XuanxuanQijingProblem150/Solution
![[Diagram]](../../diagrams/47/53d69512f1d6d687f6c14b3b1fbc6f75.png)
Original Solution
![[Diagram]](../../diagrams/35/96bb5bc3ecd4f37276f531bec17e1e30.png)
Original Solution (continued)
threatens a ladder from Black a. If
escapes, the lower group is killed. However...
![[Diagram]](../../diagrams/48/1ba25ec2189922fc718f13d3f40b3bff.png)
Refutation
!! was found in Japan (attributed to Dosaku). This prevents both Black threats.
![[Diagram]](../../diagrams/8/74a0f0bbde30b37fb4e5881257623255.png)
Black's best - ko
Black can play hane at
and make ko.
![[Diagram]](../../diagrams/49/1fece131ae4668e3c5c60922f6720342.png)
Black's best - ko (continued)