BQM 251
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.
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
-
is a very bad ko for Black (White takes first)
tderz: the threat to escape to the center/edge is usually understood as a solution for Life in TsumeGo.
Dave:
in the previous diagram looks like a mistake to me. Just extending to
seems to ensure life for Black.
HermanHiddema: Does this escape threat actually work? I think black will have to play
in the previous diagram one line lower to escape.
tderz: If White choses m, Black lives. White can also chose to fight for the ko-connection at n after
in the diagram below.
This ko is much better for Black as he took first.
tderz: Alleged internal ko threats black d+e do not seem to work, as White would connect the ko at
, 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.
Alainwettach: Maybe there is one other move to try
Alainwettach: in this variation, B seems alive with double ko if he throws in at a after w captures 9.
Herman Hiddema: This way, black wins the semeai, so apparently the marked move allows black to escape.
Dave: I think there is no escape for Black here. Black still has only ko although a is now an internal ko threat for Black.
Herman Hiddema:
should be at
, then black still wins the semeai
Dave: In theory White can still make ko with
. But when White also has to play to stop the escape, Black ends up with a large number of internal ko threats starting with a.
unkx80: To be pedantic, I would even say that Black can live by double ko. After
, Black either wins the ko on the left side by capturing at a, or wins the ko on the right side by capturing at b and then c. Also, White d may be answered by Black e. (If
at
, then Black plays at a for a snapback.)
![[Diagram]](../../diagrams/9/ee9a15e6595ed6924c7c9d69d3e90691.png)
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seems to ensure life for Black.
![[Diagram]](../../diagrams/10/80e55528c885e7e6073cb3f500ed4556.png)
![[Diagram]](../../diagrams/7/e69ada0fe301cc4779bfcccf74062bc8.png)
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at ![[Diagram]](../../diagrams/10/24b11cd7162fdece81699c0e0c379782.png)
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