On 5 dec, 06:33, sobriquet <dohduh..._at_yahoo.com> wrote:

> I have a further question about a different go problem:

>

> Dong-Dong grouping > (1) ~10k_6350 > (3) 30k~25k > (5) > 2824

>

> Found at GoChild:http://gochild2009.appspot.com/?locale=en_US

>

> http://bayimg.com/pAlAJAAde

>

> The two solutions given are:

> 1) B A9

> 2) B D9, W E5, B A9

>

> Is this the most favorable way to play for both sides regardless of

> whether black or white has more ko-threats?

>

> I was thinking that if white has at least 1 ko-threat more than black,

> I'd expect white to set up a ko by playing at A8 instead of E5 in case

> black tries the 2nd solution in vain.

>

> Is there a difference in the number of ko-threats needed by black to

> kill white in the corner between the

> given solutions?

>

> It seems to me that black would need at least 2 ko-threats more than

> white for the 1st solution to work and only at least 1 ko-threat more

> than white for the 2nd solution to work.

>

> Kind regards and thanks in advance for any ideas, Niek

http://www.lifein19x19.com/forum/viewtopic.php?f=4&p=85474#p85474