4463 enclosure 3-3 invasion

    Keywords: MiddleGame, Joseki

This page seems to need a WME. Contents in BQM 180 can also be integrated into this page. --unkx80


(Moved from 4463 enclosure.)

[Diagram]

Normal invasion becomes ko

The 3-3 invasion here becomes ko in this main variation; though that's not the whole story.

See [ext] http://www.gobase.org/studying/articles/matthews/ko/part5/ for commentary.

[Diagram]

This is also common.

unkx80: This is also common.



SiouxDenim: A line not covered in the above - how is White supposed to live if Black ignores the ko and plays this B8?

[Diagram]

Ignoring the ko

[Diagram]

Ignoring the ko

Charles Matthews I suppose White has a choice of W1 or a next. Black's play BC seems to reduce Black's possible loss in the ko; but it also must be a concession. In practice it would be hard to kill the corner now: White must have many local ko threats such as b. Black would quite like to exchange Black c for White d, to relieve shortage of liberties around the cutting point (circled point) - but this also helps White form eyes.


[Diagram]

Black tries to kill

This situation is not to be mistaken with 4-4 Point Low Approach Low Extension 3-3 Invasion, W5 here is not the normal move. Because B6 can try to kill the invasion stones.

[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

[Diagram]

Black key points

-William 2d?

'a', 'b', and 'c' (followed by 'd' if white connects) are all more important than taking one stone. When seeking to kill, it is important not to try and separate your opponent's stones. It is better to squish them all together into an area too small to live.

White 5, incidentally, is not that strong. It gives up on the option to descend straight down, or play one to the left. Defending 1 with a hanging connection (for the ko) really is the best white can attempt for move 5. In fact, playing this sooner rather than later may be better -- 3 for 4 might be possible as a ko threat during the fight.


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) 2007 the Authors, published under the OpenContent License V1.0.
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