makes miai of a and b. At the same time, it protects against a placement at c. The shape composed here, recurs in problems 18 and 34. I'll call it the OkiWantsIkkenTobi for now.
White makes a placement at , but Black calmly takes the miai point at
. White seemingly connects underneath, but Black has the throw in tesuji at
. White captures, next ..
White is in shortage of liberties. Look how helps.
Variations later. Feel free to add some of yourself.
KarlKnechtel: Here's one:
Black thinks himself clever for making an eye at a, and keeping the stones on the right connected via a bamboo joint. But when White probes, Black effectively has six on the second line in gote, and so the double hane and the placement at kill. I think.
If Black doesn't defend the cut, there are some other possibilities. One is the descent, trying to claim a second eye:
White calmly makes the placement at , and Black still can't profit by extending the eye space - the hane this time leaves black with a filled farmer's hat big eye.
The other is to secure the eye at a and hope for another at b or c:
I'm not sure how to refute this, since d and e seem to be miai for life. Maybe is wrong?
unkx80: Black lives here. is wrong.
unkx80: White has to play at , threathening to connect at a.
Black's strongest play is at , threatening to make an eye in the corner. If
plays at a, Black can make a nasty ko at b.
to
attempts to create a seki. However,
is a tesuji that will kill Black.
and
try to make a bent four.
But the placement at kills the entire black group. If
carelessly plays atari on the five black stones at a, Black lives at
instead, with the under the stones technique.
KarlKnechtel: For completeness, note Black cannot live via under the stones by sacrificing six stones either:
White is forced to capture at (!) because otherwise Black captures at a and has two eyes. Black tries to continue via standard under the stones technique, but ends up almost filled with a dead shape (there is no need to force the issue with a play at a because of this filling):
Problem 37
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