Gokyo Shumyo, Section 2, Problem 4 / Attempts
xela: White 'a' next and black is short of liberties.
- This in my opinion refutes B 15 as white's response, but then again so does C 17. I do believe this is the correct first move, but we need a correct 'main line' to go into the solution. Here's what I've got:
White can play 6 at 7 of course, but then he has a problem:
![[Diagram]](../../diagrams/27/fc77a085b9f8ad227225992d9929fb49.png)
White can't push from either direction
Other responses look equally bad:
![[Diagram]](../../diagrams/20/5ec4b0abcd5a78cea38381ce1857e004.png)
White can't push
Black's best resistance is with C18 in my opinion, but nothing seems to work against white B 18.
This 1 below (diag "kmr proposition) looks like work too, however if Hnishy did not called this problem unsound cuz of duals, i guess it does not work ;).
![[Diagram]](../../diagrams/19/b258a00369764b0dcc9da06d1c3df6b6.png)
kmr proposition
Typical continuation, black is dead:
![[Diagram]](../../diagrams/36/dce481e4f6806a71d8da97849a9d1ff0.png)
Black hane
hnishy Good try, but
and
gets ko.
kills only when White can ignore
.
White's 1 move is the key. [ kmr - Which white 1 is key? in diagram called "corner" below? This 1 looks like huge mistake, must be some typo]
Black then may respon with any number of moves, but it is futile if played correctly.
![[Diagram]](../../diagrams/14/d76c83fbad623afc7ca4f03513a4c552.png)
corner
Other moves.
![[Diagram]](../../diagrams/3/335d86afccab29726ef1f09bd2c6c80c.png)
corner
![[Diagram]](../../diagrams/11/d7d750699e3f78da5b70d9e61b146ac5.png)
corner
![[Diagram]](../../diagrams/18/acefd70b59dede1dd94f1cabe149d418.png)
corner
LukeNine45: This is ko after Black at a next, no? Can you refute the solution given at attempts?
LukeNine45: Also what are the refutations to the two natural responses?
![[Diagram]](../../diagrams/46/62ee507a8a1f654464799926d7d10566.png)
corner
This 2 looks like a bit risky. White can occupy vital point at "3" and maybe he can achieve sth. For example sequence qbove gives 2 step ko ("a" and "b" are next moves)
![[Diagram]](../../diagrams/39/dfb94c0b8ed848e5b9e85dc4fefe3e67.png)
corner
This 2 looks like best response. White has no chance to kill black, since "a" and "b" will be black eyes.