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Big Question Mark Problem 8
    Keywords: Life & Death

[Diagram]
Diag.: Status ?


Killing Sequence 1 (The Easy One)

[Diagram]
Diag.: The killing sequence 1

Looks are very deceiving... It looks as if black is unconditionally alive. However, the hane at 1 and 3 kills unconditionally.


[Diagram]
Diag.: The killing sequence 1 (continued)

Notice that black can't play at 5 at 6.


[Diagram]
Diag.: The killing sequence 1 (continued)


Killing Sequence 2 (The Harder One)

[Diagram]
Diag.: The killing sequence 2

The placement at white 3 works, too. The aji caused by the marked stone becomes apparent and black is now unconditionally dead.


[Diagram]
Diag.: The killing sequence 2 (continued)

If black connects at 1, white can play the hane at 2 to kill. After black 3 and white 4, black can't play at a because of damezumari. So if he captures the two stones, White kills him at a.


[Diagram]
Diag.: Pitfall

Playing white 2 in the previous diagram at 1 here is wrong. Black sagaris at 2, and then makes a seki with 4.


[Diagram]
Diag.: Variation 1

Black 1 tries to expand the eye space, but with the ataris at 2 and 4...


[Diagram]
Diag.: Variation 1 (continued)

...white continues his atari sequence, and occupies the vital point of 4. Black dies of a bulky five shape.


[Diagram]
Diag.: Variation 2

Connecting at 1, and white responds with 2. Then 3 and 4 are also miai.


[Diagram]
Diag.: Variation 3

Capturing a white stone at 1 is also useless. White can cut at 2, black 3, and white 4, and black is again given the death sentence. If black 3 plays at 4, and white can atari at 3, reverting to Variation 1.


[Diagram]
Diag.: Variation 4

Maybe this variation is not needed? In response to black 1, white cuts at 2 and ataris at 4, capturing the three marked stones.



Other Variations

[Diagram]
Diag.: Variation 1

We shall now consider black's other answers to the hane (the marked stone). Black 1 is a possible move, but white 2 reduces black to a bulky five. If black plays 3, white plays at 4 and a and b are miai. Well, white 4 must never play at a, or else black ataris three stones at c, white d, and black 4 makes two eyes.


[Diagram]
Diag.: Variation 2

If black plays 1, white makes a placement at 2 and black suffers the fate of a bulky five.


[Diagram]
Diag.: Variation 3

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



This page was WikiMasterEdited by unkx80. The old page can be found here.

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This is a copy of the living page "Big Question Mark Problem 8" at Sensei's Library.
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