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Endgame tesuji from a game

Posted: Sat May 14, 2011 7:46 pm
by Redundant
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

Re: Endgame tesuji from a game

Posted: Sun May 15, 2011 1:05 am
by HermanHiddema
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:

Re: Endgame tesuji from a game

Posted: Sun May 15, 2011 1:49 am
by ez4u
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]

Re: Endgame tesuji from a game

Posted: Sun May 15, 2011 7:35 am
by illluck
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]

Re: Endgame tesuji from a game

Posted: Sun May 15, 2011 10:58 am
by Redundant
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.