4-4 point low approach, tsukenobi, push into corner
Path: 44PointLowApproachTsukenobi
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Difficulty: Advanced
Keywords: Joseki
![[Diagram]](../../diagrams/8/0d3fc19298b786460f8bce0fb377076c.png) | Tsuke-nobi: The push |
The idea behind is not hard to grasp. For Black to play here would make an excellent shape - White should never allow that. The most obvious way to avoid this is by playing at herself.
next is a solid way of playing. is now necessary to defend against White pushing through and cutting with White a-Black b-White c. White has made a relatively safe group in sente, while Black's corner territory is not small. White next could play tenuki, but if she does choose to play here, she can develop her upper side with d, or attack the black territory at e.
![[Diagram]](../../diagrams/52/f54b1b0628bf836ae92d0d33a123b2b9.png) | White invades |
If White does play at , should be the answer. Defending the corner would be bad: Black cannot expect to win by playing so submissively. The peep with is one possible way to continue. In the continuation, White eats away Black's territory, but Black becomes strong on the outside.
![[Diagram]](../../diagrams/10/b6d66caf0f8228ffb16db2787f0aef12.png) | Extension |
, being on the fourth rather than the third line, makes less eye-shape but works better in the center than White a. Black will still defend at b or . White will probably want to jump out to or some such point quite early, perhaps intending to make a framework on the top.
![[Diagram]](../../diagrams/38/fe3b03582478292fe13266478f2bd4bb.png) | Taking sente |
will start a fight in the center, but White should think twice about playing it, because this fight will most often be to Black's advantage. Black must without fail play the hane atB 4. After White cuts at , Black fixes up his shape with .
![[Diagram]](../../diagrams/1/ec5ab9767d267963860cc21e79a33e18.png) | Game example |
This variant was played by Yoda Norimoto and Cho Chikun in the 1999 Meijin title match. It shows the main problem that White might have in this joseki: In this fight, Black might well be able to build territory on the left side while attacking.
![[Diagram]](../../diagrams/26/dc170ad0e1d3f7ca232ab06285b3a7bf.png) | Even more advantageous? |
After the game, the aggressive move of was proposed. After , the fight seems to be even more clearly in Black's favor.
![[Diagram]](../../diagrams/2/794e8a535f51c7ebf1a1a076d9eb0e31.png) | White extends along the upper side |
Extending along the upper side with is an old-established joseki. Black would do best next to extend far along the left side to . If he already has a stone around this point, he can either strengthen his position there or play elsewhere.
For a thorough analysis of White's threat of pushing at b see 4-4 point low approach tsukenobi, degiri.
Playing at Black a next is not a good strategy. If Black finds himself wanting to play here, he should have played here directly, and not have applied the tsuke-nobi first.
![[Diagram]](../../diagrams/10/8a82a7369c9fe19c05199880356429fc.png) | Tewari analysis |
This tewari analysis shows why: - is joseki, but for Black to attach next at would be a mistake. The exchange that follows strengthens White, while not doing very much for Black's own position. If Black wants to defend the corner after , he can play directly at (or a), but the exchange of and for and is clearly to his disadvantage. Still, the resulting shape is the same as when Black plays at a in the previous diagram - so we must conclude that that move too leads to a bad position for Black.
![[Diagram]](../../diagrams/7/676e0aae8b2d3217c3d3dd9e92d34fa4.png) | White extends along the upper side |
But Black can do even worse. Exchanging for may look like kikashi (a forcing move), but it actually is a thank you move - the only thing Black is accomplishing is that he is helping White to defend her weakness. Now is necessary to defend against the threat of White a. Black has been helping White to an even greater degree than before.
![[Diagram]](../../diagrams/52/dd675887751f40ab42eb5b5bdc8d95bd.png) | The invasion |
The proper way for White to play here and use her aji, is the invasion at here, rather than the push at a. Alternatively, White could play further down, emphasizing the single stone rather than the tsuke-nobi position. Black almost invariably answers at , after which the sequence to is considered joseki, although it is of course not written in stone. is necessary to guard against White b.
![[Diagram]](../../diagrams/12/c6730f1df235fb7c885667d4aa31a07d.png) | Trick play |
Playing instead of in the previous diagram is considered a trick play. If Black plays at , he falls in the trap, and White takes the corner.
![[Diagram]](../../diagrams/3/d68984c0b63fe72f81e2f003c848110e.png) | Foiling the trick play |
is the key move for foiling the trick play. After , White cannot connect her stone in the corner with those on the outside. is now a wasted move.
![[Diagram]](../../diagrams/10/02bbd7b5d33c14d5468b51fc54959da6.png) | Does not work either |
Giving atari from this side does not help White either. prevents White's connection.
![[Diagram]](../../diagrams/30/d579c45ab7378e115027a68d12c69d1f.png) | White keeps the corner |
Gounter:
Is the right move in the previous diagram?
To my 20 kyu eyes, it seems to be on the wrong side: White can live in the corner.
![[Diagram]](../../diagrams/24/b1e72f6cf91d54f9b9f9effd1023de24.png) | White dies |
However on the other side:
if White tries to connect to her stones on the right, she dies.
![[Diagram]](../../diagrams/14/ce59897ab9db3980ae79a98cf3682288.png) | This also fails |
Same result.
![[Diagram]](../../diagrams/26/0f6bea8ee946ca447bf87b4afd1cb38b.png) | Black takes back the corner |
So this way is probably better for White.
Black sacrifices his two stones but takes back the corner.
Your diagrams are correct, but the conclusion which you draw from them is wrong. Having White live in the corner like this is no problem for Black at all. Sure, Black has lost the corner territory, but his gain in thickness is worth much more. On the other hand, your last diagram is not very good for him. Sure, he has kept the corner, but it is only 7 points in size. White's territory at the top is clearly larger. It might be playable for Black because the white stones on the left side are almost dead, but if I had to choose I would not hesitate a moment that the first diagram is better for Black. Black has more thickness and about as many points, White has less thickness and fewer points. - Andre Engels
Authors:
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