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kyu problem
http://www.lifein19x19.com/viewtopic.php?f=15&t=12087
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Author:  leichtloeslich [ Fri Jul 24, 2015 5:13 am ]
Post subject:  kyu problem

Ever have your opponent play a ko threat and you're like
Image
and then you connect the ko and then you resign 3 moves later?

Here's an easy kyu tsumego that resulted from that exact situation. White to live with those middle 6 stones. It's kind of obvious, but make sure you read it out completely
Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O X X O O O O O X . O . . . |
$$ | . . . O . O . X X O X X X X . O . O . |
$$ | . . . , . . X . . X O X . . . , O . . |
$$ | . . . . . . . . . . O X . X . . . O . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]

Author:  Knotwilg [ Fri Jul 24, 2015 6:54 am ]
Post subject:  Re: kyu problem

I think I know what you're after but after 7 forcing moves and answers, :w15: leaves Black in a loose ladder and White's top group has two liberties. At that point, Black can atari that group from the inside. Or there's a variation I'm missing but in any case I wouldn't call it obvious.

Author:  DrStraw [ Fri Jul 24, 2015 7:24 am ]
Post subject:  Re: kyu problem

Knotwilg, I think you are overlooking one simple thing:

The trick is to not threaten to connect out to the right as that reduces white's liberties by one.
Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . 3 4 1 . . . 2 . . . . . . |
$$ | . . . . . O X X O O O O O X . O . . . |
$$ | . . . O . O 0 X X O X X X X . O . O . |
$$ | . . . , . . X 9 5 X O X . . . , O . . |
$$ | . . . . . . . . 7 6 O X . X . . . O . |
$$ | . . . X . . . . . 8 . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]


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

Author:  leichtloeslich [ Mon Jul 27, 2015 10:27 am ]
Post subject:  Re: kyu problem

since the first problem was such a hit, here another little reading exercise from a recent game. Black to reduce white's "territory". This one should really be easy.
Click Here To Show Diagram Code
[go]$$B
$$ +--------------------
$$ | . . X X O . . . . .
$$ | X X . X O X . . . .
$$ | O O X X O X X X . X
$$ | . . O , O . O . . ,
$$ | . O . . . . O . . .
$$ | . O X . . . O . . .
$$ | . . O . . . O . . .
$$ | . X O X . . O . . .
$$ | . X X O . O . O . .
$$ | . . . O . . . . . ,
$$ | . . X . . . . . . .[/go]



Quote:
in any case I wouldn't call it obvious

The points is that every move is essentially forced, you just have to do the work and count the liberties carefully. Kind of like that spiral ladder problem from Kageyama's Lessons in the Fundamentals of Go:
Click Here To Show Diagram Code
[go]$$B black to capture the cutting stones
$$ --------------------+
$$ . . . . . . . O . . |
$$ . . . . . X O . . . |
$$ . . . . X X X O O . |
$$ , . . . . Q Q X . . |
$$ . . . X . . . X . . |
$$ . . . . . O . . . . |
$$ . . . . . . . X . . |
$$ . . . . . . O X . . |
$$ . . . . . . O X . . |
$$ , . . . . . , . . . |
$$ . . . . . . . . . . |[/go]

(I assume it's alright to post this problem here, if not then I'll remove it)

I would also consider that an easy problem, since there's no branching whatsoever. You just have to place the stones on your mental goban.

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