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KanazawaProblem33

 

Kanazawa Solution 33
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[Diagram]
Diag.: Black lives

Black 1 is tesuji. It is the effective use of the belly attachment suji. It deals with two problems simultaneously, namely White's cut at A and Whiter's watari at B.



[Diagram]
Diag.: Main line

White 4 may be an unexpected resistance. Black 5 makes miai if A and B.


[Diagram]
Diag.: Continuation 1

After 5, the circled points show Black's liberties (4). Even if White effectively captures the stones, Black connects at A and White has three liberties : two inside the eye, and one internal, which Black cannot count. (See Richard Hunter's theory on CountingLiberties.)


[Diagram]
Diag.: Continuation 2

White can't connect at A due to damezumari.

KarlKnechtel: But what if white 3 at 4, giving this diagram?


[Diagram]
Diag.: Continuation 2a

Now black can't cut at a, and white has time to connect there later - and there doesn't appear to be room for a second eye for black anywhere.

unkx80: You are right. Black 2 has to be played at 3 instead, giving the following diagram.


[Diagram]
Diag.: Continuation 2 Corrected

Black should play at 2 in this diagram, and white has no good resistance. Also after black 2, white is caught in a shortage of liberties, so white cannot play at a.



The following diagrams are just to prove the statement of the reference diagram, i.e. that Black 1 defends against two threats.

[Diagram]
Diag.: 1. The cut

[Diagram]
Diag.: 2. The connetion

Caution ! Black is not alive in sente ! He has to answer. If not:


[Diagram]
Diag.: Beware of the Belly

White's belly attachment makes ko. Black cannot answer with 2 at 3, because White 3 at 2 will then reduce him to one eye.



In the above diagrams, notice that Black answered the White attacks twice at the same point. White's strongest resistance is to play at that point herself (cfr main line).


Now for some failures.

[Diagram]
Diag.: Wrong 1

The vulgar (crude) move (zokusuji) at 1 provokes a forcing magari at White 2, giving White the time to atari with 4.



[Diagram]
Diag.: Wrong 2 (at move 5)

If Black hane at 5, White 6 threatens to make two eyes, and 8 makes it ko.



[Diagram]
Diag.: Wrong 2 (at move 5)

If Black turns at 5, White ataris from the other side (again threatenig to make two eyes) and then captures two stones with 8. Black can neither play at A nor B, due to damezumari.



Problem34
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