One Thousand and One Life-and-Death Problems / Problem 75 discussion
White gets , , and at one of the points; a total of three ko threats.
A question was raised: Is also a solution? The answer is given below.
This fails. White plays and the shape is dead. If at any time Black captures the four White stones with , then kills (Black cannot make two eyes due to damezumari).
looks fancy, but it fails because of the same reason ( at ).