Life & Death from a game

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judicata
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Life & Death from a game

Post by judicata »

Here is a life and death problem from a recent game, white to kill (on the right side, obviously):

Click Here To Show Diagram Code
[go]$$c White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . X O O . . .|
$$ |. X X X O . O . O X . X O X X O O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]
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Re: Life & Death from a game

Post by Koosh »

Click Here To Show Diagram Code
[go]$$c White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . X O O . . .|
$$ |. X X X O . O . O X W X O X X O O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]


:mrgreen:
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daniel_the_smith
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Re: Life & Death from a game

Post by daniel_the_smith »

Koosh got it, of course.

But I wanted this to be the solution:

Click Here To Show Diagram Code
[go]$$c White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . X O O . . .|
$$ |. X X X O . O . O X . X O X X O O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . W X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]


So I was about to post this modified position:

Click Here To Show Diagram Code
[go]$$c White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . X O O . . .|
$$ |. X X X O . O O . X . X O X X O O . .|
$$ |X . X . X O . . O O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]


Unfortunately, while Koosh's answer doesn't kill this one, neither does mine, because black has a surprising (to me) response. :(
That which can be destroyed by the truth should be.
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jts
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Re: Life & Death from a game

Post by jts »

@daniel
It looks to me like L19 and L17 both work... is there a problem with one of them?
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Re: Life & Death from a game

Post by tchan001 »

Click Here To Show Diagram Code
[go]$$c White to kill
$$ ---------------------------------------
$$ |. . . O . . . . W X . O . X O O . . .|
$$ |. X X X O . O . O X . X O X X O O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]
http://tchan001.wordpress.com
A blog on Asian go books, go sightings, and interesting tidbits
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Re: Life & Death from a game

Post by daniel_the_smith »

@jts

I was thinking of L19, but yeah, both work. Time for bed!
That which can be destroyed by the truth should be.
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Re: Life & Death from a game

Post by Koosh »

GrawWw, daniel's answer to the original problem is better than mine :blackeye:
Ko is the best solution.
With Ko, I can keep eating and drinking until I am full.

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Re: Life & Death from a game

Post by Solomon »

A small tweak:
Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . . X O O . .|
$$ |. X X X O . O . O X . X O . . X O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]
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judicata
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Re: Life & Death from a game

Post by judicata »

Koosh was cheating, as he watched the game in which this arose. I played his proposed solution--but I didn't realize there was more than one answer...
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Re: Life & Death from a game

Post by Shaddy »

Araban wrote:A small tweak:
Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . . X O O . .|
$$ |. X X X O . O . O X . X O . . X O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]


Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X 6 O 2 5 X O O . .|
$$ |. X X X O . O . O X 3 X O 1 7 X O . .|
$$ |X . X . X O . . . O 4 X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]
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Re: Life & Death from a game

Post by lightvector »

Shaddy wrote:
Araban wrote:A small tweak:
Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O . . X O O . .|
$$ |. X X X O . O . O X . X O . . X O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]


Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X 6 O 2 5 X O O . .|
$$ |. X X X O . O . O X 3 X O 1 7 X O . .|
$$ |X . X . X O . . . O 4 X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]


How does white respond to this?

Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X 2 O . . X O O . .|
$$ |. X X X O . O . O X . X O 1 . X O . .|
$$ |X . X . X O . . . O . X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]
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Re: Life & Death from a game

Post by EricBackus »

Back to the original problem for a moment...

My first thought was to reduce the eyespace by playing at L17.

Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O 3 X O O . . .|
$$ |. X X X O . O . O X 2 X O X X O O . .|
$$ |X . X . X O . . . O 1 X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]

Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X 2 O . X O O . . .|
$$ |. X X X O . O . O X 3 X O X X O O . .|
$$ |X . X . X O . . . O 1 X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]

Click Here To Show Diagram Code
[go]$$Wc White to kill
$$ ---------------------------------------
$$ |. . . O . . . . . X . O 2 X O O . . .|
$$ |. X X X O . O . O X 3 X O X X O O . .|
$$ |X . X . X O . . . O 1 X X X X X O . .|
$$ |. X . , X X O . . O O X X O O X O . .|
$$ |. O X . X X . . . . . X O . O O X O .|
$$ |. . O X . X . . . O . O . O . . X . .|
$$ |. X . O X O O . . . . . . . . . X . .|[/go]

If reducing the eyespace works, why look for more complicated scenarios?
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judicata
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Re: Life & Death from a game

Post by judicata »

EricBackus wrote:If reducing the eyespace works, why look for more complicated scenarios?


Because more complicated=cooler. :batman:
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Re: Life & Death from a game

Post by EricBackus »

judicata wrote:
EricBackus wrote:If reducing the eyespace works, why look for more complicated scenarios?

Because more complicated=cooler. :batman:

OK, true. :cool:
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Re: Life & Death from a game

Post by Joaz Banbeck »

Less complicated = more elegant.
Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207
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