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SanrenseiFuseki

 

Playing against sanrensei
    Keywords: Opening

[Diagram]
Playing against sanrensei

It is fairly customary for Black to use the one-space pincer against a white approach to a 4-4 stone, in the sanrensei formation. Normally, White will enter the corner. and Black will gain magnificent thickness, a result which in my eyes is very good for Black.



Therefore, instead of doing what Black wants, it is possible to play W3 as a double kakari.[1]

After W7, both Black a and Black b result in White getting a base inside Black's sanrensei:

[Diagram]
Variation 1

[Diagram]
Variation 2



Therefore, if Black wants to keep his framework, he should refrain from attaching:

[Diagram]
Variation 3

[Diagram]
Variation 4

Both a and b are seen in professional play these days.


[Diagram]
Variation 5

It is wrong for Black to attach against the second kakari stone as shown.


[Diagram]
Variation 6

On top of that, White has the cut at a and the aji at 'b' to look forward to.

- FlorisBarthel



[1]

Charles Matthews I'm having some difficulty verifying what is said here. I haven't yet found any pro games exactly matching the first diagram.

[Diagram]
Joseki?

Just looking at the upper right (including BC) this has happened a couple of times in high-level games, at the end of the sequence proposed in Variation 1.



There are games where the Variation 1 sequence is played, without BC. In that case, I suppose, White is more interested in playing later at a: so may avoid playing W1.

Floris Barthel You beat me to posting that ^_^

[Diagram]
Big oyose continuation

Just as a sidenote to this variation, black has a HUGE endgame concerning this position but should not be played inmediately as it removes the aji of the two stones.

Dieter: Aha ! I can see Guo Juan is consistent in her teaching ...

FlorisBarthel: Did she teach you this too? :)



Charles Well, I had figured out that this is a Guo Juan lesson: she played this joseki against Rui Naiwei in 2001, for one thing.

Anything that gets posted here is supposed to be discussed, though. We haven't really started on whole-board opening theory.



This is a copy of the living page "Playing against sanrensei" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.