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Endgame tesuji from a game
http://www.lifein19x19.com/viewtopic.php?f=15&t=3856
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Author:  Redundant [ Sat May 14, 2011 7:46 pm ]
Post subject:  Endgame tesuji from a game

I just went to the go club in my hometown for the first time, and noticed an interesting* tesuji during a 2 stone game. Can you find it too? Some stones have been changed from the original position (the three black stones had additional liberties). Also, it would be interesting to know how people rank the level of the problem.
Click Here To Show Diagram Code
[go]$$ White to play
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . O O O O . |
$$ , . O O O X X X O . |
$$ . . O X X . . . X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]



*to me at least

Author:  HermanHiddema [ Sun May 15, 2011 1:05 am ]
Post subject:  Re: Endgame tesuji from a game

Click Here To Show Diagram Code
[go]$$W Black dies
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . O O O O . |
$$ , . O O O X X X O . |
$$ . . O X X . . . X . |
$$ . . . . . . 1 . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


Looks like black is dead after :w1:

Author:  ez4u [ Sun May 15, 2011 1:49 am ]
Post subject:  Re: Endgame tesuji from a game

HermanHiddema wrote:
Click Here To Show Diagram Code
[go]$$W Black dies
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . O O O O . |
$$ , . O O O X X X O . |
$$ . . O X X . . . X . |
$$ . . . . . . 1 . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


Looks like black is dead after :w1:


I must be missing something obvious :scratch:
Click Here To Show Diagram Code
[go]$$W Ko?
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . O O O O . |
$$ , . O O O X X X O . |
$$ . . O X X . 6 . X . |
$$ . . . . . 2 1 4 3 . |
$$ . . . . . . . 5 . . |
$$ --------------------[/go]

Author:  illluck [ Sun May 15, 2011 7:35 am ]
Post subject:  Re: Endgame tesuji from a game

It seems like the change to the original problem affected the solution? Because if the black's three stones had extra liberties then:

Click Here To Show Diagram Code
[go]$$W Black lives
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . c a b O . |
$$ , . O O O X X X O . |
$$ . . O X X . . . X . |
$$ . . . . . . 1 2 . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


If any of a-c is an extra liberty.

So instead:
Click Here To Show Diagram Code
[go]$$W Like this?
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ . . . . . O a b O . |
$$ , . O O O X X X O . |
$$ . . O X X . . . X . |
$$ . . . . . . . . 1 . |
$$ . . . . . . . . . . |
$$ --------------------[/go]

Author:  Redundant [ Sun May 15, 2011 10:58 am ]
Post subject:  Re: Endgame tesuji from a game

Yep, I guess the change to the problem did alter things. IN the actual game, the three stones in a row had three liberties. This looks a lot uglier, but should be more in line with the real problem.

Click Here To Show Diagram Code
[go]$$ White to play
$$ . . . . . . . . . . |
$$ . . . O . O O O . . |
$$ . . . . . . . . O . |
$$ , . O O O X X X O . |
$$ . . O X X . . . X . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ --------------------[/go]


Intended solution:
Click Here To Show Diagram Code
[go]$$W White to play
$$ . . . . . . . . . . |
$$ . . . O . O O O . . |
$$ . . . . . . . . O . |
$$ , . O O O X X X O . |
$$ . . O X X . . 6 X 2 |
$$ . . . . 7 . 3 4 1 . |
$$ . . . . . . . 5 . . |
$$ --------------------[/go]


If someone could help me make this into a nicer looking problem with the same solution, that would be awesome.

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