Forum for How To Attack

One diagram [#1093]

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Unkx80: One diagram (2007-08-07 00:10) [#3728]
[Diagram]
corner  

One of the diagrams have W4 played at a. While thick, it looks somewhat passive to me. You may consider W4 here instead.

[Diagram]
Pro game  

I recall reading somewhere where the attachment of B1 is described as a "winning move", because it makes White heavy. Can't remember the surrounding stones of this pro game though.

X
Bill: Re: One diagram (2007-08-06 04:53) [#3743]

I found this game on Go Base. Kajiwara played the attachment at B1, but White, being Ishida, did not make heavy shape. ;-)

[Diagram]
Ishida Yoshio (W) - Kajiwara, 1978  



[Diagram]
Ishida (W) - Kajiwara, 1978 (cont.)  
Unkx80: Re: One diagram (2007-08-06 13:40) [#3744]

Thanks for the pointer. Apparently, the book 九段的感觉 (ISBN: 7-5009-1090-8) is unreliable here.

LukeNine45: Re: One diagram (2007-08-06 18:29) [#3746]

Nice example!

LukeNine45: Re: One diagram (2007-08-06 18:18) [#3745]

Ah, good idea, thanks!

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LukeNine45: I added this... (2007-08-06 18:45) [#3747]
[Diagram]
Ishida Yoshio (W) - Kajiwara, 1978  

Note that black+circle and B1 both have nearby supporting stones! As in the san-ren-sei example above, black+circle is the attacking stone. B1 is an attempt to make white heavy.


I'm sure I'm missing a ton of subtleties with B1-- but can one of you verify that this is a valid way of thinking of B1 (at least for the target audience of this page)?

X
Bill: Re: I added this... (2007-08-06 19:12) [#3748]

Aside from being a 9 dan, Kajiwara is an original thinker. I hesitate to guess what he was thinking about.

[Diagram]
Ishida Yoshio (W) - Kajiwara, 1978  

But since you ask, . . . ;-) If he plays B1, the white+circle stone blocks the natural development of the corner enclosure. Also, if White runs out, Black may have to worry about an invasion at a. Maybe Kajiwara expected something like what happened, to trade the corner for thickness and sente. He did win, after all.

LukeNine45: Re: I added this... (2007-08-06 20:19) [#3749]

Thanks, I changed the text to the more neutral, "As in the san-ren-sei example above, black+circle is preventing white from making a base in that direction." That much seems to be objectively true. :)

Unkx80: Re: I added this... (2007-08-06 23:59) [#3750]
[Diagram]
 

FYI: The book I cited above shows this sequence, saying that White encroached into Black's territory and escaped, and so it is not good for Black. Seems a reasonable assessment to me.

 
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