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2007-11-12
Problem diagram.
White's response to Black's marked play?
Source:
Go World #38, Winter 1984-85, pp. 16-17
29th Honinbo, Awaji Shuzo vs. Rin Kaiho
Solution follows
(or click here to download SGF)
Natural, but wrong!
White 1 is in the wrong direction. Through 7, Black
makes life in sente. A horrible result for White.
White variation.
If White tries to avoid the result from the previous diagram by
connecting with 3, Black easily makes life with the sequence
through 12. White ends in sente, but Black has multiple defects
in White's wall to exploit. Another success for Black.
Correct.
White 1 is the game line. Through White 5, Black can live and
even take profit on the left side, but with sente, White can
choose how to direct the flow of the game.
White variation.
(Black 4 at 13.)
White can also think about 3, but the possibilities are numerous and
complicated enough that neither pro wanted to risk this line! One
possibility (perhaps not optimal) follows through 17, after which
White has ko threats to fight the ko.
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