Kyu Exercise 1 / Attempts

Sub-page of KyuExercise1
[Diagram]
Live?  

Looks alive to me... if White has sente, should it go like this? Where B4 fills at black+circle again?

[Diagram]
Live?  

ChaoSpectre: Fills at black+circle? Do you mean fills the ko? What about 9 here? Also, is it possible to extend from W1 while retaining the corner (S)? I realize that it is not important to the status of the group at this point but...

[Diagram]
Not sure, but I think so...  

If it's Black's turn to play, it turns out like this? With White alive once again?

[Diagram]
How about this ?  

Dieter

[Diagram]
Ko  

SnotNose: Looks like ko.


(Moved from /Solution).

[Diagram]
Status?  

Dead, I think - Floris

Dieter: This doesn't prove it is dead, but that it is killable. Is it dead already or unsettled? If so, White can live in ko or live?

unkx80: To put it more directly, when a problem asks for the status of a group, it is effectively asking two questions. 1) Black first to play, what is the best result? 2) White first to play, what is the best result?


[Diagram]
White First  

SnotNose: Alive. Classic L+1 group living shape.

[Diagram]
Black First 1  

SnotNose: Dead. Classic L+1 group kill.

[Diagram]
Black First 2  

SnotNose: W2 doesn't work. Here is one way for Black to kill. There are others.


[Diagram]
Black to kill  

Rafael: SnotNose says B1 kills. So this is another problem. After the solution to the original problem is settled, this one could be moved to its own page.

[Diagram]
Black to kill  

unkx80: I think B3 kills "unconditionally". What I am not too sure is, what if W2 is played at B3. I thought it should be a ko.

SnotNose: a and b are miai for the kill.

[Diagram]
Black to kill  

SnotNose: I think unkx80 is right (that perhaps W2 yields a ko). If Black insists on going for a kill, he will have to ignore W4 I think. (The black+circle stones steal the eye at the edge after a throw-in so Black need not respond to W4 right away). Thus, Black can try for the kill with B5. Continuation in next diagram.

[Diagram]
Black to kill  

SnotNose: Unfortuneately, Black cannot chase White all the way to the edge because he is short of liberties. I think the best Black can do is jump out with B9 and fight on the outside. Black is full of cutting points so I think White can break out.

I believe this is the only chance for a kill. Since it fails, White should be at worst alive in ko. Here's one way for ko.

[Diagram]
Black gets ko  

SnotNose: W6 is a good move and almost makes a living shape. B7 through B9 are all forced. Any deviation from these lets White live (I think) unconditionally.

[Diagram]
Black gets ko 2  

SnotNose: Another ko.

[Diagram]
No ko  

SnotNose: Black a, white squeeze at b. No ko this way.

[Diagram]
White lets Black kill  

togo: When getting this far, B9 kills ...

[Diagram]
Ko again!  

togo: ... but White can force a ko on the right side with W8 (W14 on white+circle).


(more attempts copied from the /solution page)

[Diagram]
is white dead?  

GustavoBR: i think this is what should happen... please, post your comments =D

El Draco: I think this belongs in the attempts page. The problem asks for the status with both players to move. Also see the page history for what has already been posted on this page (by Floris) and is essentially the same as you entered.

[Diagram]
black kills  

I'm new to this, but I think white is dead. please post your comments.

[Diagram]
corner  

Schinkenjoe If the ladder doesn´t work black can - depending on the situation to the left - just secure at b or - if there is much white to the left - work up to the ko.

[Diagram]
Another Ko ??  

But only if Black plays weak.

[Diagram]
Failure  

There is a defence P.S: Sorry I overlooked the attempts page. So we got it twice


Kyu Exercise 1 / Attempts last edited by togo on November 19, 2012 - 02:35
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