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.
$$c White to play and lose, 6.5 komi $$ --------------------- $$ | . . . X . X O . . . | $$ | . 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 . | $$ | . . . O O O X . . . | $$ | . . . . . . . . . . | $$ ---------------------
[go]$$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]
Re: A slip of the hand
Posted: Sun Jul 17, 2011 8:58 pm
by jts
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.
Re: A slip of the hand
Posted: Sun Jul 17, 2011 9:04 pm
by lightvector
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.
Re: A slip of the hand
Posted: Sun Jul 17, 2011 9:19 pm
by jts
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 Ok, with H5 B wins by 0.5... E4 and F6 are miai for the last 3 points B needs.
Re: A slip of the hand
Posted: Mon Jul 18, 2011 6:35 am
by Bill Spight
$$Wc White to play and lose, 6.5 komi $$ --------------------- $$ | . . 5 X . X O 6 . . | $$ | . 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 . . | $$ ---------------------
[go]$$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]
$$Wcm11 2 W captives $$ --------------------- $$ | . . O X . X . X . . | $$ | . 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 . . | $$ ---------------------
[go]$$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.
Re: A slip of the hand
Posted: Mon Jul 18, 2011 6:44 am
by HermanHiddema
H3
because
it makes G1 gote
Nice problem!
Re: A slip of the hand
Posted: Mon Jul 18, 2011 6:59 am
by Bill Spight
$$Wc White to play and lose, 6.5 komi $$ --------------------- $$ | . . 5 X . X O 6 . . | $$ | . 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 . . . | $$ ---------------------
[go]$$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]
Ok, with H5 B wins by 0.5... E4 and F6 are miai for the last 3 points B needs.
