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LargeAvalanche

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Large Avalanche Turn Outward
  Difficulty: Dan level   Keywords: Joseki

[Diagram]
Diag.: The large avalanche: turn

After black 1, the moves to white 6 are considered the best continuation, although there is some variation possible, especially for white 4. After this, black has to choose whether to save or sacrifice his three stones.

Jonathan Cano: I've created a problem for a non-joseki variation on white 4 in Large Avalanche Turn Outward Problem. The problem begins with white 4 at 5.


[Diagram]
Diag.: Sacrifice

Nowadays, black 1 is considered the joseki move. Black allows white to take his three stones and the corner, taking influence in return. The sequence to 5 is the current joseki. Some minor variations are possible: White might forsake the atari at 4 and play at 6 directly, while black might exchange A for white B before playing 7. The exchange of A for B used to be the basic joseki, but nowadays it is most often left unplayed, because black wants to keep the option open of forcing with C rather than A.


[Diagram]
Diag.: White jumps out

If white plays 2 here, black will switch plans and take the corner.


[Diagram]
Diag.: The continuation

Unfortunately I have no commentaries on this ensuing sequence, and I am not strong enough to give them myself. Anyone?


[Diagram]
Diag.:

Black 1 is also a possibility. If white answers at A, the black group is alive (and thus the corner captured), but white B and white C are both sente. It is however more likely that white will immediately counterattack with 2. This continuation is taken from a game between Kudo? and Rin in the 1997 Tengen match (note that the variation goes on for 24 more moves after black 9)


[Diagram]
Diag.: Sacrifice

Saving the black stones with 1, rather than sacrificing them with 8, used to be joseki.


[Diagram]
Diag.: Continuation

This used to be a popular joseki around 1950. Nowadays the fact that black has to play to moves (1 and 3) to capture the corner is regarded too large a disdavantage.


[Diagram]
Diag.: Another possibility

Black 1 seemed to improve on black 6, allowing black to take the corner with one move, until the counter-measure of white 4 was discovered.


[Diagram]
Diag.: The continuation

Because black still has to take the three stones off the board, so his territory is rather small, while white has been able to play on both sides, this is considered good for white. If black plays 3 at A, white can create a ko, while if black does not play 5, white plays at B and black dies outright.


[Diagram]
Diag.: A variation

If white plays 4 in the main diagram at 1 here, he can capture the three stones whatever happens. However, this gives black too much thickness (note that black A next makes a ponnuki in sente).

Authors:

  • Andre Engels
  • (add your name if you make a significant contribution to this page)


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