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Nice Tesuji

https://lifein19x19.com/viewtopic.php?t=17193

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Nice Tesuji

Posted: Sun Jan 12, 2020 5:58 am
by 00Noles
As I always find real board problems quite interesting and helpful, I wanted to share with you a position, that occurred in one of my games.


The black group on the right side of the board is in danger, but there is a way to safe those stones!
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . O . . . X O O . O O X . . |
$$ | . . . . . O X X . X . X O O . O X O . |
$$ | . . . O . O O X . . X X X . O X O O X |
$$ | . . O , . O X X . X O . . O O X X X . |
$$ | . O O X . X O . . X O O . O X X . X . |
$$ | . O X X . X . . . . X O . . X O X O O |
$$ | . X . . . . . . . . X O X X X O . O . |
$$ | . X . . . . . . . . X X O O X O O . . |
$$ | . O X X . . . . . . . . . O X X O . . |
$$ | . O O X . . . . . , X X X O . X O . . |
$$ | . O X . X . . X X X O X O O X X O . . |
$$ | . . O X . . . . O O O O X O . X . O . |
$$ | . . O . . X X X . . . . X O O . X . O |
$$ | . O O O O O O . . X . X . X O O X X . |
$$ | O . O X X . . O . . X . . X O X . . X |
$$ | . O X , X . X O X O O X X X O X X X . |
$$ | . X X . . X O O . X X O O X O O X O X |
$$ | . . X X . X O . O O X O O O . O O O O |
$$ | . . . X . X . . . . X X O . O . . . . |
$$ +---------------------------------------+[/go]

Re: Nice Tesuji

Posted: Sun Jan 12, 2020 6:15 am
by jlt
Click Here To Show Diagram Code
[go]$$ :w6: at :b1:
$$ +---------------------------------------+
$$ | . . . . . . O . . . X O O 9 O O X . . |
$$ | . . . . . O X X . X . X O O 8 O X O . |
$$ | . . . O . O O X . . X X X 7 O X O O X |
$$ | . . O , . O X X . X O 3 2 O O X X X . |
$$ | . O O X . X O . . X O O 1 O X X . X . |
$$ | . O X X . X . . . . X O 4 5 X O X O O |
$$ | . X . . . . . . . . X O X X X O . O . |
$$ | . X . . . . . . . . X X O O X O O . . |[/go]
Click Here To Show Diagram Code
[go]$$ :w6: at :b1:
$$ +---------------------------------------+
$$ | . . . . . . O . . . X O O 9 O O X . . |
$$ | . . . . . O X X . X . X O O 8 O X O . |
$$ | . . . O . O O X . . X X X 7 O X O O X |
$$ | . . O , . O X X . X O 5 4 O O X X X . |
$$ | . O O X . X O . . X O O 1 O X X . X . |
$$ | . O X X . X . . . . X O 2 3 X O X O O |
$$ | . X . . . . . . . . X O X X X O . O . |
$$ | . X . . . . . . . . X X O O X O O . . |[/go]

Re: Nice Tesuji

Posted: Sun Jan 12, 2020 7:39 am
by bogiesan
Thanks for the post.

I think white plays at 7 as soon as black plays 1.

Re: Nice Tesuji

Posted: Sun Jan 12, 2020 8:28 am
by jlt
I think White resigns as soon as Black plays :b1: because Black is leading by 40-50 points. But otherwise I would capture at S1 (which is sente), so that T2 is not sente anymore.

