ko threat amplification

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  Difficulty: Expert   Keywords: Ko

Enlarging the value of a ko threat, normally before the ko fight starts and usually by means of forcing plays that could themselves serve as threats. That is, in the typical case one player uses a sente sequence in advance of a fight to make a trade-off between number and size of threats available in some part of the board.


tderz: I wonder whether move W173 in this game serves as ko threat amplifier.
I think that this [ext] here is an example:
[ext] Jowa vs. Shinomiya Yonezo (2H-game, 1821) move 173 by Jowa:

  • the ko is at B172
  • later W183 and W189 are much bigger threats than the initial W173:
[Diagram]

Plays 171 - 180

7 at O15
10 at O14

However, because this is complicated stuff, consider my contribution as a question. What is your opinion w.r.t. W173?

[Diagram]

Plays 181 - 190


tderz:Additional question: Which program has an ASCII output, which is immediately ready for Senseis?
(here I used Pand-gGo, but it's a bit a mess)

 +-------------------------------------+
 |. . . . . . . . . . . . . . . . . . .|
 |. O O . O O . . . . . . O . O . . . .|
 |. X X X X O . . . . . X O . . . O . .|
 |. X . O X O . . . , . X O X X X O X .|
 |O O O O O X O . . . X . X O . . O X .|
 |. X . . X X . . . . . . X O O . O X .|
 |. . X . . . . . . . . . . X O O X X X|
 |. . . . . . . . X . . W X X O X O O .|
 |. . X . . . . . . . . O X O O X O . O|
 |. . . , . . . . . X X X O O . X X O .|
 |. X . X . . O O . X O O X X X . X X .|
 |. O X X X X . X O . . . O . . . . . .|
 |. . O X O O X . O . O . . O X . O O .|
 |. . O O . . X . . . . . . X O O . . .|
 |. O X . O O O . O O X . X E X X X X .|
 |. O X X X X O O O X O O . X O O O X .|
 |. X O X . . X X O X X O O O O . X O .|
 |. . . . . . X X X O X X X X O X . O .|
 |. . . . . . . . O . . . . X O O X . .|
 +-------------------------------------+
 +-------------------------------------+
 $. . . . . . . . . . . . . . . . . . .$
 $. O O . O O . . . . . . O . O . . . .$
 $. X X X X O . . . . . X O . . . O . .$
 $. X . O X O . . . , . X O X X X O X .$
 $O O O O O X O . . . X . X O . . O X .$
 $. X . . X X . . . . . . X O O . O X .$
 $. . X . . . . . . . . . . X O O X X X$
 $. . . . . . . . X . . O X X O X O O .$
 $. . X . . . . . . . . O X O O X O . O$
 $. . . , . . . . . X X X O O . X X O .$
 $. X . X . . O O . X O O X X X . X X .$
 $. O X X X X . X O . . . O . . . . . .$
 $. . O X O O X . O . O . . O X . O O .$
 $. . O O . . X . . . . . . X O O . . .$
 $. O X . O O O . O O X . X . X X X X .$
 $. O X X X X O O O X O O . X O O O X .$
 $. X O X . . X X O X X O O O O . X O .$
 $. . . . . . X X X O X X X X O X . O .$
 $. . . . . . . . O . . . . X O O X . .$
 +-------------------------------------+


Dave: Kombilo's "File -> Export current position" has the option to directly produce SL format ("wiki" check box).

tderz: thanks a lot, Dave!


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