Kyu Exercise 4 / Attempts

Sub-page of KyuExercise4

I am only 12 kyu on KGS so this is definitely a kyu-level attempt.

[Diagram]
Solution 1: Black first kills  

Throw in with B7 to create a bulky five shape.

[Diagram]
Solution 1 failure: White lives  

My first instinct was to throw in at B3 to create the bulky five shape but W4 refutes that.

[Diagram]
Solution 2: Black first kills  

This seems to be another solution.

[Diagram]
Solution 2 variation: White 2  

White dies.


[Diagram]
Variation  

Dieter: (I have to write something on page 5000) This variation is to be considered too, I think. After W8, a play at 1 and at the marked stone are miai to live.

[Diagram]
Variation  

unkx80: Thanks for the attempts. =)

Black should play at B3. Then if W4 connects, B5 kills the group. If W4 is played at B5 instead, then Black plays at W4 and White is still dead (a is a false eye).

[Diagram]
Variation  

If White captures immediately, Black captures the two stones on the left.

[Diagram]
Variation  

If W4 here, there is no eye at the black+circle stones and a dead shape in the eyespace.


Goantti: I'll add a missing variation.

[Diagram]
Variation  

White can try W4 but then Black plays B5.

[Diagram]
Variation  

Now the points a and b are miai to kill.

[Diagram]
Not the same problem anymore  

I calculated also the variation where instead W4 above, White plays counter-atari at B5. It would have worked if there had been one more line of white stones on the right. In this case White would not take at a but would atari at W2 instead.

Bill: Oh, don't stop now! B3 above takes six white stones.
[Diagram]
Under the stones  

Now W1 kills the three black+circle stones (under the stones). If B2 then W3 oshitsubushi prevents a dead shape.


I'm only a KGS 14K, so this really, REALLY is a kyu attempt.

Here's my take on this problem. I think it works!

[Diagram]
dead?  
[Diagram]
dead? - not!  

unkx80: Explain how you would kill this.

[Diagram]
Black kills after white's mistake  

Skylancer (2K): Additional comment - if white is so kind as to connect at W2 in response to B1, then black must play at B3 immediately to kill (B5 in the original diagram).

[Diagram]
Black's second mistake  

If Black makes the mistake of playing at this B3 after White's mistake, then W4 lives all over again by making an eye and protecting the cut at A at the same time.


Kyu Exercise 4 / Attempts last edited by Unkx80 on November 25, 2009 - 18:24
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