BQM 8

  Difficulty: Advanced   Keywords: Life & Death, Question

Table of contents Table of diagrams
Status?
The killing sequence 1
The killing sequence 1 (continued)
The killing sequence 1 (continued)
The killing sequence 2
The killing sequence 2 (continued)
Pitfall
Variation 1
Variation 1 (continued)
Variation 2
Variation 3
Variation 4
Variation 1
Variation 2
Variation 3

Problem

[Diagram]

Status?


Killing Sequence 1 (The Easy One)

[Diagram]

The killing sequence 1

Looks are very deceptive... It looks as if Black is alive. However, the hane at W1, and W3, kill unconditionally.

[Diagram]

The killing sequence 1 (continued)

Notice that Black can't play at B5 at W6.

[Diagram]

The killing sequence 1 (continued)


Killing Sequence 2 (The Harder One)

[Diagram]

The killing sequence 2

The placement at W3 works, too. The aji caused by white+circle becomes apparent and Black is now unconditionally dead.

[Diagram]

The killing sequence 2 (continued)

If Black connects at B1, White can play the hane at W2 to kill. After B3 and W4, Black can't play at a because of shortage of liberties. So if he captures the two stones, White kills him at a.

[Diagram]

Pitfall

Playing W2 in the previous diagram at W1 here is wrong. Black descends at B2, and then makes a seki with B4.

[Diagram]

Variation 1

B1 tries to expand the eye space, but with the ataris at W2 and W4...

[Diagram]

Variation 1 (continued)

...White continues his atari sequence, and occupies the vital point of W4. Black dies with a bulky five shape.

[Diagram]

Variation 2

Black connects at B1, and White responds with W2. Then B3 and W4 are also miai.

[Diagram]

Variation 3

Capturing the white stone at B1 is also useless. White can cut at W2, B3, and W4: and Black is again given the death sentence. If B3 plays at W4, and White can play atari at W3, reverting to Variation 1.

[Diagram]

Variation 4

Maybe this variation is not needed? In response to B1, White cuts at W2 and plays atari at W4, capturing the black+circle stones.


Other Variations

[Diagram]

Variation 1

We shall now consider Black's other answers to the hane (the marked stone). B1 is a possible move, but W2 reduces Black to a bulky five. If Black plays B3, White plays at W4; and a and b are miai.

Well, W4 must never be played at a, or else Black plays atari on three stones at c, White d, and B4 makes two eyes.

[Diagram]

Variation 2

If Black plays B1, White makes a placement at B2 and Black suffers the fate of a bulky five.

[Diagram]

Variation 3

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


See also:


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