The following is a problem of Cho Chikun's Life & Death Elementary problems nr. 372.
I wanted to ask if I am right that black has a vulnerability here where he can be cut, namely F16. In this situation is it really the right move to kill white?
Cho Chikun's problem nr. 372 - black can be cut
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Kirby
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Re: Cho Chikun's problem nr. 372 - black can be cut
It's a good thing to be concerned about. I don't really feel that it's that dangerous, though.
I guess it could be interesting to think about what happens here:
I guess it could be interesting to think about what happens here:
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Knotwilg
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Re: Cho Chikun's problem nr. 372 - black can be cut
It's a good question and it leads to a higher level argument:
The common technique for capturing is
reducing the eyespace to a bulky five and then 
strike at the vital point. In Black's favor, the usual 8-1=7 internal liberties are now 3 because of the special properties of the corner. In White's favor there's a ko at the outside.
So Black may capture with less aji in this fashion.
But this is deceptive: White can make a ko.
The common technique for capturing is
reducing the eyespace to a bulky five and then strike at the vital point. In Black's favor, the usual 8-1=7 internal liberties are now 3 because of the special properties of the corner. In White's favor there's a ko at the outside.So Black may capture with less aji in this fashion.
But this is deceptive: White can make a ko.
Re: Cho Chikun's problem nr. 372 - black can be cut
To me this sequence seems quite dangerous. The only answer seems to be J18 which is quite unfavorable for black.Kirby wrote:
Re: Cho Chikun's problem nr. 372 - black can be cut
I think the answer to this problem is supposed to be for black to play B18 first.Knotwilg wrote:The common technique for capturing is
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Kirby
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Re: Cho Chikun's problem nr. 372 - black can be cut
My thought is that black can crawl to get liberties, and white won't have enough liberties (if black plays to kill first).mkdrive2 wrote:To me this sequence seems quite dangerous. The only answer seems to be J18 which is quite unfavorable for black.Kirby wrote:
Globally, it could turn out not bad for white, though.
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Re: Cho Chikun's problem nr. 372 - black can be cut
You are right. Black can just capture the white stones before running out of liberties. I guess that answers my question.Kirby wrote: My thought is that black can crawl to get liberties, and white won't have enough liberties (if black plays to kill first).