Solution  

is a double purpose move. It protects the cut at 'a', so now black is aiming at either 'x' or 'y' to kill one of white's groups.

White's resistance  

The purpose of playing is that offers some help when white tries to cut and off from the black group outside.

If at 'a', black 'b' is good enough (see diagram at the end of this section).

White's resistance cont.  

Because of , there's no eye at 'x'; the only chance for white to live is to kill some black stones.

Next, let's look at these white resistances one by one, from 'a' to 'e'.

Resistance 'a'

 

After , white is not able to protect both weakness at 'x' and 'y'.

 

Attempt to connect underneath fails, too. ( at 'y' works, but here is a little better.)

Resistance 'b'

 

doesn't do much in terms of cutting.

Resistance 'c'

 

Black can connect with either 'x' or 'y'.

Resistance 'd'

 

Next black has either 'x' or 'y'.

White 'k' next is also responded by black 'y'.

Resistance 'e'

 

After , white can't get both 'x' and 'y'.

Alternative White resistance

Alternative White resistance: 1  

Here White resists with . After 1, White must protect with 2, otherwise the group on the right dies if Black gets to play at 2. Then Black kills the other group with 3. White's resistance with 4 and 6 doesn't work.

Alternative White resistance: 2  

After 7 in the previous diagram White can't capture the stones as the stones have too many cutting points.

 

Very often is a good move that looks at both sides.

In this case, it doesn't work.

 

In some cases when white is strong around and black is trying to make two eyes, can be a good move that aims at either 'x' or 'y' next.

Failure  

In this variant problem, the main line sequence fails.

Failure  

The position of the stone gave White an extra liberty, so the sacrifice of four White stones from onwards is possible. As a result, Black only managed to capture four White stones.

Solution  

The solution is then to make a placement at first. If blocks, then and enables , capturing the group on the right side.

Solution  

If here, then makes and miai.