Beginner Exercise 77 / Solution

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[Diagram]

Black is killed

The Black group looks to be safe, but it has a serious weakness - the marked stones have no outside liberties.

W1! kills. After W3, Black can't play at a for shortage of liberties. This trick is often seen (or threatened) in practice and called the "old mouse stealing oil" in China.

[Diagram]

Snapback

B2 and B4 tries to form an extra eye, but W3 and W5 executes a snapback, which at the same time falsify Black's last hope at a.

[Diagram]

Not enough space

B2 connect doesn't help.


Failures

[Diagram]

Failure 1

W1 is too slow. Just don't forget to defend at B4 against White's cut there.

[Diagram]

Failure 2

After W1, Black has many ways to live. For example, B2 makes a and b miai for life.



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