BlindSpot/Problem 4 Solution
Chaz: Plays at a, b, c, and possibly d are the obvious places to play, but is the only solution that kills unconditionally. After , a and c are miai for the kill, along with b and d.
here is probably the best failure. If not for Black's two liberties he would not be able to create double atari with .
White now has to win a ko, which is suboptimal given she can kill unconditionally.
here achieves the same result.
After , a and b are miai for life.