Life In 19x19 :: Classical problem

Click Here To Show Diagram Code

[go]$$B I think ko is best.
$$ -----------------------
$$ . . . . . . 3 2 . O . .
$$ . . . . . O . 1 4 O X .
$$ . X . X X X O O O X X .
$$ . . . . . . X . X . . .
$$ . . . . . . . X . . . .
$$ . . . . . . . . . . . .[/go]

Click Here To Show Diagram Code

[go]$$B If W gets the comb formation he lives, so we need a placement.
$$ -----------------------
$$ . . . . . 2 . . . O . .
$$ . . . . 1 O . . . O X .
$$ . X . X X X O O O X X .
$$ . . . . . . X . X . . .
$$ . . . . . . . X . . . .
$$ . . . . . . . . . . . .[/go]

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[go]$$B This looks tempting, but the liberty at a is inconvenient.
$$ -----------------------
$$ . . . . . . 2 1 . O . .
$$ . . . . 4 O . 3 . O X .
$$ . X . X X X O O O X X .
$$ . . . . . . X a X . . .
$$ . . . . . . . X . . . .
$$ . . . . . . . . . . . .[/go]

Click Here To Show Diagram Code

[go]$$B And the other placement seems to force a ko.
$$ -----------------------
$$ . . . . . . 3 2 . O . .
$$ . . . . . O . 1 4 O X .
$$ . X . X X X O O O X X .
$$ . . . . . . X . X . . .
$$ . . . . . . . X . . . .
$$ . . . . . . . . . . . .[/go]

Click Here To Show Diagram Code

[go]$$B Playing something like  still ends up in ko.
$$ -----------------------
$$ . . . . . . 1 2 . O . .
$$ . . . . . O . 3 4 O X .
$$ . X . X X X O O O X X .
$$ . . . . . . X . X . . .
$$ . . . . . . . X . . . .
$$ . . . . . . . . . . . .[/go]

Author:	unkx80 [ Sun Feb 20, 2011 1:29 am ]
Post subject:	Classical problem
For those interested, here is a classical problem. For those who have not seen it before, it may be harder than its appearance. Click Here To Show Diagram Code `[go]$$B Black to play $$ ----------------------- $$ . . . . . . . . . O . . $$ . . . . . O . . . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]`

Author:	tj86430 [ Sun Feb 20, 2011 1:55 am ]
Post subject:	Re: Classical problem
Naturally my first instinct is: Click Here To Show Diagram Code `[go]$$B Black to play $$ ----------------------- $$ . . . . . . . . . O . . $$ . . . . . O . B . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` and I can't see how white would survive, but since this is supposed to be hard I guess it's wrong.

Author:	daniel_the_smith [ Sun Feb 20, 2011 3:15 am ]
Post subject:	Re: Classical problem
@tj: Click Here To Show Diagram Code `[go]$$W Black to play $$ ----------------------- $$ . . . . . . . 1 . O . . $$ . . . . . O 3 B 2 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$W Black to play $$ ----------------------- $$ . . . . . . . 1 . O . . $$ . . . . . O 2 B 3 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` I was about to post a solution but mine was wrong too... >.<

Author:	Jordus [ Sun Feb 20, 2011 3:25 am ]
Post subject:	Re: Classical problem
@Daniel Smith i think defeats your ... Click Here To Show Diagram Code `[go]$$W Black to play $$ ----------------------- $$ . . . . . 5 2 1 3 O . . $$ . . . . 6 O 4 B . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` only 1 eye if white captures blacks 3 stones because black will play @ 4. Click Here To Show Diagram Code `[go]$$W @ 1 @1 $$ ----------------------- $$ . . . . . 7 2 1 4 O . . $$ . . . . . O 3 B 5 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]`

Author:	Sverre [ Sun Feb 20, 2011 3:26 am ]
Post subject:	Re: Classical problem
unkx80 wrote: For those interested, here is a classical problem. For those who have not seen it before, it may be harder than its appearance. Click Here To Show Diagram Code `[go]$$B I think ko is best. $$ ----------------------- $$ . . . . . . 3 2 . O . . $$ . . . . . O . 1 4 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B If W gets the comb formation he lives, so we need a placement. $$ ----------------------- $$ . . . . . 2 . . . O . . $$ . . . . 1 O . . . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B This looks tempting, but the liberty at a is inconvenient. $$ ----------------------- $$ . . . . . . 2 1 . O . . $$ . . . . 4 O . 3 . O X . $$ . X . X X X O O O X X . $$ . . . . . . X a X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B And the other placement seems to force a ko. $$ ----------------------- $$ . . . . . . 3 2 . O . . $$ . . . . . O . 1 4 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B Playing something like still ends up in ko. $$ ----------------------- $$ . . . . . . 1 2 . O . . $$ . . . . . O . 3 4 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` EDIT: Forgot this variation, if I missed something it's probably somehow related to this . Click Here To Show Diagram Code `[go]$$B The Black attachment is tricky, is this right? $$ ----------------------- $$ . . . . 6 1 5 3 . O 7 . $$ . . . . 2 O 8 4 . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]`

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Classical problem http://prod.lifein19x19.com/viewtopic.php?f=15&t=3258	Page 1 of 1

Author:	tj86430 [ Sun Feb 20, 2011 3:35 am ]
Post subject:	Re: Classical problem
Jordus wrote: @Daniel Smith i think defeats your ... Click Here To Show Diagram Code `[go]$$W Black to play $$ ----------------------- $$ . . . . . 5 2 1 3 O . . $$ . . . . 6 O 4 B . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` only 1 eye if white captures blacks 3 stones because black will play @ 4. Click Here To Show Diagram Code `[go]$$W @ 1 @1 $$ ----------------------- $$ . . . . . 7 2 1 4 O . . $$ . . . . . O 3 B 5 O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]` This is what I had in mind

Author:	explo [ Sun Feb 20, 2011 4:59 am ]
Post subject:	Re: Classical problem
@ Jordus, Daniel and tj86430 3 should be at 5 in the second diagram, and white gets a ko. Black can do better than that. Click Here To Show Diagram Code `[go]$$B Black to play $$ ----------------------- $$ . . . 8 5 . 2 1 . O . . $$ . . 7 6 4 O 9 3 . O X . $$ . X . X X X O O O X X . $$ . . . . . . X . X . . . $$ . . . . . . . X . . . . $$ . . . . . . . . . . . .[/go]`

Author:	unkx80 [ Sun Feb 20, 2011 2:00 pm ]
Post subject:	Re: Classical problem
Yes, explo got it. Solution is unconditional death by bulky five.

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