[go]$$ White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . . . B O . . $$ | . . . . X O . B O . . $$ | . . . . X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
(I say just the marked stones because I'm not positive yet that black can't give them up in some inventive way for life in the corner. If you find something, let me know!)
Re: a Tsumego that cropped up in one of my games
Posted: Mon Mar 07, 2011 9:56 am
by tj86430
I'd start with:
$$ White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . . . X O . . $$ | . . W . X O . X O . . $$ | . . . . X O X X O . . $$ | . . . O O X X O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$ White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . . . X O . . $$ | . . W . X O . X O . . $$ | . . . . X O X X O . . $$ | . . . O O X X O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
Re: a Tsumego that cropped up in one of my games
Posted: Mon Mar 07, 2011 10:01 am
by topazg
$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 1 . B O . . $$ | . . a . X O . B O . . $$ | . . b . X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 1 . B O . . $$ | . . a . X O . B O . . $$ | . . b . X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
That's my first instinct, as Black "a" doesn't now seem to work. Haven't read out black "b" properly yet.
$$W White kills everything $$ - - - - - - - - - - - - $$ | . . . 6 7 1 . B O . . $$ | . . 2 3 X O . B O . . $$ | . . 5 4 X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$W This doesn't seem to work ... yet $$ - - - - - - - - - - - - $$ | . . . . . 1 . B O . . $$ | . . 3 . X O . B O . . $$ | . 5 2 4 X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
$$B Got 'em, but can't be good! $$ - - - - - - - - - - - - $$ | . . . . 6 O . B O . . $$ | . . O . X O . B O . . $$ | . O X X X O B B O . . $$ | . 2 1 O O B B O O . . $$ | . 5 O 3 4 . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$B Got 'em, but can't be good! $$ - - - - - - - - - - - - $$ | . . . . 6 O . B O . . $$ | . . O . X O . B O . . $$ | . O X X X O B B O . . $$ | . 2 1 O O B B O O . . $$ | . 5 O 3 4 . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
@TJ:
$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 2 4 B O . . $$ | . . 1 . X 5 . B O . . $$ | . . 6 . X . B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 2 4 B O . . $$ | . . 1 . X 5 . B O . . $$ | . . 6 . X . B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
Does this not work for Black?
Re: a Tsumego that cropped up in one of my games
Posted: Mon Mar 07, 2011 12:57 pm
by shapenaji
topazg wrote:
$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 1 . B O . . $$ | . . a . X O . B O . . $$ | . . b . X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 1 . B O . . $$ | . . a . X O . B O . . $$ | . . b . X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
That's my first instinct, as Black "a" doesn't now seem to work. Haven't read out black "b" properly yet.
$$W White kills everything $$ - - - - - - - - - - - - $$ | . . . 6 7 1 . B O . . $$ | . . 2 3 X O . B O . . $$ | . . 5 4 X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$W This doesn't seem to work ... yet $$ - - - - - - - - - - - - $$ | . . . . . 1 . B O . . $$ | . . 3 . X O . B O . . $$ | . 5 2 4 X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
$$B Got 'em, but can't be good! $$ - - - - - - - - - - - - $$ | . . . . 6 O . B O . . $$ | . . O . X O . B O . . $$ | . O X X X O B B O . . $$ | . 2 1 O O B B O O . . $$ | . 5 O 3 4 . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$B Got 'em, but can't be good! $$ - - - - - - - - - - - - $$ | . . . . 6 O . B O . . $$ | . . O . X O . B O . . $$ | . O X X X O B B O . . $$ | . 2 1 O O B B O O . . $$ | . 5 O 3 4 . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
@TJ:
$$W White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . . . . . 2 4 B O . . $$ | . . 1 . X 5 . B O . . $$ | . . 6 . X . B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .
[go]$$ White to move and kill the marked stones $$ - - - - - - - - - - - - $$ | . 9 8 . . 2 . B O . . $$ | . 7 6 5 1 O . B O . . $$ | . a 3 4 X O B B O . . $$ | . . . O O B B O O . . $$ | . . O . . . . O . . . $$ | . O X . . O . . . . . $$ | . . . . . . . . . . . $$ | . . O X . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . . .[/go]
and then "a" and the throw in kills, black can't take both an eye in the corner AND prevent the pseudo-seki on the right
Re: a Tsumego that cropped up in one of my games
Posted: Sun Mar 20, 2011 5:56 pm
by cyclops
B3@5 in the diagram above is refuted by a nice tesuji:
$$Bc a->b->c->6->10->d->6->e $$ +--------------------- $$ | c 9 d b 4 O . X O . $$ | 0 6 3 5 X O . X O . $$ | a 7 2 1 X O X X O . $$ | . e 8 O O X X O O , $$ | . . O . . . . O . . $$ | . O X . . O . . . . $$ | . . . . . . . . . . $$ | . . O X . . . . . . $$ | . . . . . . . . . . $$ | . . X X . . . . . , $$ | . . . . . . . . . .
[go]$$Bc a->b->c->6->10->d->6->e $$ +--------------------- $$ | c 9 d b 4 O . X O . $$ | 0 6 3 5 X O . X O . $$ | a 7 2 1 X O X X O . $$ | . e 8 O O X X O O , $$ | . . O . . . . O . . $$ | . O X . . O . . . . $$ | . . . . . . . . . . $$ | . . O X . . . . . . $$ | . . . . . . . . . . $$ | . . X X . . . . . , $$ | . . . . . . . . . .[/go]
