Black must play to save the right half of his group, but can't make two eyes afterward.
Superdave
Black has another try at defense, but this fails. Note that any other allows to live. JoelR
Perhaps isn't needed here as W already has a dead shape inside, resulting in being death in gote. Reuven
Failure: This nearly works. Any other lets White kill. JoelR
Of course at reverts to the correct solution, here. Reuven