Under The Stones Problem 9 / Solution

Solution  

jumps in.

Bent four in the corner  

If connects, then connects too - and Black dies with a bent four in the corner.

Solution  

So has to cut. Now cuts, and due to shortage of liberties, must capture to gain a liberty before making the atari at . captures four Black stones...

Solution  

But the four Black stones is part of Black's under the stones setup, as seen by . But what is doing, donating yet another stone?

Solution  

White continues donating stones with and , which are promptly captured.

Solution  

However, the final Blow is the throw-in at . The ending is a ko for life for Black.

In this problem, it turns out that not only Black uses the under the stones technique. What is so magical is the way White sacrificed stones again and again. In fact, to answer the question posed in the hint, a total of ten White stones were captured in the main line.