Five stones on the third line in the corner

    Keywords: Life & Death
[Diagram]
Five stones on the third line in the corner  

This is the Five stones on the Third line in the Corner position and according to Segoe Kensaku's Go Proverbs Illustrated it is alive as it stands.

If it was not in the corner but on the side it would be the Five stones on the third line its status would depend on who moves first


More recent investigations somewhat dispute Segoe's conclusion, but no final conclusion has been reached yet.

Everything here is therefore to be taken as work in progress not as final conclusions.

We start with an short overview of the most easy variations. under Old page pre WME more variations are found


Table of contents Table of diagrams
Five stones on the third line in the corner
Segoe's conclusion
the vital point?
White ''c''
The descent
White defends

Segoe's conclusion

[Diagram]
Segoe's conclusion  

Segoe's Go proverbs illustrated gives only this diagram to show that this group is alive.

After W4 the group is undeniably alive. But questions are raised about the first move in this sequence

(See also [ext] http://www.lifein19x19.com/forum/viewtopic.php?p=30778#p30778)

Depending on who plays next in this corner White lives with 4 to 5 points of territory


New research for move 1

The recent investigations attack with another B1

Directly to the 1-2 point

[Diagram]
the vital point?  

B1 is at a vital point in this shape. White can try a lot of moves.

The most simple continuation that results in a living group is white c a move that leads to a seki in gote

for the variations following after a, b and d look at the old page below

[Diagram]
White c  

White c results in a seki in gote -- NOT!.

We do not know if Segoe had this in mind. White is alive, but has lost his territory.

And to be honest it is a bit disappointing for White and so this is better for Black than Segoe's conclusion.


The Descent (bad for Black)

[Diagram]
The descent  

An other B1 is the descent but if white takes the vital point with W2 he is alive.


White defends

[Diagram]
White defends  

Although it is still uncertain if White needs to defend this shape W1 followed by W3 are one way to do so. (there are other options) Notice that if black plays continues with B4 and B6 White needs to defend on W7 or any of the points a because after B6 it is a rectangular eight in the corner


See also


Five stones on the third line in the corner last edited by Dieter on January 16, 2013 - 13:56
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
RecentChanges
StartingPoints
About
RandomPage
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Goproblems.com
Login / Prefs
Tools
Sensei's Library