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tsumego from Davis' tesuji
http://www.lifein19x19.com/viewtopic.php?f=15&t=3602		 Page 1 of 1
Author:  cyclops [ Thu Apr 07, 2011 5:27 pm ]
Post subject:  tsumego from Davis' tesuji
Click Here To Show Diagram Code
[go]$$Wc diagram 0
$$ | . . . . . . . .
$$ | . O O . . . . .
$$ | . X O . . . . .
$$ | . X X O O . . .
$$ | . 4 . X O . . .
$$ | . O . X X O O .
$$ | . O X a 1 X O .
$$ | 3 X . . 2 X O .
$$ | . . b . . . . .
$$ +-----------------[/go]


This position comes from a problem in Davis' tesuji book ( prob 8 p 137 ).
Davis advises black to compromise with B2@a otherwise it is ko after W3 and B4@b.
This makes me suspect that after B4 as in the diagram it is ko or worse for black.
I tried to figure out why.

Here some diagrams, please correct me if I'm wrong.
Click Here To Show Diagram Code
[go]$$c diagram 1
$$ | . . . . . . . .
$$ | . O O . . . . .
$$ | . X O . . . . .
$$ | . X X O O . . .
$$ | . 1 . X O . . .
$$ | . O . X X O O .
$$ | . O X . O X O .
$$ | O X 2 5 X X O .
$$ | . 3 4 . . . . .
$$ +-----------------[/go]


Click Here To Show Diagram Code
[go]$$Wc 5,6 capture and recapture around 7
$$ | . . . . . . . .
$$ | . O O . . . . .
$$ | . X O . . . . .
$$ | . X X O O . . .
$$ | 0 X 4 X O . . .
$$ | 2 O 3 X X O O .
$$ | . O . 7 . X O .
$$ | O . O X X X O .
$$ | 1 . O 8 . 9 . .
$$ +-----------------[/go]


Click Here To Show Diagram Code
[go]$$Wc diagram 3: ko
$$ | . . . . . . . .
$$ | 3 O O . . . . .
$$ | 1 X O . . . . .
$$ | 5 X X O O . . .
$$ | X X X X O . . .
$$ | X O O X X O O .
$$ | 2 O . O 4 X O .
$$ | O . O X X X O .
$$ | O . O X . O . .
$$ +-----------------[/go]


edit: BTW: the main problem states that w is supposed to make a sacrifice. It turns out that if B is clever he does not accept the sacrifice but compromises. So the sacrifice is virtual.
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