Ko threat exercise 2

  Difficulty: Intermediate   Keywords: Ko, Problem
t:1141
[Diagram]
Ko threats  

a Threatens to make Black's group live. White must respond at the other a. The value of this threat is nearly 30 points.

b Black playing at b threatens to make a monkey jump to 'x' in sente. White must answer one point below b. This threat is worth about ten points.

c Threatens to connect Black's dead group with his live corner by playing y. White must respond at y. c is generally better than y because after White responds at c, Black has added a stone to his dead group. c is an example of a ko threat that you wanted to play even without the ko. The value of this threat is almost 40 points.

In rare cases, y will be better than c, because it leaves a second threat at v. However, loss making threats like these are, as a rule, bad.

d Threatens to kill the white group. White must answer at z (the two points are miai, and Black could also have played z as a threat). The value of this threat is 30 points.

e White playing at e threatens to cut the two black groups apart. Each of them only has one eye, so they will die. Black must respond at f. White f is also a threat, but it loses points, while f takes a point of territory away from Black. The value of this threat is more than 50 points.

g These are small threats to reduce White's territory.


Ko threat exercise 2 last edited by Dieter on January 9, 2013 - 19:02
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