My first post on this forum. What is the difficulty of this problem?
(;GM[1]FF[4]SZ[19]GN[White to play]PL[W]AB[rn][qo][hp][jp][op][pp][qp][eq][fq][hq][jq][kq][nq][rq][dr][er][fr][gr][hr][ir][nr][qr][hs]AW[qm][gn][qn][ho][io][jo][lo][no][oo][po][dp][ep][fp][gp][ip][kp][np][bq][dq][gq][iq][lq][mq][oq][cr][or][pr][ds];)
White to play.
EDIT: Looks like it is now possible to use SL diagram codes instead.
$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . . . . X O O X . . | $$ | . . . O . . . X . . . . . . . . . . . | $$ ---------------------------------------
[go]$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . . . . X O O X . . | $$ | . . . O . . . X . . . . . . . . . . . | $$ ---------------------------------------[/go]
Re: 2010 April 20 problem
Posted: Tue Apr 20, 2010 5:00 am
by Loons
I see a two step ko fairly directly, and I'm 5 kyu, but I tend to be terrible at problems.
Re: 2010 April 20 problem
Posted: Tue Apr 20, 2010 7:25 am
by Chew Terr
I have an attempt:
Black seems to have no real answer to L1.
If L2, M2 then K2 after black connects. If K2, K1 then sacrifice the two stones and make the eye false.
Not at all sure if my answer is right, but I'm 7k, as an estimate for what rank it is.
Re: 2010 April 20 problem
Posted: Tue Apr 20, 2010 7:32 pm
by runaway
Okay so I was thinking White L2 first, then K2, K1, M2, M1 ko but 1,2,3 popped into my head as is said on sensei's so I went to see K1 first. It kills without any complications. The problem should be around 5 kyu KGS with reading and 2 kyu KGS on blitz.
EDIT: corrected popped from the word with double o's
Re: 2010 April 20 problem
Posted: Tue Apr 20, 2010 9:48 pm
by Solomon
Chew Terr wrote:I have an attempt:
Black seems to have no real answer to L1.
If L2, M2 then K2 after black connects. If K2, K1 then sacrifice the two stones and make the eye false.
Not at all sure if my answer is right, but I'm 7k, as an estimate for what rank it is.
Black can just K1 and live.
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 1:21 am
by unkx80
So far, none of the attempts are correct. I think this problem might be of dan level. Now that diagrams are enabled, please post diagrams instead. I find it difficult to read coordinates. Thanks!
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 2:41 am
by SoDesuNe
runaway
I think K1 doesn't work because of...
$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 2 . 4 5 X O O X . . | $$ | . . . O 7 8 . X . 1 3 6 . . . . . . . | $$ ---------------------------------------
[go]$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 2 . 4 5 X O O X . . | $$ | . . . O 7 8 . X . 1 3 6 . . . . . . . | $$ ---------------------------------------[/go]
$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O b . X . | $$ | . . O X X X X X X 2 8 4 6 X O O X . . | $$ | . . . O . . . X 0 1 3 5 9 7 a . . . . | $$ ---------------------------------------
[go]$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O b . X . | $$ | . . O X X X X X X 2 8 4 6 X O O X . . | $$ | . . . O . . . X 0 1 3 5 9 7 a . . . . | $$ ---------------------------------------[/go]
White a, Black b, White loses all the stones.
My try:
$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 2 1 4 . X O O X . . | $$ | . . . O . . . X . 3 . 5 . . . . . . . | $$ ---------------------------------------
[go]$$Wc White to play $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 2 1 4 . X O O X . . | $$ | . . . O . . . X . 3 . 5 . . . . . . . | $$ ---------------------------------------[/go]
The obvious Ko. ^^
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 2:48 am
by unkx80
To all: ko is not the solution.
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 6:00 am
by Marcus
Guess I'll have to give this a go ... I had no trouble solving it, and I'm 4k KGS ... granted, I read well sometimes. Maybe 3-5k level problem?
EDIT: zinger pointed out a problem with my solution. I fixed it, so I'm adding it to this as well. Maybe the problem is a little harder than I thought ...
First move is obvious, I think:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . . . . X O O X . . | $$ | . . . O . . . X . 1 . . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . . . . X O O X . . | $$ | . . . O . . . X . 1 . . . . . . . . . | $$ ---------------------------------------[/go]
This is an immediate threat to the life of the Black group. White must respond. Variations below:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 2 . 3 . X O O X . . | $$ | . . . O . . . X . 1 . . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 2 . 3 . X O O X . . | $$ | . . . O . . . X . 1 . . . . . . . . . | $$ ---------------------------------------[/go]
(above) Easiest way to kill. White can easily falsify Black's eye, and is not in danger of losing his stones.
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 3 4 2 5 X O O X . . | $$ | . . . O 7 9 . X 6 1 8 . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 3 4 2 5 X O O X . . | $$ | . . . O 7 9 . X 6 1 8 . . . . . . . . | $$ ---------------------------------------[/go]
(above) White 1 and 3 are captured, but Black has only a single eye and is dead. Note that Black cannot play 8 at 9, because then ther is no way to approach White 1 or White 3 (Golden Chicken! My favourite shape!)
(below) White's last meaningful response that I can see ...
