[Computer-go] Congratulations to Zen!

Hideki Kato hideki_katoh at ybb.ne.jp
Mon Apr 4 05:46:37 PDT 2011


Dear Jason,

Jason House: <F84048FD-26D0-400C-B84C-2D5C18530535 at gmail.com>:
>On Apr 4, 2011, at 8:15 AM, Hideki Kato <hideki_katoh at ybb.ne.jp> wrote:
>
>> About round9:
>>> In round 9, stv played move 35 as shown in the diagram to the left, 
>>> against Fuego128t. I believe that the upper left white group is now 
>>> dead, as "bent four in the corner".
>> "Bent four in the corner" is a Japanese rule and cannot be applied 
>> with Chinese rules, in which L&D problems should be solved by playing 
>> and this case is a Ko.  I have no idea why
>
>Why white is unconditionally dead is a bit tricky. If white A5, then black will play A7. The 
>key to why the ko is unimportant is recognizing that white can not initiate it. If white 
>plays A4 or B9, they are simply dead. All black must do is wait until everything else is 
>settled, then initiate the exchange B9, A6, A8, A9, B9. At that point, white is in Atari and 
>has no ko threats... AKA, white is unconditionally dead.

I know that and so, if Black knows how to kill then White can do 
nothing.  Ah, I've realised Nick never said "by the rule".  It's my 
confusion, I'd like to say thank you to Jason and sorry to Nick.

Hideki
-- 
Hideki Kato <mailto:hideki_katoh at ybb.ne.jp>



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