3-4 point, 5-4 approach, one-space low pincer, separate

    Keywords: Joseki

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Comment: include BQM 545


[Diagram]

seen in recent pro play

When white separates with 1, Black 2 and White 3 seem to be a common continuation, at which point black must choose which side to develop, possibly with a or b.

The jump down to the second line is usually slow unless White has prospects for a severe attack, for example if White occupies the two adjacent corners as in the following diagram:

[Diagram]


moved from BQM535, there is more discussion there

[Diagram]

A (not-so-well) known joseki (B7 just a possibility, may be at a as well.)

[Diagram]

A joseki

Tapir: I have trouble in understanding the sequence after from W12 onwards, any takers? Why B13 and not the cut, why W14?


Comparison to old joseki

[Diagram]

The old joseki

Uberdude: For reference here is the old version of this joseki. (In fact there are some other variations, for example B5 can be extension at c to stop white taking the corner). Black can then continue by playing at a or b. The downside of a is that white's marked stones still has lots of aji so black isn't thick here. Sometimes white will save them immediately.

[Diagram]

The old joseki: continuation - somewhat overconcentrated for black

If black cuts at b he is more solid, but white can force him into a rather overconcentrated shape as shown. Note that the white stones on the outside can be treated as kikashi and sacrificed if needed.


So, now lets compare these results to the (newer) joseki in the original question. In the new joseki white's corner is a bit bigger, but black is thicker on the outside due to the extension at B19. This extra thickness is generally judged to be of greater benefit to black than the extra points white got in the corner (afterall white is alive in both cases).

[Diagram]

The new joseki, again

The reason B13 is not the cut is then it would revert to the old joseki, which is not as good for black. W14 takes a liberty off the black stone preparing the trade. With B15 he abandons the corner in order to make the cut and get sente again to extend for thickness at B19, but before doing that black plays B17 in sente (otherwise he extends at W18 and white's eyes in the corner are gone).


[Diagram]

Not so good 14

W14 here is not good: it ends up like the old joseki but instead of giving black a ponnuki from capturing 1 stone, he captures 2 and is much stronger. Also the marked white stone has lost a liberty.


This is a copy of the living page "3-4 point, 5-4 approach, one-space low pincer, separate" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
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