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . . O 3 . . X . 1 . . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . . O 3 . . X . 1 . . . . . . . . . | $$ ---------------------------------------[/go]
White might play from here in one of two ways ...
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 3 4 . X b 1 5 7 a . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 3 4 . X b 1 5 7 a . . . . . . | $$ ---------------------------------------[/go]
(above) We get another Golden Chicken shape, wher Black cannot play at a or b.
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O B O . . X . | $$ | . . O X X X X X X . 2 . . B O O X . . | $$ | . . . O 3 5 . X . 1 4 . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O B O . . X . | $$ | . . O X X X X X X . 2 . . B O O X . . | $$ | . . . O 3 5 . X . 1 4 . . . . . . . . | $$ ---------------------------------------[/go]
(above) No matter what, White will capture the two marked Black stones. Black is reduced to a single eye.
EDIT:
As pointed out by zinger, in one of my diagrams, Black lives with some of his stones ... so I found a better way to play it. First, the diagram involved:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . a O 3 4 . X . 1 5 7 . b . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . a O 3 4 . X . 1 5 7 . b . . . . . | $$ ---------------------------------------[/go]
Black can take the two White stones by playing at a. If White falsifies that eye, Black is no longer bound by my Golden Chicken shape and can approach the stones at White 1, capturing them. White's best move is to capture the chain of Black stones with b and Black gest a smaller group with a 2nd eye.
There is a better way, though. White has a better move 3:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . . O . 3 . X . 1 . . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . . O . 3 . X . 1 . . . . . . . . . | $$ ---------------------------------------[/go]
Looks a bit funny, right? However, it threatens to really take that eye away:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . . O 5 3 . X . 1 4 . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . . O 5 3 . X . 1 4 . . . . . . . . | $$ ---------------------------------------[/go]
No more eye.
So, Black needs to respond. Two responses preserve the eye:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 4 3 . X . 1 5 7 . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 4 3 . X . 1 5 7 . . . . . . . | $$ ---------------------------------------[/go]
Golden Chicken makes a comeback!
The other way to preserve an eye:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O a 3 4 X . 1 5 7 . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O a 3 4 X . 1 5 7 . . . . . . . | $$ ---------------------------------------[/go]
And again we have our Golden Chicken. It's important to note that White did not connect at a. There's a proverb: "Capture 3 on the edge to make an eye". Black can get his eye no matter what, so White needs to continue to play forcing moves. Playing at a does not force Black. Here's the failure line:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . 6 O 5 3 4 X . 1 . . . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X . 2 . . X O O X . . | $$ | . . 6 O 5 3 4 X . 1 . . . . . . . . . | $$ ---------------------------------------[/go]
And then:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 7 B 4 6 X O O X . . | $$ | . . W 1 2 . B X 8 W 3 5 . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 7 B 4 6 X O O X . . | $$ | . . W 1 2 . B X 8 W 3 5 . . . . . . . | $$ ---------------------------------------[/go]
Because White 1 in the second diagram is captured, Black gets both his eye and the ability to approach at Black 8.
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 6:23 am
by zinger
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 3 4 . X b 1 5 7 a . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 3 4 . X b 1 5 7 a . . . . . . | $$ ---------------------------------------[/go]
Interesting but black can capture two stones to the left with 10, living. Although even this feels like a success for white. But if white can truly kill, this feels like it is on the right track.
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 6:56 am
by Marcus
zinger wrote:
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 3 4 . X b 1 5 7 a . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 3 4 . X b 1 5 7 a . . . . . . | $$ ---------------------------------------[/go]
Interesting but black can capture two stones to the left with 10, living. Although even this feels like a success for white. But if white can truly kill, this feels like it is on the right track.
Perhaps 9 to the right of a?
I tried the suggested 9, but it loses to the time-honored "one-eye-vs-no-eye" rule.
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O b . X . | $$ | . . O X X X X X X 0 2 6 8 X O O X . . | $$ | . . . O 3 4 . X d 1 5 7 a 9 c . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O b . X . | $$ | . . O X X X X X X 0 2 6 8 X O O X . . | $$ | . . . O 3 4 . X d 1 5 7 a 9 c . . . . | $$ ---------------------------------------[/go]
Guess this is not the answer, though White gains a good deal. White 3 looks like the problem. Here's another try, then ...
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 4 3 . X . 1 5 7 . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O 4 3 . X . 1 5 7 . . . . . . . | $$ ---------------------------------------[/go]
Looks better. Try a different Black 4 now ...
$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O . 3 4 X . 1 5 7 . . . . . . . | $$ ---------------------------------------
[go]$$Wc $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ | . . . . . . O . . . . . . . . . O X . | $$ | . . . . . . . O O O . O . O O O X . . | $$ | . . . O O O O X O X O . . O X X X . . | $$ | . O . O X X O X O X X O O X O . . X . | $$ | . . O X X X X X X 9 2 6 8 X O O X . . | $$ | . . . O . 3 4 X . 1 5 7 . . . . . . . | $$ ---------------------------------------[/go]
Golden Chicken again. Looks like I got it.
Re: 2010 April 20 problem
Posted: Wed Apr 21, 2010 12:30 pm
by unkx80
Marcus' modified attempt is the solution. So, given the attempts on SL and here, I think I should lower the difficulty rating a bit: probably 3 kyu to 1 dan.
Looks like I got it.