Under The Stones Problem 9 / Solution

[Diagram]

Solution

W1 jumps in.

[Diagram]

Bent four in the corner

If B1 connects, then W2 connects too - and Black dies with a bent four in the corner.

[Diagram]

Solution

So B1 has to cut. Now W2 cuts, and due to shortage of liberties, B3 must capture to gain a liberty before making the atari at B5. W6 captures four Black stones...

[Diagram]

Solution

But the four Black stones is part of Black's under the stones setup, as seen by B1. But what is W2 doing, donating yet another stone?

[Diagram]

Solution

White continues donating stones with W1 and W3, which are promptly captured.

[Diagram]

Solution

However, the final Blow is the throw-in at W1. 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.


This is a copy of the living page "Under The Stones Problem 9 / Solution" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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