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OneSpaceLowPincer

 

One Space Low Pincer Invasion Block
   

[Diagram]
Diag.: basis joseki

Black blocks at 4 if he has a stone around the spot of the marked stone here. Upto black 8 we see a typical joseki: Black makes a wall facing the left, while white gets eyespace and a small amount of territory in the corner. If the marked stone is not present, this variation is bad for black. White then plays in this region herself, and thus effectively reduces the influence of the black wall. The connection 6-8-2 is rather thin, but for white to attack it at once would do more harm than good.




[Diagram]
Diag.: extension

With the combination of white 1 and white 3, white aims at the cut at 5. Black most usually defends this cut indirectly - either by strengthening his position on the upper side, or by closing off the left side like he does here. If white cuts with 5 (often she will wait a while before doing so), he accepts the challenge with 6 (pushing white along the fourth line with black 7 is not good). The moves to white 10 are one possible combination.


[Diagram]
Diag.: the old joseki

The old joseki, which is still played, was for black to defend the cut directly with black 1. The disadvantage of this move is that it leaves the large move of white 2 as aji. If black blocks with black 3 at 8, white has a lot of aji here which might be used to invade black's left-side moyo. But if black draws back to 3 instead, white can make a rather large reduction of his territory in sente.




[Diagram]
Diag.: slightly in disuse

White 4 used to be regarded joseki, but is not played very often any more. The sequence to white 10 is forced, after that black can choose to build thickness with A or fight immediately with B.


[Diagram]
Diag.: influence (6 connects)

After black 1, this sequence is to be expected. White has sente, but black's influence is large.


[Diagram]
Diag.: a favorable fight

If black plays 1, he should not forget the important exchange of black 3 for white 4. After black 7, white is floating in the center, while black is both strong and in a position to make territory on both sides. If white does not answer in the corner, black can get a ko.


[Diagram]
Diag.: not afraid

Black should not be afraid of this white 4. Black can maintain his connection to the outside world, while white still has to come back in the corner.



Author: AndreEngels (2D, Europe) (but feel free to make corrections/additions)



This is a copy of the living page "One Space Low Pincer Invasion Block" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.