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KanazawaProblem74

 

Kanazawa Problem 74 / Solution
Sub-page of KanazawaProblem74

Main line: Hashimoto Utaro
Variations: Dieter


[Diagram]
Main line

[Diagram]
Main line - continuation

White captures three to make an eye. Black can't protect there because of shortage of liberties.



Variations

[Diagram]
Variation (i) at 8

If B8 at B1 here, cutting at W2 makes miai of a and b :


[Diagram]
Variation (i) at 8 - a

Capturing at W4 makes a second eye at BC. Black can't play B7 at a.


[Diagram]
Variation at 8 - b

Here too White makes two eyes at the circled points.


[Diagram]
Variation (ii) at 8

If Black connects at B1, the atari at W2 is sente (see next diagram) and W4 makes a bent four living shape.


[Diagram]
Variation (ii) at 8 - variation

If B3 here, capturing three stones with W4 assures a quiet life. Even if Black throws in at B5, White is alive with a and b being miai.


[Diagram]
Variation at 4

Giving atari this way would not be very smart. White now captures either at a or at b.


[Diagram]
Variation at 2

[Diagram]
Variation at 2 - continuation

B9 at W6. The variation is long, but up until B1 in this diagram it is forced and the W2-B5 exchange is well known. White has to find the throw-in at W6, though.


[Diagram]
Variation at 2 - variation

(Black 11 at W8.)

Maybe it is simpler to play W2 here and fire off the sequence W4-B10 then.



Failures

We will have a look at some preparatory moves: why White should not yet start the well-known sequence.

[Diagram]
Failure (i) at 7

If a has not yet been exchanged for b, White runs out of options. Whatever she does, Black will connect at c.


[Diagram]
Failure (ii) at 7

Blocking here is not sente: Black can take time to hane. White can't makes an eye in the corner because a and b are miai for Black.

If W3 at b then B4 at a and there are only false eyes in the corner.


[Diagram]
Failure (i) at 5

The sequence becomes less effective, the more preparatory moves are omitted.


[Diagram]
Failure (ii) at 5

See previous diagrams.





This is a copy of the living page "Kanazawa Problem 74 / Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.