Life In 19x19

Posted: **Sun Aug 14, 2011 7:20 am**

To me, more impressive than the problem is that Herman missed something...

Posted: **Sun Aug 14, 2011 6:42 pm**

Perhaps, Kirby, on seeing the solution you'll realise why: it's a really hard-to-find move if you're not looking specifically for it.

The solution:

This is one ordering, it seems other orders are also possible

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . X X . X X X O O O . . | $$ | . . . . . . . . . O 7 O O O B B O . . | $$ | . . . , . . . O . . 0 8 5 X O B O . . | $$ | . . . . . . O . X . . 9 3 2 O B . . . | $$ | . . . . . . . X . . . . 6 1 O B . O . | $$ | . . . . . . . . . . . . . . 4 . . . . | $$ ---------------------------------------[/go]

4 cannot capture, because black will connect underneath and live.

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . 5 . . . . . . . . | $$ | . . . . . . . . X X 2 X X X O O O . . | $$ | . . . . . . . . 6 O X O O O B B O . . | $$ | . . . , . . . O . 1 O O X X O B O . . | $$ | . . . . . . O . X 7 3 X X O O B . . . | $$ | . . . . . . . X 8 . . . O X O B . O . | $$ | . . . . . . . . 9 . . . . 0 O . . . . | $$ ---------------------------------------[/go]

4 fills. 8 is the strongest resistance for White: it breaks the ladder on the left and stops black's snapback on the right. Black can now only get ko.

Posted: **Sun Aug 14, 2011 7:31 pm**

Posted: **Sun Aug 14, 2011 10:17 pm**

Hm, I'd missed that before. Thanks, tchan!

Posted: **Mon Aug 15, 2011 1:49 am**

How did I ever miss that?! :blackeye:

Great problem

I was already exploring variants like this:

Click Here To Show Diagram Code: [go]$$B $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . X X . X X X O O O . . | $$ | . . . . . . . . . O . O O O B B O . . | $$ | . . . , . . . O . . . . . X O B O . . | $$ | . . . . . . O . X . . 2 4 5 O B . . . | $$ | . . . . . . . X . . . 3 6 1 O B . O . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Life In 19x19

Interesting problem

Re: Interesting problem

Re: Interesting problem

Re: Interesting problem

Re: Interesting problem

Re: Interesting problem