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"Patterns of the Sanrensei" by Redmond, move 13
http://prod.lifein19x19.com/viewtopic.php?f=15&t=19581		 Page 1 of 1
Author:  thequietcenter [ Sun Feb 09, 2025 10:23 pm ]
Post subject:  "Patterns of the Sanrensei" by Redmond, move 13
In the move sequence I show here:
https://online-go.com/demo/1412286/13

white a mistake on move 5... however, I'm wondering about move 13 by Black. Why did he form this kosumi? Was it defensive or offensive?

Why not A, B, or C as shown in the diagram?
Author:  Harleqin [ Mon Feb 10, 2025 3:32 pm ]
Post subject:  Re: "Patterns of the Sanrensei" by Redmond, move 13
What can Black do afterwards? There is O13 (d). So White will probably have to somehow defend here now. After a few exchanges Black can play F17 or something, but has probably gained a few more stones facing the upper side and/or the lower centre.

If Black played A (a) instead, White is under far less pressure and maybe has time to play C (c), or at least a somewhat more active move in the centre, e. g. L13 (jump to e).

If Black played B (b) or C (c), White could defend the group more actively, e. g. M15 (f), which limits Black's development at the top. Black would probably even have to answer, because otherwise a White followup at M17 (g) would make the black corner very thin.

Click Here To Show Diagram Code
[go]$$
$$ ----------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . b . . . . . g . . . . . . . |
$$ | . . . O . . . . . a . . . X . X . . . |
$$ | . . . . . . . . . . . f B . . . X . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . . . . . . . . e . O d . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X . . . . . |
$$ | . . . , . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . c . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ----------------------------------------[/go]


(post edited to be self-contained)
Author:  kvasir [ Tue Feb 11, 2025 12:18 am ]
Post subject:  Re: "Patterns of the Sanrensei" by Redmond, move 13
It seems unfair toward the community to post the same question here and on reddit at the same time. At least I think so.

Also, there is no diagram, only a link.
Author:  ez4u [ Tue Feb 11, 2025 12:36 am ]
Post subject:  Re: "Patterns of the Sanrensei" by Redmond, move 13
Is the overall position in the link from Michael Redmond's book? GoGoD has no example from professional play of White playing such an early inside approach. In the Shin Fuseki period there were many people who played on the star point on the left side (about a hundred games). Later people almost invariably approached from the outside (over a thousand games).
Author:  Kyle55 [ Wed Feb 12, 2025 10:33 am ]
Post subject:  Re: "Patterns of the Sanrensei" by Redmond, move 13
I'm still learning, but it looks to me like move 13 by Black was defensive. If Black played A, B, or C, White could potentially cut through and create a weak group. The kosumi strengthens Black's position.
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