Re: Nice Tesuji

Posted: Sun Jan 12, 2020 2:47 pm
by Gomoto
Thanks for sharing

Re: Nice Tesuji

Posted: Mon Jan 13, 2020 2:49 pm
by Uberdude
Nice example of why you shouldn't play endgame sente too early (or as timesuji)!
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . O . . . X O O . O O . 2 . |
$$ | . . . . . O X X . X . X O O . O . O 1 |
$$ | . . . O . O O X . . X X X . O X O O X |
$$ | . . O , . O X X . X O . . O O X X X . |
$$ | . O O X . X O . . X O O . O X X . X . |
$$ | . O X X . X . . . . X O . . X O X O O |
$$ | . X . . . . . . . . X O X X X O . O . |
$$ | . X . . . . . . . . X X O O X O O . . |
$$ | . O X X . . . . . . . . . O X X O . . |
$$ | . O O X . . . . . , X X X O . X O . . |
$$ | . O X . X . . X X X O X O O X X O . . |
$$ | . . O X . . . . O O O O X O . X . O . |
$$ | . . O . . X X X . . . . X O O . X . O |
$$ | . O O O O O O . . X . X . X O O X X . |
$$ | O . O X X . . O . . X . . X O X . . X |
$$ | . O X , X . X O X O O X X X O X X X . |
$$ | . X X . . X O O . X X O O X O O X O X |
$$ | . . X X . X O . O O X O O O . O O O O |
$$ | . . . X . X . . . . X X O . O . . . . |
$$ +---------------------------------------+[/go]
P.S I'm guessing earlier there was this exchange, white 2 would have been better at a.
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . O . . . X O O . O 2 X a . |
$$ | . . . . . O X X . X . X O O . O X O . |
$$ | . . . O . O O X . . X X X . O X O O 1 |
$$ | . . O , . O X X . X O . . O O X X X . |
$$ | . O O X . X O . . X O O . O X X . X . |
$$ | . O X X . X . . . . X O . . X O X O O |
$$ | . X . . . . . . . . X O X X X O . O . |
$$ | . X . . . . . . . . X X O O X O O . . |
$$ | . O X X . . . . . . . . . O X X O . . |
$$ | . O O X . . . . . , X X X O . X O . . |
$$ | . O X . X . . X X X O X O O X X O . . |
$$ | . . O X . . . . O O O O X O . X . O . |
$$ | . . O . . X X X . . . . X O O . X . O |
$$ | . O O O O O O . . X . X . X O O X X . |
$$ | O . O X X . . O . . X . . X O X . . X |
$$ | . O X , X . X O X O O X X X O X X X . |
$$ | . X X . . X O O . X X O O X O O X O X |
$$ | . . X X . X O . O O X O O O . O O O O |
$$ | . . . X . X . . . . X X O . O . . . . |
$$ +---------------------------------------+[/go]

Re: Nice Tesuji

Posted: Wed Jan 15, 2020 12:17 am
by 00Noles
Well done! :clap:
Thanks for pointing out the subtleties of this position @uberdude ! You're right about the exchange in the top right ;-)

Re: Nice Tesuji

Posted: Wed Jan 15, 2020 8:57 am
by Kirby
Uberdude wrote: P.S I'm guessing earlier there was this exchange, white 2 would have been better at a.
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . O . . . X O O . O 2 X a . |
$$ | . . . . . O X X . X . X O O . O X O b |
$$ | . . . O . O O X . . X X X . O X O O 1 |
$$ | . . O , . O X X . X O . . O O X X X . |
$$ | . O O X . X O . . X O O . O X X . X . |
$$ | . O X X . X . . . . X O . . X O X O O |
$$ | . X . . . . . . . . X O X X X O . O . |
$$ | . X . . . . . . . . X X O O X O O . . |
$$ | . O X X . . . . . . . . . O X X O . . |
$$ | . O O X . . . . . , X X X O . X O . . |
$$ | . O X . X . . X X X O X O O X X O . . |
$$ | . . O X . . . . O O O O X O . X . O . |
$$ | . . O . . X X X . . . . X O O . X . O |
$$ | . O O O O O O . . X . X . X O O X X . |
$$ | O . O X X . . O . . X . . X O X . . X |
$$ | . O X , X . X O X O O X X X O X X X . |
$$ | . X X . . X O O . X X O O X O O X O X |
$$ | . . X X . X O . O O X O O O . O O O O |
$$ | . . . X . X . . . . X X O . O . . . . |
$$ +---------------------------------------+[/go]
(I added “b”)

Why would :w2: be better at “a”? White can’t get “b” with white “a” unless white captures - but that doesn’t seem worse than with :w2:.. and with :w2:, white could sacrifice stones in ko if necessary.

Re: Nice Tesuji

Posted: Wed Jan 15, 2020 9:23 am
by Uberdude
Kirby wrote: Why would :w2: be better at “a”?
Because :w2: filled in one of white's own liberties which made the shortage of liberties tesuji of the game work for black.

Re: Nice Tesuji

Posted: Wed Jan 15, 2020 9:33 am
by Kirby
Uberdude wrote:
Kirby wrote: Why would :w2: be better at “a”?
Because :w2: filled in one of white's own liberties which made the shortage of liberties tesuji of the game work for black.
Haha, yeah. I looked at this thread earlier but forgot the nuance here. I was too zoomed in on the local situation.
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