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Big Question Mark Problem 8
Keywords: Life & Death
Looks are very deceiving... It looks as if black is unconditionally alive. But as white 1 hanes and white 3 makes a placement, the aji caused by the marked stone becomes apparent and I believe that black is now unconditionally dead.
BillSpight: Doesn't W 3 kill, too?
unkx80: Agreed. Notice that black can't play at 5 at 6.
Looks like this page needs WikiMasterEditing soon. :-)
With black 1 white answers at 2. Subsequently, 'a' and 'b' are miai. TakeNGive (11k): Looks like not quite miai. If Black 'a', White 'b', then Black 'c' seems to give a seki. (On the other hand, if Black 'b', then White 'a' captures all the Black stones.) Good point ! I give an improved variation below (Maybe the reason why it is better not to number them) --Dieter
... and Black can't play at A because of damezumari. So if he captures the two stones, White kills him at A. DieterVerhofstadt (1k) (Sorry for the mistake, and thank you to Dieter for the correction. However, I never numbered the diagram when I first posted the solution. :-) --unkx80)
Black 1 tries to expand the eye space, but with the ataris at 2 and 4...
...white continues his atari sequence, and occupies the vital point of 4. Black dies of a bulky five shape.
Connecting at 1, and white responds with 2. Then 3 and 4 are also miai.
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 2.
Maybe this variation is not needed? In response to black 1, white cuts at 2 and ataris at 4, capturing the three marked stones.
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.
If black plays 1, white makes a placement at 2 and black suffers the fate of a bulky five.
This way of resistance is also useless. Perhaps the other variations are unnecessary? --unkx80 This is a copy of the living page "Big Question Mark Problem 8" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |