@ 4. @ a.
With and , white creates semedori. Since black is only one liberty ahead, he must capture these stones immediately. Then White plays at a to secure .
Referenced bySemedori
![[Diagram]](diagrams/9/04f844f2d47d944d2d11c2e01fcd9dbb.png)
![[Diagram]](diagrams/26/bd4577b97cb1111143cb830f41fc5d74.png)
@ 4. 
@ a.
and 
, white creates semedori. Since black is only one liberty ahead, he must capture these stones immediately. Then White plays at a to secure 
.
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