XuanxuanQijingProblem307/Solution
Correct sequence
![[Diagram]](../../diagrams/50/2c7fc51403abd3daaa7fb7f59b69fe3b.png)
Solution: W makes a favorable ko
is the only first move. W takes the ko first here and has a local threat at the marked location.
being the only move for B.
Reasoning
![[Diagram]](../../diagrams/16/ade41bff9550af96c6444839db0544ce.png)
would be wrong
Would result in a miai.
If W is allowed to get
, B can't get two eyes.
![[Diagram]](../../diagrams/31/984b997bf482c994b14dbfc9d0d63952.png)
Wrong attack by W #1
Black can live unconditionally like this (or capture
and the solution sequence follows only
lost the local threat).
Slightly more complex but wrong attack by W
This is the best for both if
is played, B takes the ko first here as opposed to the correct solution where W does.
![[Diagram]](../../diagrams/32/a65813a78760cd542a38e0d67021b7d9.png)
would be wrong.
Alive thanks to the miai.
![[Diagram]](../../diagrams/31/3a844ef5788fc4433fb95e25b3f97d46.png)
would be wrong.
W would take the ko first here (notice this is a direct ko).
![[Diagram]](../../diagrams/11/80620a3706fbfd830de3e931c6359eaa.png)
would be wrong.
Wrong due to the same miai.
![[Diagram]](../../diagrams/12/975a3708cfc6f70c6acd3544b276d52c.png)
would be wrong.
Would revert to the previous direct ko where W takes first.
Back to the ko which B takes first.
![[Diagram]](../../diagrams/4/727507b6cd6019f91dc84d3704e1205a.png)
would be wrong.
Dead.
Bonus Comment - Altered Situations
![[Diagram]](../../diagrams/22/63c536af252f85083d3f54dbe19be777.png)
Altered Situation #1
How do you think the change affect the best sequence?
![[Diagram]](../../diagrams/30/6a8a7874fd996364a690fcd8e78b3824.png)
Altered Situation #2
And here?
![[Diagram]](../../diagrams/40/4ac085b9b0d7c3153a4190d9a745f6b6.png)
Altered Situation #3
What can W gain here?