BQM 570

   
[Diagram]

Fuseki

Dieter: I'd like to learn more about this fuseki pattern because it often occurs in pro games and it happens to be played against me as well. I assume this is a Kobayashi fuseki variant. The kosumi of B9 is described at 3,4 point distant low approach, kosumi.

Next, ...

[Diagram]

Fuseki

... this is what Dinerchtein in his commentaries on go4go.net very often describes as "the usual pattern". I'd like to understand more about the peep at B3. I can see it coming that thousands of amateur games will contain this "joseki move" without anyone understanding its purpose.

My ideas: if W4 at a instead, Black doesn't need to defend at B5 because a white approach there can be cut off thanks to the gap at W4. In this case, both defend. Question: what happens if W6 is left out ?



Charles Well, first, I guess B5 at the circled point is more the normal idea. If we are talking about the variation with black+square, that's less common than one to the right, of course. And I know more about the peep B3 when white+circle is at the square-marked point.

That all being said, Sasha is talking about things 'well-known' in Korea, amongst the young pros. His commentaries assume this kind of background.

There is nothing especially mysterious here, I think. If W4 is forced, and there is no way to resist, then B3 becomes an inducing move for B5. There are other examples on SL that I'll reference when I find them.[1]

Just one point, mentioned by Guo Juan when she was in London a few year ago:

[Diagram]

A way to resist

It seems that W1 is the tactical chance to avoid being forced.[2]


[1]

I meant


[2]

[Diagram]

Kikashi

Charles I don't see any pro examples exactly like that. I do see what's in this diagram: after an earlier exchange black+circle/white+circle/black+square, White uses the kikashi W1 to strengthen. This controls the black+circle stone to some extent.


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