BQM 251

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[Diagram]

black to play and live

xela: This is problem 334 from volume 4 of Graded Go Problems for Beginners.


[Diagram]

solution

This is the answer given in the book.


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can black live unconditionally?

My question is: what happens if white plays this way instead?

Now if black plays 'a', white replies at 'b' for ko. If black 'c' instead, then white 'd'. Does black have a better move?

Dieter: I can't refute it.


[Diagram]

Ko?

tderz: at present I see nothing better than a ko.
Sometimes black moves at d gain an edge by hampering white's underneath connection, but white seems to destroy then all the eyes from the left.
This ko B3 - B7 is a very bad ko for Black (White takes first)

[Diagram]

Ko?

tderz:


[Diagram]

the threat to escape

tderz: the threat to escape to the center/edge is usually understood as a solution for Life in TsumeGo.


[Diagram]

Ko?

tderz: If White choses m, Black lives. White can also chose to fight for the ko-connection at n after B3 in the diagram below.
This ko is much better for Black as he took first.

[Diagram]

Ko?

tderz: Alleged internal ko threats black d+e do not seem to work, as White would connect the ko at W3 , then live with f.
Even if this life was not possible black needs too many approach moves (5 = g+h+f+c+i) while Black has only 4 liberties p-q-r-s on top.

[Diagram]

Ko? - Life! - dream sequence


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Ko?

tderz: Of course White connects the ko, lives herself and kills white.


[Diagram]

ko

tderz: Concluding from above, it seems that this ko has t be fought.

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ko

tderz: This is a good ko for Black as he took first.

[Diagram]

life from here

tderz: threatening with a only leads to ko b.
Connecting at b lives from here.

[Diagram]

life


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This is a copy of the living page "BQM 251" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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