third day of the second game the atomic bomb was dropped (according to Iwamoto, between White 106 and Black 107). Windows were broken, stones were shattered, but the players set the position up again and continued. Hashimoto won. Afterwards, the match was suspended for three months, until after the end of the war.

This match ended in 3-3. The rules prescribed a final game, with 4.5 komi, but the match was not continued. The following year, a best-of-three playoff was played.

date	black	white	result	#mv	sgf
1946-07-31,08-15,16,17	Hashimoto Utaro	Iwamoto Kaoru	W+5	305	sgf
1946-08-19,20,21	Iwamoto Kaoru	Hashimoto Utaro	B+6	274	sgf

Iwamoto Kaoru won 2-0.

As Honinbo, Iwamoto took the name Honinbo Kunwa.