Snapback Problem 22 / Solution

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.

Correct move  

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

Black defeds simply  

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

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 at ?

Correct move  

Black loses about 6 points in gote.

Correct move  

This doesn't work, so ...

Correct move  

at . Black is killed.

Correct move  

I think this may be the main diagram.

Happened in the game  

I think that placement gives White sente. HolIgor

One more snapback  

connects at

If Black persists then there is another snapback.

White gote  

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

Black surrounded  

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

Black komaster  

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