Life In 19x19

Posted: **Mon Jun 29, 2015 9:05 pm**

Black to live

Click Here To Show Diagram Code: [go] (;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2] RU[Japanese]SZ[19]KM[0.00] PW[White]PB[Black] ;B[qd] ;W[rd] ;B[pd] ;W[rf] ;B[rc] ;W[qf] ;B[qc] ;AB[nd] ;W[ne] ;B[] ;W[nf] ;B[] ;W[me] ;B[] ;W[le] ;B[] ;W[ld] ;B[] ;W[lc] ;B[] ;W[ob] ;AE[qd] ) [/go]

Posted: **Mon Jun 29, 2015 9:30 pm**

well escape...

Posted: **Tue Aug 04, 2015 7:55 pm**

o18 looks like the move to me, i don't see how white can kill black after that but i maybe mistaken.

Posted: **Fri Aug 07, 2015 2:33 pm**

do you also provide solution?

Posted: **Sat Aug 08, 2015 3:02 pm**

Black can't play o18 because white would play p17 and escape.

I don't see a way for black to survive without inferior play from white.

Posted: **Sat Aug 08, 2015 8:50 pm**

How about the sequence below? All White's responses seem forced to prevent Black making a second eye. Black next connects at 'a' and has broken out. The key point is that there isn't space for a second eye in the corner but there seems to be just enough potential that Black can use to drive White along the way.

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

Posted: **Tue Aug 11, 2015 4:44 am**

Dave's reply seems to work.

This also occurred to me:

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

Next black plays at a, sacrifices some bits and gets a living shape in the corner. White has other replies e.g.

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

Click Here To Show Diagram Code: [go]$$Bcm7 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . O . . . . | $$ | . . . . . . . . . . . O . . . . X X . | $$ | . . . , . . . . . , . O . X . X 7 O 9 | $$ | . . . . . . . . . . . O O O O X 6 5 8 | $$ | . . . . . . . . . . . . . O O X O O . | $$ | . . . . . . . . . . . . . . X O 1 3 . | $$ | . . . . . . . . . . . . . . . 2 . 4 . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

And black seems to get a ko at least, so Dave's line is cleaner.

Posted: **Tue Aug 11, 2015 8:45 pm**

drmwc wrote:Dave's reply seems to work.

This also occurred to me:

$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . 9 8 0 . . . . |
$$ | . . . . . . . . . . . . . 3 O a . . . |
$$ | . . . . . . . . . . . O . 5 4 . X X . |
$$ | . . . , . . . . . , . O . X 6 X . O . |
$$ | . . . . . . . . . . . O O O 7 . . . . |
$$ | . . . . . . . . . . . . . O . 1 O O . |
$$ | . . . . . . . . . . . . . . . 2 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------

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

Next black plays at a, sacrifices some bits and gets a living shape in the corner...

Doesn't Black just solidly connect and capture 5 White stones 4 liberties to 3? ;-)

Posted: **Wed Aug 12, 2015 7:56 am**

ez4u wrote:
drmwc wrote:Dave's reply seems to work.

This also occurred to me:

$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . 9 8 0 . . . . |
$$ | . . . . . . . . . . . . . 3 O a . . . |
$$ | . . . . . . . . . . . O . 5 4 . X X . |
$$ | . . . , . . . . . , . O . X 6 X . O . |
$$ | . . . . . . . . . . . O O O 7 . . . . |
$$ | . . . . . . . . . . . . . O . 1 O O . |
$$ | . . . . . . . . . . . . . . . 2 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------

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

Next black plays at a, sacrifices some bits and gets a living shape in the corner...

Doesn't Black just solidly connect and capture 5 White stones 4 liberties to 3?

Looks a bit like the 19-point trick play to me... Black gets a reasonable number of points in the corner, but white has forcing moves to seal him in painfully. White starts with the point below :b7:

and then takes two moves on the left to force black to play inside for the semeai, and white seals black in sente.

Posted: **Wed Aug 12, 2015 9:05 am**

skydyr wrote:Looks a bit like the 19-point trick play to me... Black gets a reasonable number of points in the corner, but white has forcing moves to seal him in painfully.

Did you forget that in the 19-point trickplay both sides have played the same number of moves, but in this one white has 6 more stones?

Life In 19x19

Go problem from my game tonight

Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight

Re: Go problem from my game tonight