Life In 19x19 :: White to kill

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White to kill http://www.lifein19x19.com/viewtopic.php?f=15&t=17201	Page 1 of 1

Author:	Gomoto [ Tue Jan 14, 2020 4:24 pm ]
Post subject:	White to kill
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]

Author:	Uberdude [ Tue Jan 14, 2020 5:56 pm ]
Post subject:	Re: White to kill
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]

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

Author:	Bill Spight [ Tue Jan 14, 2020 6:58 pm ]
Post subject:	Re: White to kill
I did not see how Black to play could kill White.

Author:	Bill Spight [ Tue Jan 14, 2020 7:02 pm ]
Post subject:	Re: White to kill
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 has a diagonal relationship to . A-03 does not.

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