Takagawa beats Go Seigen by a rule.

White: Go-Seigen, 9-dan

Black: Honinbo Shukaku[JH1] , 8-dan
 

 

Fig. 4. ( 123-200 )

186 connects

 

 

 

Fig. 4. ( 123-200 )

Black 23: Necessary to capture White's group at the lower side,

White 24: While will play according to Black's reply. Any special move of White's at the lower side may endanger White's group there, or when White tries to live, Black can secure a vast territory and win the game. ( See Dia. 21)

Dia. 21

 Dia. 21: Black obtains a huge area up to 8.

White 40: Cannot play any move to live in the lower left corner, because Black 40 after Black 'a', White 'b' ; will choke White's throat.

White 50 ...56 : Preparation for 58.

Black 59: If Black 60 instead, then White will play 'c'. The middle Black group was in the siege of White. It was White's success.

 

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 [JH1] A name for Takagawa Kaku when he had won the Honinbo title