[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Aliases (info)
KeimaWatari

Paths
ElementaryMoves1

Referenced by
Keima
DroppingBack

 

Connecting with keima
    Keywords: Tesuji

[Diagram]
Keima

GoranSiska - Here Black 1 - keima in relation with the two marked stones - is a tesuji for safely connecting the two groups.


[Diagram]
Example from pro game

In the third game of the 2003 Kisei, Yamashita Keigo plays 1, applying a variant of this tesuji. a and b are now miai for the connection. If White 1 at a, ...


[Diagram]
Example from pro game

... Black forces and captures three stones.


[Diagram]
Ladder(s)?

Charles Matthews I see several possible ladders here for White, after White 1 to White 5. If Black 6 connects, White can get parallel ladders with White a, Black b, and then White c, or White d, Black c, White e - and there's more where that came from. Obviously since the marked white stones have just two liberties, a net is a failure.

Or White 1 at 2, naturally, but isn't squeezing better style?

So - all these ladders were broken?

Dieter:Sorry. All ladders work for White. White is very strong in the center. So in this case, her move works. Bad example. To continue: It is beyond my capability to judge the global position for the different choices you mention, I just wanted to point out the local issue.

JanRamon: If white relies on ladders, there's always the Aji of ladder breakers, and any attempt of the black stones to escape is sente because the three white stones can be captured. So in the game white just safely connects and takes territory while blacks center stones struggle to live.


[Diagram]
Ladders unnecessary

White does not need the ladders at all. Even if all ladders to the lower right are broken, white can capture the black stones easily using this sequence. This is better for white than the sequence in the previous diagrams, because he does not have the ladder breakers to worry about - Andre Engels


[Diagram]
And the next question is ...

Charles Matthews So, now I'd like to ask what happens if Black plays 1 here?


[Diagram]
And the next question is ...

? Dieter


[Diagram]
And the next question is ...

? Dieter


[Diagram]
Better?

Charles I think White 2 must be correct, but it takes a little reading. The point is probably that Black a can be answered by White b.

Andre Engels: Yes, Dieter's second answer and Charles's answer are correct. After white 2, c and d in Charles's answer are mi-ai, both ensuring a connection. Dieter's first answer is riskier and leaves more aji, for example note that a black move at 4 in that diagram is sente against the three stones below.


[Diagram]
Better ?

I think I still choose the shape move, though it loses territory. Dieter


[Diagram]
Tactical point

Charles Just to explain a hidden tactic: Black 4 here prevents an immediate atari by White, and Black 6 creates a ko. This is big for Black, but not necessarily enjoyable.



[Diagram]
Example from pro game

dnerra: I'd suggest this line as a refutation of White 1. Unless white wants to give up on the stones on the left, she has to play 3 (ugh), 5 (oh dear) and 7 (horrible as an exchange with 6). Compared to the game move, white has a little more territory, but black got two full moves on the outside.

(And I don't think White 3 at 4 can lead to a good result if Black pushes at a.)



This is a copy of the living page "Connecting with keima" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.