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White to kill

https://www.lifein19x19.com/viewtopic.php?t=17201

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White to kill

Posted: Tue Jan 14, 2020 4:24 pm
by Gomoto
White to continue and kill the lower left:
Or not?
Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . O X X . . X . . . . O . O . . . . |
$$ | . . X O O X . . O . O . . O X O O . . |
$$ | . . O O . X . . . O . X X O X X O . . |
$$ | . . . . . . . . X O X . . X X X X O . |
$$ | . . O . . X . X . O O X X O . X O X . |
$$ | . . . . . . . . O O X X . . . X . . . |
$$ | . . . . . O X X O X . X . O O X . . . |
$$ | . . O O . O O X X . X . . . X . X . . |
$$ | . . O X O . . O X X X . O O X X . O . |
$$ | . . O X O X . O . O . X . X O X O . . |
$$ | . . O X X O . . . O O O X X O O O . O |
$$ | . X O X 1 . . O . X O O O X O . . O X |
$$ | . . X 2 . . . O X . X O X X O X O X X |
$$ | . . . X X X . O . . . X . X O . O O X |
$$ | . . . , O X O . . , . . X O O , O X X |
$$ | . X X O . O X X X X X . X X X X X X . |
$$ | . O O . . . O O O O . . X O X . . . . |
$$ | . . . . . . . . . . . O O . . . . . . |
$$ +---------------------------------------+[/go]

Re: White to kill

Posted: Tue Jan 14, 2020 5:56 pm
by Uberdude
3 is shape intuition and seems to kill. Black can make one eye in sente in centre with a-f. 7 is the key move, my first idea (actually before that was C4 before I noticed 4 sente) was hane A3 but that's a mistake as it allows a6 sente to make the second eye
Click Here To Show Diagram Code
[go]$$Wc
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . O X X . . X . . . . O . O . . . . |
$$ | . . X O O X . . O . O . . O X O O . . |
$$ | . . O O . X . . . O . X X O X X O . . |
$$ | . . . . . . . . X O X . . X X X X O . |
$$ | . . O . . X . X . O O X X O . X O X . |
$$ | . . . . . . . . O O X X . . . X . . . |
$$ | . . . . . O X X O X . X . O O X . . . |
$$ | . . O O . O O X X . X . . . X . X . . |
$$ | . . O X O . . O X X X . O O X X . O . |
$$ | . . O X O X . O . O . X . X O X O . . |
$$ | . . O X X O b . . O O O X X O O O . O |
$$ | . X O X 1 a . O . X O O O X O . . O X |
$$ | . 6 X 2 f . e O X . X O X X O X O X X |
$$ | . 3 . X X X c O . . . X . X O . O O X |
$$ | 7 . . 4 O X O d . , . . X O O , O X X |
$$ | . X X O 5 O X X X X X . X X X X X X . |
$$ | . O O . . . O O O O . . X O X . . . . |
$$ | . . . . . . . . . . . O O . . . . . . |
$$ +---------------------------------------+[/go]

Re: White to kill

Posted: Tue Jan 14, 2020 6:26 pm
by Kirby
The sequence I thought of was similar to Uberdude’s, except a little bit worse: I had :w7: at b4 instead of a4. But it doesn’t work since black can use a6 on sente..

Re: White to kill

Posted: Tue Jan 14, 2020 6:58 pm
by Bill Spight
I did not see how Black to play could kill White. :oops: :lol:

Re: White to kill

Posted: Tue Jan 14, 2020 7:02 pm
by Bill Spight
Uberdude wrote:
3 is shape intuition and send to kill. Black can make eye in sente in centre with a-f. 7 is the key move, my first idea (actually before that was C4 before I noticed 4 sente) was hane A3 but that's a mistake as it allows a5 sente to make the second eye
Click Here To Show Diagram Code
[go]$$Wc
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . O X X . . X . . . . O . O . . . . |
$$ | . . X O O X . . O . O . . O X O O . . |
$$ | . . O O . X . . . O . X X O X X O . . |
$$ | . . . . . . . . X O X . . X X X X O . |
$$ | . . O . . X . X . O O X X O . X O X . |
$$ | . . . . . . . . O O X X . . . X . . . |
$$ | . . . . . O X X O X . X . O O X . . . |
$$ | . . O O . O O X X . X . . . X . X . . |
$$ | . . O X O . . O X X X . O O X X . O . |
$$ | . . O X O X . O . O . X . X O X O . . |
$$ | . . O X X O b . . O O O X X O O O . O |
$$ | . X O X 1 a . O . X O O O X O . . O X |
$$ | . 6 X 2 f . e O X . X O X X O X O X X |
$$ | . 3 . X X X c O . . . X . X O . O O X |
$$ | 7 . . 4 O X O d . , . . X O O , O X X |
$$ | . X X O 5 O X X X X X . X X X X X X . |
$$ | . O O . . . O O O O . . X O X . . . . |
$$ | . . . . . . . . . . . O O . . . . . . |
$$ +---------------------------------------+[/go]
Aficionados of Sonoda will note that :w7: has a diagonal relationship to :w3:. A-03 does not. :)
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