BeginnerExercise146/Solution

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Comment: and not really a beginner problem


TalionThe answer to 1 would be to resign. White's upper left group is dead as it stands after black 1. white has lost the game, his best chance is probably to try and defend still while he hopes for black to make a mistake, a slim chance. Oh and since 1 won the game it is obviously the best move for black :)

twold: Winning the game is not a sufficient condition for a move to be considered best. It just means the move is "good enough" :-)

[Diagram]
3 kills  

[Diagram]
another failure  

[Diagram]
another failure  

[Diagram]
another failure  

kb: B1 may be the best move, but I don't think it's possible to kill White. Let's see what happens when White resists:

[Diagram]
Can Black kill?  

If W2, then in order to kill, B must play B3 and follow through with B5 (W4 threatens to make a second eye at B5), but then after W6, Black has a big problem on his hands. If he plays at a, then White takes the ko, and then captures at circle (there are no ko threats large enough!). If he plays at b, then...

[Diagram]
Can Black kill? (b)  
[Diagram]
Can Black kill? (b) (2)  

Black cannot atari at a due to damezumari.

[Diagram]
Can Black kill? (b) (2) bad version  

Black cannot block at a due to damezumari.

[Diagram]
Yes he can kill reply to bad version  

twold: That is correct, but black can simply take two stones and atari at B1. Then if white resists with W2, snapback with B3 at black+circle. So if I am not mistaken, you can delete the following discussion.

Later: ah now I see. There is a mistake in your previous diagram. I'll fix it.


This means Black really can't go for the kill, but he can live with his bottom left group in sente:

[Diagram]
Best play?  
[Diagram]
Best play? (2)  
[Diagram]
Best play? (3), W22 at white+circle, B25 at B19, W26 pass, B27 at white+circle, pass, pass  

Assuming no prisoners prior to the initial diagram, Black has 4 prisoners to White's 2, and 11 points to White's 11. Without komi White would lose by 2 points.



BeginnerExercise146/Solution last edited by Dieter on July 12, 2014 - 21:57
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