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LargeAvalancheTur...

 

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

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 one 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, Black 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.




This is a copy of the living page "Large Avalanche Turn Outward Problem" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.