crush the ko

  Difficulty: Intermediate   Keywords: Ko

Crushing the ko is a technique to avoid a ko fight. It will only work when the opponent is very low on liberties. Sometimes it's a form of connect-and-die and in other cases it's a form of oshi-tsubushi.

A ko can be crushed, if after opponent's ko capture one can give atari to the ko stones from the outside, and the opponent is suffering from a liberty problem so that he cannot connect his stones out.

[Diagram]
Crushing the ko  

Here black wants to utilize a ko technique to force white to defend against the upcoming double atari. White W2 captures B1 without fighting the ko.

[Diagram]
Six in the corner, 2 liberties  

This shape is alive because white can force black to a ko, which white then crushes.

[Diagram]
Black's strongest attempt  
[Diagram]
White can crush the ko.  

White can avoid the ko because she has enough outside liberties to play W6.


crush the ko last edited by Dieter on January 9, 2013 - 18:31
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