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Tsumego from your games
http://www.lifein19x19.com/viewtopic.php?f=15&t=14003		 Page 1 of 1
Author:  jussius [ Fri Feb 03, 2017 6:11 pm ]
Post subject:  Tsumego from your games
How about a thread where we post tsumego from our own games for others to solve? Of course it doesn't have to be exactly same as in your game. Feel free to modify the positions if it makes them more suitable for tsumego, or you can post situations that could have happened but in the end never did.

I'll start with a rather tricky situation from my game. In the actual game I was trying to read what happens after black plays 1. I thought black could probably get a ko without steps so I ended up protecting before black had the change to play 1. But after the game I analyzed the situation in more detail and it turns out maybe white isn't in any real danger here. Can you find a way for white to win the semeai?

Click Here To Show Diagram Code
[go]$$c White to win the semeai
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . . . X . . . |
$$ . . . . X . . . . . . . . . |
$$ . . . . . . . O O . . . . . |
$$ . . O . . . X X O X X X . . |
$$ . . . X X X X O O X O X . . |
$$ . O X X O O X O X O O O X . |
$$ . O O O . O O X X 1 . . O . |
$$ . . X . O . X . . . . . . . |
$$ . --------------------------[/go]


P.S.
I'm kinda new here. Is this the right sub-forum for this? Or should it be in General Go Chat or Amateurs
Author:  EdLee [ Fri Feb 03, 2017 6:35 pm ]
Post subject: 
Hi jussius,

Thanks for starting this thread.
Seems a good place ( there are grey areas :) )
Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . |
$$ . . . . . . . . X . . |
$$ . . . O O O X X X . . |
$$ . O . . O X O O O X . |
$$ . . O O X X 1 . . O . |
$$ . O . X . . . . . . . |
$$-----------------------[/go]

One way W can kill himself:
Click Here To Show Diagram Code
[go]$$ :b7: @ :bc: , :w8: @ :b3: , :w10: @ :bc:
$$ . . . . . . . . . . . |
$$ . . . . . . . . X . . |
$$ . . . O O O X X X 2 6 |
$$ . O . . O X O O O B 3 |
$$ . . O O X X 1 9 5 O 4 |
$$ . O . X . . . . . . . |
$$ ----------------------[/go]
Click Here To Show Diagram Code
[go]$$Bm11
$$ . . . . . . . . . . . |
$$ . . . . . . . . X 1 . |
$$ . . . O O O X X X O O |
$$ . O . . O X O O O O O |
$$ . . O O X X X X X O O |
$$ . O . X . . . . . . . |
$$ ----------------------[/go]
Hmm, how about:
Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . |
$$ . . . . . . . . X . . |
$$ . . . O O O X X X . . |
$$ . O . . O X O O O X . |
$$ . . O O X X 1 . . O . |
$$ . O . X . . . 2 . . . |
$$ ----------------------[/go]
If :b3: hane:
Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . |
$$ . . . . . . . . X . . |
$$ . . . O O O X X X . . |
$$ . O . . O X O O O X . |
$$ . . O O X X 1 4 . O 3 |
$$ . O . X . . 6 2 . 5 . |
$$ ----------------------[/go]
Author:  Fedya [ Fri Feb 03, 2017 7:19 pm ]
Post subject:  Re: Tsumego from your games
My first thought was:
Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . . . . X . . |
$$ . . . . . . O O O X X X b . |
$$ . . . . O . . O X O O O X . |
$$ . O O O . O O X X 1 a . O . |
$$ . . X . O . X . . . . 2 . . |
$$ -----------------------------[/go]


Threatening both a and b. But then I realized Black should play:

Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . . . . X . . |
$$ . . . . . . O O O X X X . . |
$$ . . . . O . . O X O O O X . |
$$ . O O O . O O X X 1 . . O . |
$$ . . X . O . X . . . 3 2 . . |
$$ -----------------------------[/go]


Is there something better than:

Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . . . . X . . |
$$ . . . . . . O O O X X X 4 . |
$$ . . . . O . . O X O O O X 6 |
$$ . O O O . O O X X 1 7 5 O . |
$$ . . X . O . X . . . 3 2 . . |
$$ -----------------------------[/go]


:w8: at S3

Click Here To Show Diagram Code
[go]$$
$$ . . . . . . . . . . . 4 3 . |
$$ . . . . . . . . . . . X 2 . |
$$ . . . . . . O O O X X X O . |
$$ . . . . O . . O X O O O O O |
$$ . O O O . O O X X X X X O . |
$$ . . X . O . X . . . X O 1 . |
$$ -----------------------------[/go]


Now it's going to depend on the rest of the board.


I'm likely missing something, of course. Your position seems a bit different from the actual game position.
Author:  EdLee [ Fri Feb 03, 2017 7:32 pm ]
Post subject: 
Hi Fedya,
Thanks for the vars. If the outside libs are a problem,
then just add enough stones to maintain the "essence" of the original shape. :)

In this var:
Quote:
Click Here To Show Diagram Code
[go]$$B
$$ . . . . . . . . . . . |
$$ . . . . . . . . 4 3 . |
$$ . . . . . . . . X 2 . |
$$ . . . O O O X X X O . |
$$ . O . . O X O O O O O |
$$ . . O O X X X X X O . |
$$ . O . X . . . X O 1 . |
$$ -----------------------[/go]
Instead, B probably needs to turn at :b1: :
Click Here To Show Diagram Code
[go]$$B :w8: @ :w4: (1-step?) Ko
$$ . . . . . . . . . . . |
$$ . . . . . . . . X 1 3 |
$$ . . . O O O X X X O 7 |
$$ . O . . O X O O O O O |
$$ . . O O X X X X X O . |
$$ . O 6 X 4 5 . X O 2 . |
$$ -----------------------[/go]
Author:  jussius [ Fri Feb 03, 2017 8:05 pm ]
Post subject:  Re: Tsumego from your games
Hi EdLee! Nice job, jumping down should be the correct move for white, and your variation is one way black could play, to get corner in sente. But if black is really serious about killing white, he can still force a (somewhat heavy) two step ko after white's jump.

In your "white kills himself" variation, black 3 is actually a mistake after which white can live unconditionally.
Author:  Fedya [ Sat Feb 04, 2017 1:23 pm ]
Post subject:  Re: Tsumego from your games
Ed, I was thinking this:

Click Here To Show Diagram Code
[go]$$B White does win the capturing race, right?
$$ . . . . . . . . . . . |
$$ . . . . . . . . X 1 3 |
$$ . . . O O O X X X O . |
$$ . O . . O X O O O O O |
$$ . . O O X X X X X O . |
$$ . O . X . 4 . X O 2 . |
$$ -----------------------[/go]
Author:  EdLee [ Sat Feb 04, 2017 1:54 pm ]
Post subject: 
Hi Fedya,
Quote:
Click Here To Show Diagram Code
[go]$$B
$$ . . . . . . . . . . . |
$$ . . . . . . . . X 1 3 |
$$ . . . O O O X X X O . |
$$ . O . . O X O O O O O |
$$ . . O O X X X X X O . |
$$ . O . X . 4 . X O 2 . |
$$ -----------------------[/go]
Yes, W wins, thanks. :)
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