KyuExercise45/Attempts

Status?  

LukeNine45: I believe White can live at a and black can kill at b, but I could be wrong because I didn't spend much time looking at it...

 

zinger: carrying on from Hans' , seems to give a ko for life. But -

White dies  

zinger: This kills white - there are no eyes at the top now, and only one in the middle.

 

I saw this for white playing first

zinger: White can live this way, but there is no need to give away a stone at . at threatens ; this is better. See One-Two-Three for more explanation.

Problem II

Ko for Life  

P7A77: I had read the ko response to Problem I before looking at this, but it seems here is the only way for White to live, with Black taking first?

zinger: I think this is right. After a white threat and a black answer, black can conenct at a as a local threat - white must answer at b.

Anon: Black 2 at 3 kills - if white prevents the connection black then plays at 2.

zinger: Aha. Silly me :)

Status=dead  

tderz: Anon, you mean like this?

Status=dead  

tderz: at is safer. Sometimes the sagari is tesuji for +=eye, but White is still dead here after =a.

Status?  

[1] If there is a =, white sometimes might want now to try here. (White would start with =)

Status?  

But nothing happened after .

Dead  

Anon: Like this

White still in trouble  

As with tderz's variation above playing hane at first doesn't help with black a, white b, black c to follow

tderz: True, and in dia ^[1] is a white stone ..

life  

White a and b are mia now. (that's what I meant)
Perhaps it did not make so much sense that I altered a problem and discuss something completely different. I am sorry for the confusion caused ...

ko  

Anon: Here black can still play at to kill. White should play and as below for a ko (or directly at below).

black can't avoid ko  

If tries to avoid ko white is alive since a and b are miai. If at b then white descends to a with . Black has a lot of moves for which lead to ko - taking the ko immediately is best.