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Offline lightvector
 Post subject: A slip of the hand
Post #1 Posted: Sun Jul 17, 2011 8:30 pm 
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A slightly unusual problem I attempted to compose. I hope the solution works and I didn't screw anything up.

It's white's turn, and he is well on his way to victory. However, as he reaches to make his move, he accidentally drops the stone and it lands on the wrong spot! As a result, despite best efforts thereafter, white loses the game. How did this happen? For the purpose of scoring, assume japanese rules with 6.5 komi, and that no captures have happened yet.

Click Here To Show Diagram Code
[go]$$c White to play and lose, 6.5 komi
$$ ---------------------
$$ | . . . X . X O . . . |
$$ | . O O X X X O . . O |
$$ | . O X . X O X O O O |
$$ | . O X X O O X X X X |
$$ | . O . O O . O O X . |
$$ | . . O . O O X . X . |
$$ | . . O X . . X X . . |
$$ | . . O O X X X . X . |
$$ | . . . O O O X . . . |
$$ | . . . . . . . . . . |
$$ ---------------------[/go]


Last edited by lightvector on Sun Jul 17, 2011 9:02 pm, edited 1 time in total.
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Offline jts
 Post subject: Re: A slip of the hand
Post #2 Posted: Sun Jul 17, 2011 8:58 pm 
Oza
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I think any move inside his own or black's territory loses the game. For example: J10, H9, C10, and C6 seem to be the only winning moves for white. H5 would be a particularly spectacular way to lose, and if I'm counting wrong that must be the right answer.

For example: A5, H9, C10, H10, G1, H1, F1, H2, E4, and the score is W 22, B26.
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Offline lightvector
 Post subject: Re: A slip of the hand
Post #3 Posted: Sun Jul 17, 2011 9:04 pm 
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jts wrote:
I think any move inside his own or black's territory loses the game. For example: J10, H9, C10, and C6 seem to be the only winning moves for white. H5 would be a particularly spectacular way to lose, and if I'm counting wrong that must be the right answer.

For example: A5, H9, C10, H10, G1, H1, F1, H2, E4, and the score is W 22, B26.


Did you take this into account?

lightvector wrote:
For the purpose of scoring, assume japanese rules with 6.5 komi, and that no captures have happened yet.
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Offline jts
 Post subject: Re: A slip of the hand
Post #4 Posted: Sun Jul 17, 2011 9:19 pm 
Oza
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lightvector wrote:
jts wrote:
I think any move inside his own or black's territory loses the game. For example: J10, H9, C10, and C6 seem to be the only winning moves for white. H5 would be a particularly spectacular way to lose, and if I'm counting wrong that must be the right answer.

For example: A5, H9, C10, H10, G1, H1, F1, H2, E4, and the score is W 22, B26.


Did you take this into account?

lightvector wrote:
For the purpose of scoring, assume japanese rules with 6.5 komi, and that no captures have happened yet.

I'm so dumb :D Ok, with H5 B wins by 0.5... E4 and F6 are miai for the last 3 points B needs.
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Offline Bill Spight
 Post subject: Re: A slip of the hand
Post #5 Posted: Mon Jul 18, 2011 6:35 am 
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Click Here To Show Diagram Code
[go]$$Wc White to play and lose, 6.5 komi
$$ ---------------------
$$ | . . 5 X . X O 6 . . |
$$ | . O O X X X O 2 . O |
$$ | . O X 4 X O X O O O |
$$ | . O X X O O X X X X |
$$ | . O 3 O O . O O X . |
$$ | . . O . O O X 1 X . |
$$ | . . O X . . X X . . |
$$ | . . O O X X X . X . |
$$ | . . . O O O X 0 . . |
$$ | . . . . . 9 7 8 . . |
$$ ---------------------[/go]


Click Here To Show Diagram Code
[go]$$Wcm11 2 W captives
$$ ---------------------
$$ | . . O X . X . X . . |
$$ | . O O X X X . X . O |
$$ | . O X X X O X O O O |
$$ | . O X X O O X X X X |
$$ | . O O O O 1 O O X . |
$$ | . . O . O O X O X . |
$$ | . . O X 2 . X X . . |
$$ | . . O O X X X . X . |
$$ | . . . O O O X X . . |
$$ | . . . . . O O X . . |
$$ ---------------------[/go]


White wins by 0.5.

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The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.
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Offline HermanHiddema
 Post subject: Re: A slip of the hand
Post #6 Posted: Mon Jul 18, 2011 6:44 am 
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H3

because
it makes G1 gote


Nice problem! :)

This post by HermanHiddema was liked by 3 people: Bill Spight, ez4u, topazg
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Offline Bill Spight
 Post subject: Re: A slip of the hand
Post #7 Posted: Mon Jul 18, 2011 6:59 am 
Honinbo

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Click Here To Show Diagram Code
[go]$$Wc White to play and lose, 6.5 komi
$$ ---------------------
$$ | . . 5 X . X O 6 . . |
$$ | . O O X X X O 2 . O |
$$ | . O X 4 X O X O O O |
$$ | . O X X O O X X X X |
$$ | . O 3 O O . O O X . |
$$ | . . O . O O X . X . |
$$ | . . O X 7 . X X . . |
$$ | . . O O X X X 1 X . |
$$ | . . . O O O X . . . |
$$ | . . . . 9 8 0 . . . |
$$ ---------------------[/go]


Black wins by 0.5. :) :salute:

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.
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