Life In 19x19
http://www.lifein19x19.com/

A slip of the hand
http://www.lifein19x19.com/viewtopic.php?f=15&t=4274		 Page 1 of 1
Author:  lightvector [ Sun Jul 17, 2011 8:30 pm ]
Post subject:  A slip of the hand
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]
Author:  jts [ Sun Jul 17, 2011 8:58 pm ]
Post subject:  Re: A slip of the hand
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.
Author:  lightvector [ Sun Jul 17, 2011 9:04 pm ]
Post subject:  Re: A slip of the hand
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.
Author:  jts [ Sun Jul 17, 2011 9:19 pm ]
Post subject:  Re: A slip of the hand
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.
Author:  Bill Spight [ Mon Jul 18, 2011 6:35 am ]
Post subject:  Re: A slip of the hand
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.
Author:  HermanHiddema [ Mon Jul 18, 2011 6:44 am ]
Post subject:  Re: A slip of the hand
H3

because
it makes G1 gote


Nice problem! :)
Author:  Bill Spight [ Mon Jul 18, 2011 6:59 am ]
Post subject:  Re: A slip of the hand
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:
Page 1 of 1 All times are UTC - 8 hours [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/