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Solution To Question Mark Problem 2
    Keywords: Question, Tactics

[Diagram]
Diag.: Black to play and win


[Diagram]
Diag.: Main line

If White plays one of the points marked a, Black follows up at b to almost fill Black's eye space with a bulky five, killing White.

If White does nothing, Black can try to kill the corner as follows:


[Diagram]
Diag.: Killing demonstration

Suppose White has fixed up her chain and Black filled the outside liberties, then Black can capture at 1 and the large white string is in atari. White can do nothing to prevent this.



[Diagram]
Diag.: Variation

If White allows Black to connect to the outside, there are only false eyes at the marked spots in addition to the eye at 1-2.



[Diagram]
Diag.: Failure

If Black plays 1 here, White grabs the vital point. Black 3 prevents her from making two eyes but creates a bent four shape. White can capture them to create a living shape. The only thing to check is whether there are not some peculiar things in the corner:


[Diagram]
Diag.: Continuation

Black can make an eye but White puts his stones into atari.


[Diagram]
Diag.: Continuation

So nothing bad happens to White.



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