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Takemiya Kosumi - Corner Invasion
Path: TakemiyaKosumi   · Prev:   · Next: TakemiyaKosumiTenuki
  Difficulty: Advanced   Keywords: Opening, Joseki

Here are the continuations for Takemiya's Kosumi when White plunges into the 3-3 point straight away.


[Diagram]
Diag.: Corner Invasion Basic Diagram

The basic continuation if White jumps into the corner is for Black to block White off from the center. White connect's her stones, then Black presses with 4. From here White has a choice of extending with a, or pushing with b.



[Diagram]
Diag.: Corner Invasion: Simple Extension

Extending is the simplest continuation for White. She ends up with secure territory and sente. On cannot help but think however, that this is a little submissive and that White is just going along with Black's plans. White may be a little reluctant to allow Black to gain this much thickness. This continuation is not seen very often.



[Diagram]
Diag.: Corner Invasion: Push & Cut

Pushing and cutting with 1 and 3 is an aggressive way of playing that shows fighting spirit. Black next desends with 4. White must take care not to play at a or b yet, otherwise, Black will respond with the wedge tesuji at c. Up to 8 is the usual continuation. Next White should extend to a. b is also possible but it doesn't put much pressure on the black framework.



[Diagram]
Diag.: Push & Cut, White has extension.

If White has an extension like the marked stone in place, the press at 1 is a little more dubious, but still possible. Black should extend to 5, however he should take care. Since White probably played first in the lower left, the ladder is probably not good for him.



[Diagram]
Diag.: Corner Invasion: Block on the other side.

Black 1 is a counter-intuitive play, breaking with the common wisdom that you should block from the side which you have an extension. Black continues up through 10, sealing White off from the right side and gaining powerful thickness along the top side. Black almost never connects at a, instead choosing to take sente, often using it to strengthen his presence on the upper side. The White cut at a is small and Black will probably just ignore it.

White 2 at 8 is a serious mistake - however, Black must respond with 2. The results is gote for White, giving Black a much larger piece of the corner then in the original sequence.

This sequence does end up sacrificing a more than the usual amount of territory for thickness, so Black must be prepared for this when he chooses to block on this side. This variation is not recommended for anyone who does not have confidence in thier ability to use thickness.



Author(s)

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BlueWyvern



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This is a copy of the living page "Takemiya Kosumi - Corner Invasion" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.