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 black+circle, 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 black+circle 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.


Snapback Problem 22 / Solution last edited by HolIgor on September 3, 2004 - 09:24
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