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
Segoe's Go proverbs illustrated gives only this diagram to show that this group is alive.
After the group is undeniably alive.
But questions are raised about the first move in this sequence
(See also 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
Directly to the 1-2 point
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
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)
Although it is still uncertain if White needs to defend this shape followed by
are one way to do so. (there are other options)
Notice that if black plays continues with
and
White needs to defend on
or any of the points a because after
it is a rectangular eight in the corner
See also
-
Discussion over this shape with other variations on Life in 19 x 19
- RTGProblem85, RTGProblem86, RTGProblem87
- Four stones on the third line in the corner