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LargeAvalancheTur...

 

Large Avalanche Turn Outward Problem
  Difficulty: Advanced   Keywords: Problem, Question, Joseki

Jonathan Cano: Here is a problem derived from a variation on the Large Avalanche joseki.

First I present the problem, then the variation on the joseki that gave rise to the problem.




[Diagram]
Diag.: The problem

Jonathan Cano: White made a mistake in the large avalanche joseki . White reinforces with 1, and then tries to fight it out on the top.


[Diagram]
Diag.: one possible continuation.

Jonathan Cano:I've looked at some variations that begin with black a followed by black b but I don't feel I could play black here and be certain of killing one of the two marked white groups ...


[Diagram]
Diag.: A solution? (black 11 at a)

Andre Engels: After black 3, if white plays at 4 here, black captures the top group. After black 11, black clearly has a liberty more.


[Diagram]
Diag.: Does not work either (black 11 at a)

If instead white plays hane at 4 like here, black seems to be capturing white stones somewhere, after which the group is dead as well.


[Diagram]
Diag.: Also not interesting

White might try playing white 4 here to live, but even if it works, she needs to add a second stone almost immediately, and the white stones at the right seem to be heading for a fall.

Jonathan Cano: Thanks Andre!



The problem comes from the variation of the large avalanche in which black plays 1 below.


[Diagram]
Diag.: large avalanche, blacks turns outside

Jonathan Cano: the normal move for white here is a. In Dictionary of Basic Joseki Ishida Yoshio says white 4 at b is a mistake.


[Diagram]
Diag.: A mistake by white

Jonathan Cano: Ishida says "Black 2 seems vulgar but it avoids complications and guarantees a favorable result. For his part White has no choice but to make the vulgar ataris of 3 and 5. White answers at a or b."


[Diagram]
Diag.: A mistake by white, continuation b.1

Jonathan Cano: here is the continuation when white plays at b in the diagram above.


[Diagram]
Diag.: A mistake by white, continuation b.2

[Diagram]
Diag.: A mistake by white, continuation b.3

Jonathan Cano: After black 2 Ishida says black a and b are miai so white is hopeless.





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