Beginner Exercise 48 / Solution

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Solution

[Diagram]

Solution: Ko

W1 puts a black stone in atari. The only defence for Black is to set up a ko at B2.

[Diagram]

Weak defence 1.

If B2 or a, White connects underneath at W3. Black is totally dead.

[Diagram]

Weak defence 2

B2 shuts in White stones, but W3 kills Black easily. Black can't approach at a nor b for shortage of liberties.

[Diagram]

Reference (W4 at W2)

This shape is dead even if Black has outside liberties. W2 makes a killable shape with nakade.


Failure

[Diagram]

Failure (W7 at W1)

W1 allows B2 to make two eyes. There is no snapback at W3 nor ko at W5.



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