Kyu Exercise 1 / Attempts

Sub-page of KyuExercise1
Live?

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

Live?

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

Not sure, but I think so...

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

Ko

SnotNose: Looks like ko.

(Moved from /Solution).

Status?

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?

White First

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

Black First 1

SnotNose: Dead. Classic L+1 group kill.

Black First 2

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

Black to kill

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

Black to kill

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

SnotNose: a and b are miai for the kill.

Black to kill

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

Black gets ko

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

Black gets ko 2

SnotNose: Another ko.

No ko

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

White lets Black kill

togo: When getting this far, kills ...

Ko again!

togo: ... but White can force a ko on the right side with ( on ).

(more attempts copied from the /solution page)

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.

black kills

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.

Another Ko ??

But only if Black plays weak.

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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