TsumegoFromGames55/Attempts
![[Diagram]](../../diagrams/21/dc8a6578d95972fc43c5746888b48c5a.png)
My attempt
Grauniad: I don't see how White can live after a Black move at the same point.
![[Diagram]](../../diagrams/47/06e9541a79aa2978f692e93eb352fc75.png)
Answer
prevents ko and makes miai of a and b. This and move
are not obvious to me, and I suspect there may be holes in the reasoning.
![[Diagram]](../../diagrams/11/9a8714ca8fb4b9ae8d15acbfaebaa72d.png)
Different Answer
Ed?: White is alive here at 'a' or 'b'.
![[Diagram]](../../diagrams/4/914e5707e5393b63479b1d39a037d959.png)
Different Answer
![[Diagram]](../../diagrams/2/946a3a50ba987eb803bbda2cf373565e.png)
ko
ed?:
here threatens to separate the the white stones by pushing through at
. If the exchange of
for
is not sente then black can kill.
![[Diagram]](../../diagrams/47/7f24b98e5f602da21e9e7fce86dda46c.png)
ko
White throws in with
to make a ko. White will play at either point 'a' to finish the ko.
![[Diagram]](../../diagrams/30/042c07d8136a918ae3ab897836bf0a21.png)
Alternative for black 7
White is alive here.
![[Diagram]](../../diagrams/40/7263837e63fcec1283bb49a43dc1c5ed.png)
Alternative for black 5
White is alive after
![[Diagram]](../../diagrams/11/e81e6cf63733293490542208fe9a3d84.png)
Increasing eye space
If the exchange of
for
is not sente for white black can kill.
![[Diagram]](../../diagrams/3/0ab609ae28d36171769db3b81ba3d4e1.png)
approach ko
Black can get a sente seki by exchanging 'a' for 'b'. Playing 'c' instead leaves open the possibility of a ko. White 'b' in response to 'c' leaves a 1000 yr ko, although if white starts it early by throwing in at 'a' it is a direct ko for white but black will need a lot of approach moves. If black can play 'c' and white tenuki's, black 'b' makes it a direct ko.
This diagram seems to be white's best option.
![[Diagram]](../../diagrams/28/da86a2d57b34dcb4e52a7431cf8f44ff.png)
Playing underneath 1
Here white dies.
at
would give ko after black pushes through at
.
![[Diagram]](../../diagrams/15/0c7a975ea5fe5f06e77b87731a7b73d0.png)
Playing underneath 2
'a' and 'b' are miai so white must fight the ko
![[Diagram]](../../diagrams/52/afe0eeb62ea0cf4a4319868d57d7d060.png)
Not clever
Resisting with
is clearly bad, white collapses.
![[Diagram]](../../diagrams/4/c98780b87c00a3b0e09c7126f179f211.png)
Seki
This attack leads to seki.
at 'a' would lead to ko. Again white is dead if the exchange of
for
isn't sente.
![[Diagram]](../../diagrams/10/f8ae4167eb4d08a7069db965fc862a1e.png)
Seki
If
at
then white lives with territory at 2.
(Hicham): Isn't 4 atari?
Ed? True white needs to exchange 'a' for 'b' before playing