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KanazawaSolutions

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KanazawaProblem74

 

KanazawaSolution74
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Main line: HashimotoUtaro
Variations: Dieter


[Diagram]
Diag.: Main line

[Diagram]
Diag.: Main line - continuation

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


Variations

[Diagram]
Diag.: Variation (i) at 8

If Black 8 at 1 here, cutting at 2 makes miai of 'a' and 'b' :


[Diagram]
Diag.: Variation (i) at 8 - a

Capturing at 4 makes a second eye at the marked stone. Black can't play 7 at 'a'.


[Diagram]
Diag.: Variation at 8 - b

Here too White makes two eyes at the circled points.


[Diagram]
Diag.: Variation (ii) at 8

If White connects at 1, the atari at 2 is sente (see next diagram) and White 4 makes a bent four living shape.


[Diagram]
Diag.: Variation (ii) at 8 - variation

If Blacj 3 here, capturing three stones with 4 assures quiet life. Even if Black throws in at 5, White is alive with 'a' and 'b' [miai.


[Diagram]
Diag.: Variation at 4

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


[Diagram]
Diag.: Variation at 2

[Diagram]
Diag.: Variation at 2 - continuation

Black 9 at 6. The variation is long, but up til 1 in this diagram it is forced and the 2-5 exchange is well known. White has to find the throw-in at 6 though.


[Diagram]
Diag.: Variation at 2 - variation

(Black 11 at 8.)

Maybe it is simpler to play White 2 here and fire off the sequence 4-10 then.



Failures

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

[Diagram]
Diag.: Failure (i) at 7

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


[Diagram]
Diag.: Failure (ii) at 7

Blocking here is not sente: Black can take time to hane. White makes no eye in the corner because a and b are miai for Black.

If White 3 at 'b' then Black 4 at 'a' and there are only false eyes in the corner.


[Diagram]
Diag.: Failure (i) at 5

The sequence becomes lesser effective the more prepatory moves are omitted.


[Diagram]
Diag.: Failure (ii) at 5

See previous diagrams.




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