Short J Group

    Keywords: Life & Death
[Diagram]

Short J group

The short J group is actually a tripod group followed by the white+circle- black+circle exchange. It is alive as it stands. A White stone around a makes it unsettled, however. Playing black+circle at b is a wrong and leaves the group unsettled.

It should not be confused with the J group.


Table of contents Table of diagrams
Short J group
Attemp 1
Attemp 2
Attemp 3
Attempt 4
Attempt 4, alternative
Mistake after follow-up 4
Straight Short J group
[Short J group with extra leg]
An extra White stone on the upper side
continuation

Alive

[Diagram]

Attemp 1

If W1 blocks, then B2 lives.

[Diagram]

Attemp 2

If W1 makes a placement here, then B2 hanes. W3 and B4 are miai for life.

[Diagram]

Attemp 3

The descent at W1 is answered by B2 as well.

[Diagram]

Attempt 4

W1 and W3 is probably the strongest attack, threatening a ko. The throw-in at B4 is neccessary for life. The result is oshitsubushi.

[Diagram]

Attempt 4, alternative

If W5 captures, then B6 and B8 lives by oshitsubushi as well.

[Diagram]

Mistake after follow-up 4

B4 here would be a mistake, because W5 turns the whole group into a ko.


The straight Short J group

[Diagram]

Straight Short J group

If black+circle is as in this diagram (instead on a) as before than white can kill with the eye-stealing tesuji of W1, making a placement and aiming at setting up a snapback at b. Black is dead.


Short J group with extra leg

While the short J group is alive black must be careful not to play the B1 - W2 exchange and then play tenuki the group now becomes unsettled see Short J group with extra leg for details


An extra white stone on the upper side

[Diagram]

An extra White stone on the upper side

Black most also be careful when White has played at white+circle if he does nothing While can kill him with White a

TO ADD what is blacks best defence

If White has a stone at at b white needs to play a (see attempt 1 above)

TO ADD what about White c

[Diagram]

continuation

After white+circle, W1 and W3 reduce the corner to one eye and although W5 can be captured (Black a White b it is only a false eye.



This page is mostly coming from the page of the tripod group I is because another page the tripod group with extra leg is not really a tripod group at all. It is a short J group (with an extra leg)


This is a copy of the living page "Short J Group" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
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