4-4 point low approach, tsukenobi, jump attachment

  Difficulty: Advanced   Keywords: Joseki, Tactics

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Wedge

[Diagram]
[10] The jump in  

W4 is another option in this joseki. It is often used in an attempt to settle the shape. B5 to W8 is then a common continuation.

[Diagram]
Black builds influence  

After B1, W2 is the most common answer, but tenuki and White at B3 have also been played. If White does not play W2, capturing there is a big point for Black as well. B3 is a key point for influence, and should not be omitted.

breakfast (Alexandre Dinerchtein), 1p, told me in a game commentary, that this Joseki is old-fashioned Japanese style. Koreans would go for cash instead (B5 at a in dia. [10]). tderz

[Diagram]
White cuts  

Although the joseki has ended with B5 in the previous diagram (or W4 if there is already a black extension on the left side), White is left with the large move of W1. The difference between White playing here and Black playing a is 22 points. Still, it is only points, and thus considered large yose.

[Diagram]
Black's countermeasure (8 connects)  

On the other hand, White should not wait too long to play W1 in the previous diagram either. If Black's position along the left side is more solid, he could play B4 at W1 here, and try to kill the white stones. If White feels unable to resist this variant, her endgame move is at B1 in this diagram.


[Diagram]
The other atari  

This variant I found in [ext] Jan van der Steen's database and has apparently been played between professionals.



Unfortunately, I do not know what Black would have played, had White run out with B3 instead of W2.

Comment: I don't think White would actually respond in the way shown. It seems to me that B1 is a suicidal move.

Bill: I suspect that B1 is a typo for a play at B3.

[Diagram]
A variation?  

Charles This was played in 1859 by Ebizawa Kenzo against Shusaku, deep in the middle game (around move 100). Looking at the context in that game (the only example in the Gogod database), it seems clear that B1 would have been played only as a sacrifice to take sente for some large-scale play like the circle or square points. It makes no sense, really, as a joseki play relative to the corner.



Hane

[Diagram]
Hane  

Black's second choice after W1 is the hane at B2. W3 and B4 form a very simple variation, after which both players extend with W5 and B6. W5 could also be played at a, and many other possibilities exist for B6.

[Diagram]
Hane  

W3 is the other option in this variation. Black should not omit B6; this is a key point for both players' eye shape. After White extends to W7, Black defends at B8.

Charles Matthews There are not many pro games in which W3 is played, it seems. But the variations there are rather different: B4 at B6 omitting the atari, or B6 at a. I wonder if this line to B8 is more like a 'handicap game joseki.[1] In even games White is also interested in pushing up to b.

[Diagram]
Sacrifice  

White tries to start up a fight with W1 and W3, but Black sacrifices the corner in exchange for extra influence.

[Diagram]
Continuation  

Although White has taken the corner, her territory is surprisingly small - only 15 points or so (White will have to take the black stones off the board). Black's thickness is much more valuable.

[Diagram]
White cuts  

If White cuts with W1 first, Ishida's book gives this variation.

[Diagram]
Continuation  

White manages to capture some black stones, but Black gets a nice amount of territory, and can look forward to a ladder block as well. Of course if the ladder does not work, this variation is even more problematic for White.



Cut

[Diagram]
Cut  

tderz: Black tries this violent cut.
What are White's good replies?
What is the difference if around circle is black+circle, white+circle or empty?


White 3 dan Black 3 kyu DGS, handicap 4, teaching game with comments

[Diagram]
 

tderz: the game above went on like this:
W1 is meant to create some confusion, as Black will have more choices to capture/control the cutting stones white+circle+W1.
B4 is a serious mistake (atari) as it only helps White to get more levy on the right black stones.
Only B6 would have done the same job without helping White.
W7 looks like tesuji to me - at least its fun and worth the experimenting.

[Diagram]
 

tderz: B1: Blocking at Bp5 here had some really interesting variations, which were feasible for Black.
White survived and is not confined and out with W43=W8 and has split.
The result is certainly not bad for White.

[Diagram]
 

tderz: There exists a tesuji which prevents the ladder
(B1=Bp5) W2=Wq5 (threatening white's ladder Wo6)
B3=Bs5! W4=Ws6 (threatens ladder again)
B5=Br6! W6=Wq6
B7=Bq7! .... (White was always forced and Black would have avoided the ladder in sente.

If White then wanted to live in the corner, another ladder could appear on the outside ...
and White had been lost.

[Diagram]
 

tderz: W1 might be useful in the later fight

[Diagram]
 

tderz: Black should die or lose his middle stones if he pulls back with B7=a.

[Diagram]
 

tderz: With W6, White had to be sure to win the semeai (against the center group), if Black choses the option B7-W8-B9,
as it denies White the option to live independently, while Black is alive.


[Diagram]
Unlikely Black response  

Somebody: How about just taking the corner in this fashion?

[Diagram]
sacrifice, closing in  

tderz: I disliked the prospects of a light black sacrifice with B4+B6.

If then a, then black b or c.

[Diagram]
Going for left side  

Somebody: Another option for Black, but White has some territory, can get out and the marked Black stone is placed suboptimally. White a next seems like a big move, as b is sente followup whereas Black b becomes sente only much later in the game.
tderz White a is a big gote move at this stage, at best forestalling (reverse sente]; preventing) black a which threatens really big black c (also limiting to one eye).

[Diagram]
Going for left side  

(2, 7 elsewhere)

Somebody: The marked stone is a bit too close, but if it's played further away White may play otherwise.
tderz: Black got a sente move B2

[Diagram]
Likely result  

Somebody: White got corner profit in sente.


Authors:


[1] Bill: I think you are right, Charles. Rui NaiWei and Jiang Jujo make the point in their recent three volume series, New Joseki Around the World (世界の新定石), that most star point joseki are handicap joseki, and only in recent times, because of the new popularity of star point openings, are new star point joseki emerging with sharp lines of play for both players.


4-4 point low approach, tsukenobi, jump attachment last edited by tapir on November 3, 2010 - 21:36
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