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Offline PeterPeter
 Post subject: Graded Go Problems for Beginners volume 3 problem 21
Post #1 Posted: Wed Oct 08, 2014 9:28 am 
Lives with ko
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Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------------
$$ | . . O . . O X . a . . .
$$ | . . O X X X O O O X . .
$$ | . . . O O X O b X X . .
$$ | . . . , . X O X . , . .
$$ | . . O . O O X . . . . .
$$ | . . . . . . X . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . , . . . . . , . .[/go]

Black to play and win the capturing race.

A is given as the solution, but what is wrong with B?

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Offline CnP
 Post subject: Re: Graded Go Problems for Beginners volume 3 problem 21
Post #2 Posted: Wed Oct 08, 2014 9:57 am 
Lives in gote
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I think it's because if black 1, then white 2


Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------------
$$ | . . O . . O X . . 2 . .
$$ | . . O X X X O O O X . .
$$ | . . . O O X O 1 X X . .
$$ | . . . , . X O X . , . .
$$ | . . O . O O X . . . . .
$$ | . . . . . . X . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . , . . . . . , . .[/go]


with one possible continuation leading to a ko

Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------------
$$ | . . O . . O . 4 . O 3 .
$$ | . . O X X X O O O X . .
$$ | . . . O O X O X X X . .
$$ | . . . , . X O X . , . .
$$ | . . O . O O X . . . . .
$$ | . . . . . . X . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . , . . . . . , . .[/go]


I could be wrong though and missing some killer sequence.

Thanks for posting the question though btw.

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Offline 1/7,000,000,000
 Post subject: Re: Graded Go Problems for Beginners volume 3 problem 21
Post #3 Posted: Sun Oct 12, 2014 1:08 am 
Dies with sente
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If white 2 then black captures f19.
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Offline RBerenguel
 Post subject: Re: Graded Go Problems for Beginners volume 3 problem 21
Post #4 Posted: Sun Oct 12, 2014 2:48 am 
Gosei
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PeterPeter wrote:
Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------------
$$ | . . O . . O X . a . . .
$$ | . . O X X X O O O X . .
$$ | . . . O O X O b X X . .
$$ | . . . , . X O X . , . .
$$ | . . O . O O X . . . . .
$$ | . . . . . . X . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . , . . . . . , . .[/go]

Black to play and win the capturing race.

A is given as the solution, but what is wrong with B?


I'm not thinking very clearly today (it's incredible how under-sleeping prevents my tsumego reading), but if b, what it white just takes? Seems to be a ko for B to lose after that

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Offline rat4000
 Post subject: Re: Graded Go Problems for Beginners volume 3 problem 21
Post #5 Posted: Sun Oct 12, 2014 3:34 am 
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Nope:
Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------------
$$ | . . O . 4 O X 2 5 3 . .
$$ | . . O X X X O O O X . .
$$ | . . . O O X O 1 X X . .
$$ | . . . , . X O X . , . .
$$ | . . O . O O X . . . . .
$$ | . . . . . . X . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . , . . . . . , . .[/go]

Looks like CnP's two-step ko is the best white gets. Still better than just losing though
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Offline RBerenguel
 Post subject: Re: Graded Go Problems for Beginners volume 3 problem 21
Post #6 Posted: Sun Oct 12, 2014 8:41 am 
Gosei
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KGS: RBerenguel
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Kaya handle: RBerenguel
Online playing schedule: KGS on Saturday I use to be online, but I can be if needed from 20-23 GMT+1
rat4000 wrote:
Nope:
Click Here To Show Diagram Code
[go]$$Bc
$$ +-------------------------
$$ | . . O . 4 O X 2 5 3 . .
$$ | . . O X X X O O O X . .
$$ | . . . O O X O 1 X X . .
$$ | . . . , . X O X . , . .
$$ | . . O . O O X . . . . .
$$ | . . . . . . X . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . . . . . . . . . .
$$ | . . . , . . . . . , . .[/go]

Looks like CnP's two-step ko is the best white gets. Still better than just losing though


Right, I got up to here in some variation, but everything felt too blurry this morning

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