Xuanxuan Qijing Problem 310 / Solution
![[Diagram]](../../diagrams/11/6d5e0121e4aeb0e258b453a9e900f52b.png)
Traditional Solution: Kill
at a and White makes a bulky five.
is weak. Instead...
![[Diagram]](../../diagrams/6/52a02585cadbcbd3a8a23c5feebf613b.png)
Panda Sensei analysis
here and
! leads to ko.
![[Diagram]](../../diagrams/13/aa03e705aaddacdfd7d97d3f7b04dfcd.png)
Variation
turn is a mistake. Black lives with
.
![[Diagram]](../../diagrams/27/2eae2453e0f3eeb218705617f722f9c3.png)
Another defense
Go Seigen claims
at a is weak and suggests this line: another ko.
at
.
![[Diagram]](../../diagrams/42/e784c7495e77edfdc7f08196df5022ee.png)
Cont. 1
![[Diagram]](../../diagrams/38/1f7d9b4d6dd2b8ed542f796a9bc19564.png)
Panda Sensei refutes
But
above is a mistake. After
, Black loses the capturing race. Instead,
at
,
or a leads to ko.
![[Diagram]](../../diagrams/32/6a2046588b1ee79145ffb508fcc847a6.png)
Takagi 2
Takagi Shoichi solution 2: ko (partly wrong.
at
is correct, leading to ko)
![[Diagram]](../../diagrams/9/3eb72617279a9b0d121ad678776db892.png)
Takagi 3
Takagi Shoichi solution 3: ko (wrong.
at
kills.)
![[Diagram]](../../diagrams/47/ad325d3d8701cfe26840e9924c3b75e5.png)
Cont. 1
(Note the similarities to the Go Seigen ko)
![[Diagram]](../../diagrams/20/b3e6dd701cf236b336159e8aad9c9fda.png)
All lead to ko
Panda Sensei shows many ways to make ko,
at a to e, with the marked stones added. Variations are complex....