Xuanxuan Qijing Problem 247 / Solution
![[Diagram]](../../diagrams/7/fd9a97d1d304beb70c3455cc5b2926b4.png)
Original Solution
This is the original solution, killing unconditionally.
and
can be switched. However
at a lives.
and
should be switched.
![[Diagram]](../../diagrams/43/05008cf516c8779aa90d15ef4e47fe3e.png)
Improved solution: ko
Ko is the best result for both sides.
![[Diagram]](../../diagrams/33/7c8402dbc939b7b7ef91b38ac9d788c0.png)
Failure
first is a mistake. White is alive after
.