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L&D problem: can white live without ko? http://www.lifein19x19.com/viewtopic.php?f=10&t=17142	Page 1 of 1

Author: rlaalswo [ Mon Dec 16, 2019 8:04 am ]

Post subject: L&D problem: can white live without ko?

White to play first and live. Black has infinte ko threats, so ko is death. Seki and double ko is considered alive.

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ | . . . . O X . . . $$ | . . . . O X . . . $$ | O . . O X X . . . $$ | . . O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ | . . . . O X . . . $$ | . . W . O X . . . $$ | O . . O X X . . . $$ | . . O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Above is the given solution, but I don't think it's right.

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ | . 3 . . O X . . . $$ | . . W . O X . . . $$ | O 2 . O X X . . . $$ | . 1 O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

It seems to result in ko or bent four in corner. Am I not right?

Author: EricBackus [ Mon Dec 16, 2019 10:23 am ]

Post subject: Re: L&D problem: can white live without ko?

rlaalswo wrote:

White to play first and live. Black has infinte ko threats, so ko is death. Seki and double ko is considered alive.

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ | . 3 . . O X . . . $$ | . . W . O X . . . $$ | O 2 . O X X . . . $$ | . 1 O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

It seems to result in ko or bent four in corner. Am I not right?

I think white lives:

Click Here To Show Diagram Code: [go]$$Bc a and b are miai $$ ------------------ $$ | a 3 4 . O X . . . $$ | . 6 W b O X . . . $$ | O 2 5 O X X . . . $$ | . 1 . X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ | . 3 4 . O X . . . $$ | . 5 W . O X . . . $$ | O 2 6 O X X . . . $$ | . 1 O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Author:	jlt [ Mon Dec 16, 2019 10:47 am ]
Post subject:	Re: L&D problem: can white live without ko?
Eric: and if is at b?

Author:	Cassandra [ Mon Dec 16, 2019 11:19 am ]
Post subject:	Re: L&D problem: can white live without ko?
rlaalswo wrote: Click Here To Show Diagram Code `[go]$$Bc $$ ------------------ $$ \| . 3 . . O X . . . $$ \| . . W . O X . . . $$ \| O 2 . O X X . . . $$ \| . 1 O X X . . . . $$ \| O . X X . . . . . $$ \| X X X . . . . . . $$ \| . . . . . . . . . $$ \| . . . . . . . . . $$ \| . . . . . . . . .[/go]` It seems to result in ko or bent four in corner. Am I not right? Click Here To Show Diagram Code `[go]$$Bc $$ ------------------ $$ \| . X . . O X . . . $$ \| . 4 O . O X . . . $$ \| O O . O X X . . . $$ \| . X O X X . . . . $$ \| O . X X . . . . . $$ \| X X X . . . . . . $$ \| . . . . . . . . . $$ \| . . . . . . . . . $$ \| . . . . . . . . .[/go]` The status of Bent-Four-in-the-Corner depends on the number of outside liberties!

Author:	EricBackus [ Mon Dec 16, 2019 4:24 pm ]
Post subject:	Re: L&D problem: can white live without ko?
jlt wrote: Eric: and if is at b? Uh...ok, nevermind.

Author: rlaalswo [ Mon Dec 16, 2019 5:30 pm ]

Post subject: Re: L&D problem: can white live without ko?

Cassandra wrote:

The status of Bent-Four-in-the-Corner depends on the number of outside liberties!

Click Here To Show Diagram Code: [go]$$Wc $$ ------------------ $$ | 3 X 2 . O X . . . $$ | 4 1 O . O X . . . $$ | O O . O X X . . . $$ | . X O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Click Here To Show Diagram Code: [go]$$Wc $$ ------------------ $$ | 6 X X 7 O X . . . $$ | X O O 5 O X . . . $$ | O O . O X X . . . $$ | . X O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ | 2 1 4 O O X . . . $$ | 3 O O O O X . . . $$ | O O . O X X . . . $$ | . X O X X . . . . $$ | O . X X . . . . . $$ | X X X . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . .[/go]

Got it! Thanks!

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