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Go Problem!

https://lifein19x19.com/viewtopic.php?t=9557

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Go Problem!

Posted: Wed Dec 18, 2013 4:12 pm
by Kirby
I thought this go problem was interesting:
Click Here To Show Diagram Code
[go]$$c
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . , X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Re: Go Problem!

Posted: Wed Dec 18, 2013 5:03 pm
by Dusk Eagle
Is it ko?
Click Here To Show Diagram Code
[go]$$c
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | 3 . O . . . . . . . . . . . . . . . . |
$$ | 2 1 4 X . . . . . . . . . . . . . . . |
$$ | 7 6 5 , X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Re: Go Problem!

Posted: Wed Dec 18, 2013 5:14 pm
by moyoaji
Alright. Let's look at this. It seems like :b1: is the vital point, but what can white do?
Click Here To Show Diagram Code
[go]$$c Vital point?
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . 1 . X . . . . . . . . . . . . . . . |
$$ | . . . , X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c White fails - shortage of liberties
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . 1 2 X . . . . . . . . . . . . . . . |
$$ | . 5 3 4 X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c White fails - shortage of liberties
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . 1 2 X . . . . . . . . . . . . . . . |
$$ | . 4 3 5 X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c White fails - connect and die
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . . . . . . |
$$ | . 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 4 X . . . . . . . . . . . . . . . |
$$ | . 6 5 7 X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c White fails - still connect and die
$$ | . 7 . . . . . . . . . . . . . . . . . |
$$ | 6 5 O . O . . . . . . . . . . . . . . |
$$ | 4 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 8 X . . . . . . . . . . . . . . . |
$$ | . 0 9 B X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Is there anything I am missing?

Re: Go Problem!

Posted: Wed Dec 18, 2013 5:22 pm
by DrStraw
Click Here To Show Diagram Code
[go]$$c Black needs to be careful if :w6:
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 6 O . O . . . . . . . . . . . . . . |
$$ | 7 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 4 X . . . . . . . . . . . . . . . |
$$ | . 8 5 . X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c This works.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 6 O . O . . . . . . . . . . . . . . |
$$ | 8 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 4 X . . . . . . . . . . . . . . . |
$$ | . 9 5 7 X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Re: Go Problem!

Posted: Wed Dec 18, 2013 6:06 pm
by Kirby
DrStraw wrote:
Click Here To Show Diagram Code
[go]$$c Black needs to be careful if :w6:
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 6 O . O . . . . . . . . . . . . . . |
$$ | 7 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 4 X . . . . . . . . . . . . . . . |
$$ | . 8 5 . X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c This works.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 6 O . O . . . . . . . . . . . . . . |
$$ | 8 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 4 X . . . . . . . . . . . . . . . |
$$ | . 9 5 7 X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$c This works.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 4 O . O . . . . . . . . . . . . . . |
$$ | . 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 . X . . . . . . . . . . . . . . . |
$$ | . . . . X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Re: Go Problem!

Posted: Wed Dec 18, 2013 6:13 pm
by moyoaji
Kirby wrote:
Click Here To Show Diagram Code
[go]$$c This works.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 4 O . O . . . . . . . . . . . . . . |
$$ | . 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 . X . . . . . . . . . . . . . . . |
$$ | . . . . X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Looks like ko again.
Click Here To Show Diagram Code
[go]$$c Ko, white cannot take at 'a' or it is self-atari.
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 4 O . O . . . . . . . . . . . . . . |
$$ | 5 3 O . . . . . . . . . . . . . . . . |
$$ | 2 1 6 X . . . . . . . . . . . . . . . |
$$ | 9 8 7 a X . . . . , . . . . . , . . . |
$$ | O O O O X . . . . . . . . . . . . . . |
$$ | X X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Re: Go Problem!

Posted: Wed Dec 18, 2013 6:34 pm
by DrStraw
It seems that group think has arrived at the 1p solution - or have we?. Where does the problem come from?

Re: Go Problem!

Posted: Wed Dec 18, 2013 8:27 pm
by Kirby
DrStraw wrote:It seems that group think has arrived at the 1p solution - or have we?. Where does the problem come from?
Yes, the answer is ko. The first reply works, and like moyoaji pointed out, ko can be reached from your starting move, too.

The problem came from a lecture I watched, and I liked the shape, so I posted it here.
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