Gokyo Shumyo, Section 2, Problem 4 / Attempts

[Diagram]

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:
[Diagram]


White can play 6 at 7 of course, but then he has a problem:

[Diagram]

White can't push from either direction


Other responses look equally bad:

[Diagram]

White can't push


Black's best resistance is with C18 in my opinion, but nothing seems to work against white B 18.

[Diagram]

--gnostic?


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]

kmr proposition

Typical continuation, black is dead:

[Diagram]

[Diagram]

Black hane

hnishy Good try, but B4 and B6 gets ko. W1 kills only when White can ignore B4.


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]

corner

Other moves.

[Diagram]

corner

[Diagram]

corner

[Diagram]

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]

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]

corner

This 2 looks like best response. White has no chance to kill black, since "a" and "b" will be black eyes.


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