Gokyo Shumyo, Section 2, Problem 4 / Attempts

Path: <= Gokyo Shumyo Tsumego Series =>

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:

Other responses look equally bad:

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

--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 ;).

Typical continuation, black is dead:

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.

Other moves.

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?

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)

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

Path: <= Gokyo Shumyo Tsumego Series =>

Gokyo Shumyo, Section 2, Problem 4 / Attempts last edited by hnishy on January 6, 2023 - 01:30

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