BQM 8

The killing sequence 1  

Looks are very deceptive... It looks as if Black is alive. However, the hane at , and , kill unconditionally.

The killing sequence 1 (continued)  

Notice that Black can't play at at .

The killing sequence 2  

The placement at works, too. The aji caused by becomes apparent and Black is now unconditionally dead.

The killing sequence 2 (continued)  

If Black connects at , White can play the hane at to kill. After and , Black can't play at a because of shortage of liberties. So if he captures the two stones, White kills him at a.

Pitfall  

Playing in the previous diagram at here is wrong. Black descends at , and then makes a seki with .

Variation 1  

tries to expand the eye space, but with the ataris at and ...

Variation 1 (continued)  

...White continues his atari sequence, and occupies the vital point of . Black dies with a bulky five shape.

Variation 2  

Black connects at , and White responds with . Then and are also miai.

Variation 3  

Capturing the white stone at is also useless. White can cut at , , and : and Black is again given the death sentence. If plays at , and White can play atari at , reverting to Variation 1.

Variation 4  

Maybe this variation is not needed? In response to , White cuts at and plays atari at , capturing the stones.

Variation 1  

We shall now consider Black's other answers to the hane (the marked stone). is a possible move, but reduces Black to a bulky five. If Black plays , White plays at ; and a and b are miai.

Well, must never be played at a, or else Black plays atari on three stones at c, White d, and makes two eyes.

Variation 2  

If Black plays , White makes a placement at and Black suffers the fate of a bulky five.

Variation 3  

This way of resistance is also useless. Perhaps the other variations are unnecessary?