L & D Series from cyberoro (4K~1K) problem #201

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Loons
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Re: L & D Series from cyberoro (4K~1K) problem #201

Post by Loons »

Rather long:
Click Here To Show Diagram Code
[go]$$Bcm1 Prisoners: W=0, B=0
$$ -----------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . O . O . . . . . . |
$$ | . . . O . . . . O O O . . |
$$ | . . O . X X X X X X . O . |
$$ | . . . , X O O O X , X O . |
$$ | . . O X X O . O X X X O . |
$$ | . O . X O . O . . . c X O |
$$ | . . . X O . a x y . . b . |
$$ ----------------------------[/go]


Heuristically, black must aim at the weakness at a, which white will protect allowing black to make an eye. Kinda cheating to think of it that way, but eh. x and y seem to do that. Because of the ko at b, there's really only kinda half an eye in gote around c. So, trying x -

Click Here To Show Diagram Code
[go]$$Bcm1 Prisoners: W=0, B=0
$$ -----------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . O . O . . . . . . |
$$ | . . . O . . . . O O O . . |
$$ | . . O . X X X X X X . O . |
$$ | . . . , X O O O X , X O . |
$$ | . . O X X O . O X X X O . |
$$ | . O . X O . O . 5 b a X O |
$$ | . . . X O . 2 1 . 4 . 3 . |
$$ ----------------------------[/go]

Black has lots of external liberties, so it seems to work. Good shot in the dark. 2 @ a white seems to die. 4 at 5, 5 at b white seems to have a shortage of liberties.

Click Here To Show Diagram Code
[go]$$Bcm1 Prisoners: W=0, B=0
$$ -----------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . O . O . . . . . . |
$$ | . . . O . . . . O O O . . |
$$ | . . O . X X X X X X . O . |
$$ | . . . , X O O O X , X O . |
$$ | . . O X X O . O X X X O . |
$$ | . O . X O . O 6 7 . 2 X O |
$$ | . . . X O . 5 1 . . 4 3 . |
$$ ----------------------------[/go]

But what if
Click Here To Show Diagram Code
[go]$$Bcm1 Some hijinks
$$ -----------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . O . O . . . . . . |
$$ | . . . O . . . . O O O . . |
$$ | . . O . X X X X X X . O . |
$$ | . . . , X O O O X , X O . |
$$ | . . O X X O . O X X X O . |
$$ | . O . X O . O . 3 . 5 X O |
$$ | . . . X O . 4 1 . 2 . . . |
$$ ----------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bcm1 4 @ 6, 5 @ a
$$ -----------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . O . O . . . . . . |
$$ | . . . O . . . . O O O . . |
$$ | . . O . X X X X X X . O . |
$$ | . . . , X O O O X , X O . |
$$ | . . O X X O . O X X X O . |
$$ | . O . X O . O 2 3 . . X O |
$$ | . . . X O . 6 1 5 4 . a . |
$$ ----------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bcm1 4 @ 8, 7 @9 or 4 @ 7, 5 @ 8
$$ -----------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . |
$$ | . . . . O . O . . . . . . |
$$ | . . . O . . . . O O O . . |
$$ | . . O . X X X X X X . O . |
$$ | . . . , X O O O X , X O . |
$$ | . . O X X O . O X X X O . |
$$ | . O . X O . O 6 2 3 . X O |
$$ | . . . X O . 9 1 5 4 7 8 . |
$$ ----------------------------[/go]


That's a lot of diagram writing, I hope I didn't get mixed up somewhere. I miss anything ?
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Re: L & D Series from cyberoro (4K~1K) problem #201

Post by Magicwand »

impressive!
everyone solving problems rather easily.
from now on i will only post hard problems so people can enjoy more.
"The more we think we know about
The greater the unknown"
Words by neil peart, music by geddy lee and alex lifeson
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