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 in sente, and W5 kills. If the marked stones had one or more outside liberty, Black is alive.


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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