[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Referenced by
SnapbackProblem22

 

Snapback Problem 22 / Solution
Sub-page of SnapbackProblem22

[Diagram]
Happened in the game (Correct solution)

The placement at 1 allows white to capture four black stones in sente or make a break along the first line threatening the life of the whole group.



Attempts and discussion

[Diagram]
Correct move

W1 is the correct move, which captures the four marked stones, threatening a snapback at a.


[Diagram]
Black defeds simply

B2 is a mistake, which loses the whole left-side group. After W9, White wins the capturing race by one move. Even if Black gives up BC, he has suffered a great loss.


[Diagram]
Black defends wisely

Black should just give up his four stones and defend his group as a whole. White gains ten points in sente, though: a great result.

--Dansc

Charles How about B2 at B4?



Dieter thinks there is more to it.

[Diagram]
Correct move

Black loses about 6 points in gote.


[Diagram]
Correct move

This doesn't work, so ...


[Diagram]
Correct move

B4 at B1. Black is killed.


[Diagram]
Correct move

I think this may be the main diagram.


[Diagram]
Happened in the game

I think that placement W1 gives White sente. HolIgor


[Diagram]
One more snapback

B4 connects at W1

If Black persists then there is another snapback.



[Diagram]
White gote

Bill: B2 at a is bad. Simply connecting takes sente.
W1 is better than just threatening to take the BC stones, allowing Black to play at W1.
I believe that this is orthodox play.


[Diagram]
Black surrounded

If Black is surrounded, B2 at W3 dies. In that case, this ko looks like orthodox play, unless Black is komaster.


[Diagram]
Black komaster

When Black is komaster, White continues as in Holigor's line.



This is a copy of the living page "Snapback Problem 22 / Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.