Tsumego From Games 20
This came up today in a game. White thought that the group in the corner is alive. Is this so? --unkx80
During the game, Black played
. After
, a and b are miai, and White is killed by shortage of liberties. White resigned soon after that.
provides another path of resistance. However, up to the
, White is dead in bulky five. It does not matter if
is played at
first.
But--
The descent by
is the correct move which both players failed to see. To stop White from connecting underneath Black may play at
, but then
ensures life. After that, a and b are miai.
The real solution is actually the placement at
. The best sequence is from
to
, which results in a rogue ko.
Dieter: the
-
exchange makes it a rectangular six in the corner with one outside liberty. In that case, the 1-2 point makes it ko.
followed by
is yet another variation. Up to
, it is still a ko, but the ko is worse off for White compared to the previous diagram.
Bill Spight: A wonderful position, unkx80!
Because of the throw-in the ko is unusual, but this case has another quirk, thanks to the local ko threat to connect. I'll discuss this further at rogue Ko.
unkx80: Thanks. But shamefully, I was Black.
![[Diagram]](../../diagrams/10/7b7d137aae771a6c7d619394b1d75715.png)
![[Diagram]](../../diagrams/27/b0ad9741d58b5ced96d09203180a315f.png)
![[Diagram]](../../diagrams/1/8e5d566477171d6371eeadfaa94273ec.png)
![[Diagram]](../../diagrams/40/de1578857db9f62f08d9c78eea56656c.png)
![[Diagram]](../../diagrams/26/7a74701c458865ea665d507cf81c642c.png)
![[Diagram]](../../diagrams/24/38434c2c60943d8ba71e2610de0851c1.png)
2024 the Authors,
published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)