BQM 2 / Solution

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[Diagram]

Black to play and win


[Diagram]

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]

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]

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]

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]

Continuation

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

[Diagram]

Continuation

So nothing bad happens to White. (W5 is not even necessary; B4 dies in gote)


Authors:


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