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44PointLowEnclosure

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EnclosureTechniques

Referenced by
JosekiQuickReference
FutureUseOfSL
4463Enclosure25Ap...
UnusualEnclosures
EnclosureJoseki
BQM21LowerRight
TheNineStandardEn...
33PointWhenDoesIt...
44PointEnclosures
JosekiNomenclatur...
44PointLowApproac...
4463Enclosure34Co...
ReadyReckoner
44PointEnclosureJ...
4463Enclosure24Ap...
44PointVeryLowApp...
4463Enclosure33In...
CharlesLosslessNo...
443563Enclosure
44PointEnclosureV...

 

4463 enclosure
Path: EnclosureTechniques   · Prev: LargeHighShimari   · Next: 4464Enclosure
    Keywords: Opening, Ko

[Diagram]
4463 enclosure

This enclosure is in frequent use in contemporary go. It emphasises territory more than the 4473 enclosure does.


[Diagram]
Normal invasion becomes ko

The prime reason for saying that is the fate of the 3-3 invasion W1.



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.


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

SiouxDenim


[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.



There are a number of other standard invasion techniques:

Also commonly used is the shoulderhit reduction:

[Diagram]
Reduce with the shoulderhit

Black's answer's at a and b both leave a little to be desired, so W1 may (if well-timed) successfully prevent Black building a framework on a large scale here. Naturally, if Black intends to build in the centre, it would be more consistent to make the initial enclosure with a fourth line play (4464 enclosure, 4474 enclosure).



White may also simply play the ordinary approach move, setting up a tenuki joseki position. There are a number of ways for Black to play, depending of course on the whole framework.

[Diagram]
Diagonal attachment

This diagonal attachment B2 has its own discussion at 4-4 point low approach low extension, tenuki.


[Diagram]
Pincer

After B2 played as a pincer the exchange White a - Black b doesn't give White a proper base, so White is somewhat heavy here (position discussed at 4-4 point low approach low extension, slide, pincer, tenuki). Therefore White normally plays at one of the circled points.


[Diagram]
Footsweep

In other circumstances the footsweep B2 is designed to attack White's base on the outside while taking the corner.


[Diagram]
Closing the corner

Black may simply opt to take the corner with B2 here.


[Diagram]
Other options

If the direction of play is to favour the upper side, Black may also play at a or b.



Path: EnclosureTechniques   · Prev: LargeHighShimari   · Next: 4464Enclosure
This is a copy of the living page "4463 enclosure" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.