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Graded Go Problems for Beginners volume 3 problem 21
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Author:  PeterPeter [ Wed Oct 08, 2014 9:28 am ]
Post subject:  Graded Go Problems for Beginners volume 3 problem 21
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?
Author:  CnP [ Wed Oct 08, 2014 9:57 am ]
Post subject:  Re: Graded Go Problems for Beginners volume 3 problem 21
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.
Author:  1/7,000,000,000 [ Sun Oct 12, 2014 1:08 am ]
Post subject:  Re: Graded Go Problems for Beginners volume 3 problem 21
If white 2 then black captures f19.
Author:  RBerenguel [ Sun Oct 12, 2014 2:48 am ]
Post subject:  Re: Graded Go Problems for Beginners volume 3 problem 21
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
Author:  rat4000 [ Sun Oct 12, 2014 3:34 am ]
Post subject:  Re: Graded Go Problems for Beginners volume 3 problem 21
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
Author:  RBerenguel [ Sun Oct 12, 2014 8:41 am ]
Post subject:  Re: Graded Go Problems for Beginners volume 3 problem 21
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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