Kyu Exercise 45 / Solution

Sub-page of KyuExercise45

Table of contents Table of diagrams
White dies.
White lives.
Comment.
Failure - ko.
Failure - death.
Failure - death.
White's strongest resistance.
White dies.
White dies.
Comment.
Failure - ko.

Problem I

Black first

[Diagram]

White dies.

B1 turns the potential eye at the top side into a false one. White can only make at most one eye at the center, so White dies.



White first

[Diagram]

White lives.

The descent at W1 is key. It makes capturing at B4 and making the second eye at W5 miai, so White lives.

[Diagram]

Comment.

Starting with the atari with W1 lives as well, but White makes an unneccessary sacrifice.

[Diagram]

Failure - ko.

Making an atari at W1 is a failure. White's only saving grace is to live with a ko at W3 and W5.

[Diagram]

Failure - death.

W3 makes only one eye on the upper side.

[Diagram]

Failure - death.

W3 is interesting. However, B4 kills unconditionally. Note that B6 is sente. If W5 at B6, then B6 at W5.



Problem II

White first

[Diagram]

White's strongest resistance.

W1 is White's strongest resistance.

[Diagram]

White dies.

B2 is tesuji, White dies.

[Diagram]

White dies.

If W3, B4 connects and finished the job.

[Diagram]

Comment.

Having the exchange at W1 and B2 does not help White at all.

[Diagram]

Failure - ko.

Black saves two stones at B2, but at a price of allowing White to get a ko for life.


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