This is like proving a theorem by writing "Suppose that" and nothing else.
I thought the read-out after that first move is blatantly obvious...
After reading what everybody else said... all but one. make that two, so far have read the same thing I have....
That's funny, because everyone prior to when you posted were also incorrect. I should also mention this is a dan-level problem.
Re: A Go Problem for you to solve!
Posted: Sat May 29, 2010 7:26 am
by GoCat
@hiyayang: Very nice. Now if I can just get to the point where I can do all that in my head, during a game....
Re: A Go Problem for you to solve!
Posted: Sat May 29, 2010 8:17 am
by MountainGo
I've been working on this, and I haven't found the solution yet, but I have the feeling it's going to be one of those ridiculously long, crazy ones.
Re: A Go Problem for you to solve!
Posted: Sat May 29, 2010 8:46 am
by Chew Terr
Hiyayang: Wow, even more complex than I'd thought!
Kirby:
Thanks, this is a really cool problem. It sprawls over a large scale and has a lot of things that seem to almost work, except for the hidden trap. Cool problem, thanks for sharing.
Re: A Go Problem for you to solve!
Posted: Sat May 29, 2010 9:10 am
by Solomon
Those who are up for a challenge may want to consider this slightly different problem (also cut away the excess from Kirby's problem with a shorter ladder-breaker). The thing about the problem posted by Kirby is that E13 is suboptimal play from White in response to Black E14:
$$Bcm1 $$ ------------------------- $$ | . . . . . . . . . . . . $$ | . . O O . . . O O . . . $$ | . . O X X X X X O . O . $$ | . . . O O O X O X X . . $$ | . . . . X X O O . . . . $$ | . . . . . . . . . X . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . O . $$ | . . . . . . . . . . . .
[go]$$Bcm1 $$ ------------------------- $$ | . . . . . . . . . . . . $$ | . . O O . . . O O . . . $$ | . . O X X X X X O . O . $$ | . . . O O O X O X X . . $$ | . . . . X X O O . . . . $$ | . . . . . . . . . X . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . O . $$ | . . . . . . . . . . . .[/go]
Re: A Go Problem for you to solve!
Posted: Sat May 29, 2010 11:39 am
by Tommie
I was very happy & proud when I solved that problem some 5 years ago (found the first move), then another one and made some small error some 20 moves later.
Re: A Go Problem for you to solve!
Posted: Sat May 29, 2010 12:22 pm
by HermanHiddema
Araban wrote:Those who are up for a challenge may want to consider this slightly different problem (also cut away the excess from Kirby's problem with a shorter ladder-breaker). The thing about the problem posted by Kirby is that E13 is suboptimal play from White in response to Black E14:
$$Bcm1 $$ ------------------------- $$ | . . . . . . . . . . . . $$ | . . O O . . . O O . . . $$ | . . O X X X X X O . O . $$ | . . . O O O X O X X . . $$ | . . . . X X O O . . . . $$ | . . . . . . . . . X . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . O . $$ | . . . . . . . . . . . .
[go]$$Bcm1 $$ ------------------------- $$ | . . . . . . . . . . . . $$ | . . O O . . . O O . . . $$ | . . O X X X X X O . O . $$ | . . . O O O X O X X . . $$ | . . . . X X O O . . . . $$ | . . . . . . . . . X . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . O . $$ | . . . . . . . . . . . .[/go]
$$Bcm1 $$ ------------------------- $$ | . . . . . . . . . . . . $$ | . . O O . . . O O . . . $$ | . . O X X X X X O . O . $$ | . . . O O O X O X X . . $$ | . . . . X X O O . . . . $$ | . . . . 1 8 3 4 7 X . . $$ | . . . 2 x 9 6 5 . . . . $$ | . . . . . . . . . . O . $$ | . . . . . . . . . . . .
[go]$$Bcm1 $$ ------------------------- $$ | . . . . . . . . . . . . $$ | . . O O . . . O O . . . $$ | . . O X X X X X O . O . $$ | . . . O O O X O X X . . $$ | . . . . X X O O . . . . $$ | . . . . 1 8 3 4 7 X . . $$ | . . . 2 x 9 6 5 . . . . $$ | . . . . . . . . . . O . $$ | . . . . . . . . . . . .[/go]
Ko.
at x, as Kirby has it, is much harder to punish, but if punished correctly leads to unconditional capture of the white stones. This is also a double ladder breaker, but it only gives black a ko, instead of an unconditional kill
Re: A Go Problem for you to solve!
Posted: Mon May 31, 2010 5:41 pm
by Kirby
Congratulations to hiyayang, who got the solution correct.
For completeness, the solution to the problem that I originally posed is as follows (which is basically that which hiyayang has already explained).
at x, as Kirby has it, is much harder to punish, but if punished correctly leads to unconditional capture of the white stones. This 
at 
.