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KanazawaProblem11

 

Kanazawa Solution 11
Path: KanazawaSolutions   · Prev: KanazawaSolution10   · Next: KanazawaSolution12
  Difficulty: Beginner   Keywords: Life & Death, Tesuji, Tactics, Problem

Authors:
Main line: Hashimoto Utaro 9p
Variations: BillSpight, DieterVerhofstadt 1k

[Diagram]
Black to live

The 1-2 point prevails over the 2-2 point again.


[Diagram]
Black to live

There is no way White can attack Black. The distance between 1 and the marked stone is wide enough for him to make a second eye (the circled point).



[Diagram]
Wrong

If Black carelessly plays at the 2-2 point, White takes the vital point with 2 and sets up an approach ko. Black can't block at a because of damezumari. So he has to fight the ko at 2. After White recaptures the ko ...


[Diagram]
Wrong (cont.)

... she connects at 1, putting the four black stones in atari. Black takes the ko with 2 putting three white stones in atari; White connects at 3, and Black makes an eye with 4. Now White takes the ko. So, White has to play an extra move, and if Black loses the corner, he will have played twice elsewhere in return. Anyway, living unconditionally is much better for Black.



[Diagram]
Wrong (ii)

Enlarging the eyespace with 1 is dubious. After White 2, Black has to defend his cutting point with 3. Further enlarging the eyespace with 5 forces 6 and now White can either atari at a in the future, or if Black plays there, almost fill Black with a farmer's hat by playing at b.



[Diagram]
Wrong (ii) (cont)

Fancy play at 3 doesn't help much. After White 4 on the 2-1 point, White can answer Black 5 with White 6, preventing any escape. Black has only one eye. Now 7 and 8 are miai points.



[Diagram]
Wrong (ii) (cont)

Black does better to try to run with Black 3, eliciting White 4. Now Black 5 sets up a ko.



[Diagram]
Wrong (iii)

Black 1 leads to a throw-in ko.



[Diagram]
Black lives

Black 1 : Doesn't Black live now, too?



BillSpight: It loses almost 3 points by comparison to the correct play. White has the following sente sequences.

[Diagram]
White sente

White 1 - Black 2 is a two-point sente play. Black 5 - White 6 is 1 2/3 points in sente.



If Black omits 6, White kills:

[Diagram]
White kills


Problem 12
Back to KanazawaTesujiSeries



Path: KanazawaSolutions   · Prev: KanazawaSolution10   · Next: KanazawaSolution12
This is a copy of the living page "Kanazawa Solution 11" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.