Sunday Problem #51

Published 23 May 2021 by antti (last edited 7 Jun 2021)

This is technically an original problem by me, inspired by the recent ngd league game between Sandmann and le_4TC. However, the shape quickly develops into something that also exists in classical tsumego collections.

Black to play.


Try to avoid kō.

Black’s block of 1 is obvious, and so the question is what to do after white 2. Here, the commonsensical hane of 3 fails; after White throws in with 4, Black captures with 5, and White descends with 6, because of the
a weakness the best Black can get is a kō.
After white 2, the correct move is Black’s surprising descent of 3. After this, White cannot get a kō no matter what he tries.

Comments (1)

antti wrote 3 months, 4 weeks ago:

Solution added.