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BeginnerExercise19

 

Beginner Exercise 19 Solution
  Difficulty: Beginner   Keywords: Problem

[Diagram]
White first to live

Karl Knechtel: The eye at a is already secured. White needs to make one in the space around b.


[Diagram]
White first to live

First, White chases Black around. If B2 is played elsewhere, then White will play at W2 to seal off the second eye. Similar reasoning is applied for B4.


[Diagram]
White's tesuji

W5 threatens capture of more than enough eye space, so Black must capture.


[Diagram]
White first to live

W7 threatens to capture again so Black fills in, but it's a connect-and-die - W9 finishes the job since Black can't escape.



[Diagram]
Reference diagram

splice: Small technicality. Karl's comment: "W5 threatens capture of more than enough eye space ...". As far as I can read, anything less will leave White with one eye. To wit:


[Diagram]
Not enough

[Diagram]
Not enough pt 2

So playing until the black stone is hit is not more than enough eye space, it's actually just enough. At least, the way I see it :)



[Diagram]
Not enough (Correction)

unkx80: In the diagram entitled "Not enough", W3 is wrong, but B4 is also wrong. W5 lives.

aigo: Following the same line of logic, W7 is another mistake, it should go where B8 is to make an eye instead of capturing the black stone.

unkx80: Yes.


[Diagram]
Not enough (Correction)

B4 should be played here. Subsequently, if White a, Black throws in at B2 and the eye becomes a false.



[Diagram]
Just enough

[Diagram]
Just enough pt 2

This way White has just enough space to make a second eye.





This is a copy of the living page "Beginner Exercise 19 Solution" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.