GokyoShumyoSection4Problem30/Solution
![[Diagram]](../../diagrams/7/ba765e72bbbd23e2a09c48b8737a4860.png)
normally increases one liberty
After
, White a is met by b, c by d, and e also by d. No hope?
![[Diagram]](../../diagrams/31/ee18f220d301c223c4d7f93e486b5754.png)
Big Ko
is the beautiful counter. Ko is the answer. (In practice, White may well play at a and d above, sacrificing the center and living the corner in sente.)