Macelee's study journal of interesting pro games: 2013-11-02

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macelee
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Macelee's study journal of interesting pro games: 2013-11-02

Post by macelee »

An interesting life and death problem in a pro game:
Click Here To Show Diagram Code
[go]$$B Black to play
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X . . . . . . X O . . X . . . . . |
$$ | X O O X X X X . . X O . X O X X . . . |
$$ | O . . O . O . . . O O . . . O , X X . |
$$ | . O O . . . . X . . . . X . . . . O . |
$$ | . . . . O X X . O . O . . . . . . . . |
$$ | . . O . O X O . O . . O . O . O . O . |
$$ | . . O O X O O . O . . . . . X O . . . |
$$ | . . X X X X X X X X X X O O O X X . . |
$$ | . . . , . . . . . , O O X X X , X . . |
$$ | . . X . . X O . O . . . O X . X . O . |
$$ | . . X O . X X O . . O O O O O X X O . |
$$ | . . . . . . . O . O X O X X X X O . . |
$$ | . . X O . X . O . . X X O . X O O O . |
$$ | . X X . X . . . . . X . X . . X . . . |
$$ | . O X , . . . . . , X O O . X , X O . |
$$ | O . O O O O X X X . . X . O . O O . . |
$$ | . O . . . . O O X . . . X O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]

Solution: http://www.go4go.net/go/games/sgfview/37434/151

Variations:
Click Here To Show Diagram Code
[go]$$B :w2: key point, just enough room for 2 eyes
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X . . . . . . X O . . X . . . . . |
$$ | X O O X X X X . . X O . X O X X . . . |
$$ | O . . O . O . . . O O . . . O , X X . |
$$ | . O O . . . . X . . . . X . . . . O . |
$$ | . . . . O X X . O . O . . . . . . . . |
$$ | . . O . O X O . O . . O . O . O . O . |
$$ | . . O O X O O . O . . . . . X O . . . |
$$ | . . X X X X X X X X X X O O O X X . . |
$$ | . . . , . . . . . 2 O O X X X , X . . |
$$ | . . X . . X O . O . . . O X . X . O . |
$$ | . . X O . X X O . . O O O O O X X O . |
$$ | . . . . . . . O . O X O X X X X O . . |
$$ | . . X O . X . O . 1 X X O . X O O O . |
$$ | . X X . X . . . . . X . X . . X . . . |
$$ | . O X , . . . . . , X O O . X , X O . |
$$ | O . O O O O X X X . . X . O . O O . . |
$$ | . O . . . . O O X . . . X O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
Click Here To Show Diagram Code
[go]$$B :b3: is a tesuji to destroy the eye
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X . . . . . . X O . . X . . . . . |
$$ | X O O X X X X . . X O . X O X X . . . |
$$ | O . . O . O . . . O O . . . O , X X . |
$$ | . O O . . . . X . . . . X . . . . O . |
$$ | . . . . O X X . O . O . . . . . . . . |
$$ | . . O . O X O . O . . O . O . O . O . |
$$ | . . O O X O O . O . . . . . X O . . . |
$$ | . . X X X X X X X X X X O O O X X . . |
$$ | . . . , . . . . . , O O X X X , X . . |
$$ | . . X . . X O . O 2 . . O X . X . O . |
$$ | . . X O . X X O . 1 O O O O O X X O . |
$$ | . . . . . . . O 3 O X O X X X X O . . |
$$ | . . X O . X . O 5 4 X X O . X O O O . |
$$ | . X X . X . . . . . X . X . . X . . . |
$$ | . O X , . . . . . , X O O . X , X O . |
$$ | O . O O O O X X X . . X . O . O O . . |
$$ | . O . . . . O O X . . . X O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
Click Here To Show Diagram Code
[go]$$B bent 3 dead
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X . . . . . . X O . . X . . . . . |
$$ | X O O X X X X . . X O . X O X X . . . |
$$ | O . . O . O . . . O O . . . O , X X . |
$$ | . O O . . . . X . . . . X . . . . O . |
$$ | . . . . O X X . O . O . . . . . . . . |
$$ | . . O . O X O . O . . O . O . O . O . |
$$ | . . O O X O O . O . . . . . X O . . . |
$$ | . . X X X X X X X X X X O O O X X . . |
$$ | . . . , . . . . . 4 O O X X X , X . . |
$$ | . . X . . X O . O 3 5 . O X . X . O . |
$$ | . . X O . X X O . 1 O O O O O X X O . |
$$ | . . . . . . . O 2 O X O X X X X O . . |
$$ | . . X O . X . O . . X X O . X O O O . |
$$ | . X X . X . . . . . X . X . . X . . . |
$$ | . O X , . . . . . , X O O . X , X O . |
$$ | O . O O O O X X X . . X . O . O O . . |
$$ | . O . . . . O O X . . . X O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
Click Here To Show Diagram Code
[go]$$B :b7: to make bent 3 in sente before :b11: = 'a' to kill
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | X X X . . . . . . X O . . X . . . . . |
$$ | X O O X X X X . . X O . X O X X . . . |
$$ | O . . O . O . . . O O . . . O , X X . |
$$ | . O O . . . . X . . . . X . . . . O . |
$$ | . . . . O X X . O . O . . . . . . . . |
$$ | . . O . O X O . O . . O . O . O . O . |
$$ | . . O O X O O . O . . . . . X O . . . |
$$ | . . X X X X X X X X X X O O O X X . . |
$$ | . . . , . . . . 0 8 O O X X X , X . . |
$$ | . . X . . X O . O 7 9 . O X . X . O . |
$$ | . . X O . X X O . 1 O O O O O X X O . |
$$ | . . . . . . . O 6 O X O X X X X O . . |
$$ | . . X O . X . O 3 2 X X O . X O O O . |
$$ | . X X . X . . a 4 5 X . X . . X . . . |
$$ | . O X , . . . . . , X O O . X , X O . |
$$ | O . O O O O X X X . . X . O . O O . . |
$$ | . O . . . . O O X . . . X O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
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