4463 enclosure 3-3 invasion

    Keywords: MiddleGame, Joseki
[Diagram]

The 3-3 point invasion with keima

In addition to the hoshi (4-4, star point) there is now BC present.



White invades. Black blocks off the wider side. In this position, making the hanging connection with B6 is a safe, thick move.


W5 above isn't the usual play - White can die here. See 4463 enclosure, for the standard ko variation. Charles Matthews


[Diagram]

The 3-3 point invasion after an approach

This joseki most often arises when BC is a response to WC. In this position, connecting at B6 can be considered almost obligatory.

[Diagram]

Black tries to kill

What happens if Black tries to kill the invasion stones with B6 here?

[Diagram]

Black tries to kill

This is Black's most severe continuation. The fight will depend on the surrounding stones.



Locally, White is dead: after White b, Black c, d and e are miai. Note that B4 cannot be played at a.

[Diagram]

Clamp to escape



Rich: I can't see a good way for Black to stop White sneaking out with the clamp; couldn't this be better than the previous example, depending on surrounding stones?

Charles That's one from Get Strong at Crawl.

Rich: Sometimes better a crawling weasel than a dead lion, no? :) I see the point - if you have somewhere to crawl to, you're probably better off not invading at the 3-3 in the first place,

Charles Depends a bit; but the 4463 enclosure 2-4 approach might sometimes be more useful. Anyway, W5 of the initial diagram seems to be a pro move.


What about this?

[Diagram]

Black blocks

[Diagram]

Black blocks

unkx80: The result should be a ko. See tripod group for a more detailed discussion.


[Joonas Tyystjärvi]: Supposing that the cutting point to the right of B2 is not usable, does this work? It seems to me that after W9, White is alive - are Black's moves correct? (Of course, the result is locally very bad for White.)

[Diagram]

Sacrifice one


I think Black can kill by playing B6 at W7 instead. If Black omits B5, then White a Black b W5 makes life - Andreas

[Diagram]

Placement


Author(s):


This is a copy of the living page "4463 enclosure 3-3 invasion" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.
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