![[Diagram]](../../diagrams/29/3c81e3d2eaae913842ec60eadc279180.png)
Solution: Attach-Descend
and
- this sequence is an often seen technique to expand the eye space for making life. Black is guaranteed two eyes at a and b.
(For advanced readers: usually, White should keep his options of c or d open. It is also a good ko threat.)