Xuanxuan Qijing Problem 298 / Solution
Solution
After , the best Black can do is getting a ko with a.
at b , c, or d doesn't work.
Resistance 'a'
Ko for life.
Resistance 'b'
Black can't capture .
Resistance 'c'
Black needs both x and y.
Failure
Other doesn't work; Black has x or y to make two eyes.
After Black can tenuki.
.