Beginner Exercise 26 / Solution

Sub-page of BeginnerExercise26

Solution

[Diagram]

Solution

This bent four shape has a serious weakness: the cutting point at a and the marked stones without outside liberties. W1 makes miai of the snapback at a and destroying the eye at b.

[Diagram]

continued

After B2, W3 is atari reducing Black's eye space. If Black defends with B4, then W5 kills. If the marked stones had one or more outside liberty, Black could live by playing B4 at W5 instead.


Failures

[Diagram]

Failure 1

W1 is an example of a bad atari which should not be played. B2 connects, and now a and b are miai, so Black lives.

[Diagram]

Failure 2

W1 is met by B2 (or a) to secure two eyes.

(For advanced readers: B2 is slightly better than a because Black has two ko threats here after two successive White moves, which are possible in a ko fight)



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