Shikatsu Myoki Tsumego Series 76 / Solution
![[Diagram]](../../diagrams/32/df2952c9836e7a2b198ea3841a4a1f28.png)
Original Solution
Note: In Shusai's days, local ko threats must be considered in solving a composed problem. Black has none after
.
![[Diagram]](../../diagrams/9/9b38fedd23e2d9332d29eb675141a281.png)
Reference
In practice, Black may use an outside ko threat and capture the ko at
. After
, it's still a double ko.
![[Diagram]](../../diagrams/30/7557e33adbb6ebe1800a6ad7b2f1c15c.png)
Reference 2
can't prevent the double ko or escape to the left. (Of course, White uses these moves as ko threats to capture the ko in the right.)