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BeginnerExercise106

 

Beginner Exercise 106 Solution
  Difficulty: Beginner   Keywords: Problem

[Diagram]
Life

Black can live with a play at the point 1, a or b.

HolIgor: Since beginners don't reply for a long time, I will give my solution.

I don't see how White kills unconditionally. It is a ko (worth 16 points, which is 8 points miai counting).


[Diagram]
Ko

After White 1, Black has no choice but to play 2 threatening to kill the invader and live. White captures 3 and now Black has to find a ko threat to prevent White from direct capture.



The ko is quite large but... a note not for beginners.

[Diagram]
A yose move in a popular joseki

Black 1 is worth 12 points and no ko involved.

So, White should not try to kill too early in the game. If White plays 1 and 3 in the diagram above she still has to spend a move to complete the capture, while Black can simply make ordinary middle game moves not worrying about that corner too much. It is bad for Black to spend ko-threats for such a small profit. But in the early yose this ko becomes large enough.





This is a copy of the living page "Beginner Exercise 106 Solution" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.