l&d from a game

bayu · Post by **bayu** » Sat Nov 09, 2013 12:14 pm

From a 9x9-game I played on OGS against a 1d. Looks like a standard shape (and maybe there is a standard answer), but I had to resort to non-standard solutions (well, for my (3k) standard of standard ;). I found it highly instructive and enjoyable. You might too:

White to live:

Click Here To Show Diagram Code: [go]$$W $$ ---------------------- $$ | . . . . . . O . . | $$ | . . . X . X O . B | $$ | . . . . X . . . . | $$ | . . . . . X O . O | $$ | . . . . X . O O X | $$ | . . . . X O O X . | $$ | . . . X . X X . X | $$ | . . . . . . . . . | $$ | . . . . . . . . . | $$ ----------------------[/go]

If you think "I only see ko", think harder.

SoDesuNe · Post by **SoDesuNe** » Sat Nov 09, 2013 12:23 pm

Ahh, missed something:

Click Here To Show Diagram Code: [go]$$Wc The obvious Ko? 1 $$ ---------------------- $$ | . . . . . . O . . | $$ | . . . X . X O . B | $$ | . . . . X . 3 2 . | $$ | . . . . . X O . O | $$ | . . . . X . O O X | $$ | . . . . X O O X 1 | $$ | . . . X . X X . X | $$ | . . . . . . . . . | $$ | . . . . . . . . . | $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Wc The obvious Ko? 2 $$ ---------------------- $$ | . . . . . . O . . | $$ | . . . X . X O . X | $$ | . . . . X . O X . | $$ | . . . . . X O . O | $$ | . . . . X . O O 4 | $$ | . . . . X O O X 7 | $$ | . . . X . X X 5 X | $$ | . . . . . . . 6 . | $$ | . . . . . . . . . | $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Wc The obvious Ko? 3 $$ ---------------------- $$ | . . . . . . O . . | $$ | . . . X . X O 9 X | $$ | . . . . X . O X . | $$ | . . . . . X O . O | $$ | . . . . X . O O 0 | $$ | . . . . X O O X O | $$ | . . . X . X X 8 X | $$ | . . . . . . . X . | $$ | . . . . . . . . . | $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Wcm11 The obvious Ko? 4 $$ ---------------------- $$ | . . . . . . O . . | $$ | . . . X . X O O X | $$ | . . . . X . O X . | $$ | . . . . . X O 1 O | $$ | . . . . X . O O X | $$ | . . . . X O O X . | $$ | . . . X . X X X X | $$ | . . . . . . . X . | $$ | . . . . . . . . . | $$ ----------------------[/go]

bayu · Post by **bayu** » Sat Nov 09, 2013 12:40 pm

for all: You can assume that black has a fair amount of external ko threads.

sodesune:

your first answer:
I agree with a lot of what you say. But in the last diagram, white has a better 3, although there is a lot of damage. And anyway, white has a better 1.

your second answer:
I don't agree with your 1. Ko was no option.

leichtloeslich · Post by **leichtloeslich** » Sat Nov 09, 2013 12:45 pm

SoDesuNe:

Another variation for b to capture some stones, but I think white lives.

edit:
I suppose we could force this:

SoDesuNe · Post by **SoDesuNe** » Sat Nov 09, 2013 12:49 pm

Ahaha, yeah,

makes sense : )

Well, I only added the Ko because I thought White could win it anyway. Your "[...] black has a fair amount of external ko threads" makes it clearer, thanks.

Bill Spight · Post by **Bill Spight** » Sun Nov 10, 2013 3:00 pm

Click Here To Show Diagram Code: [go]$$Wc Black komaster, White to live $$ ---------------------- $$ | . . . . . . O . 2 | $$ | . . . X . X O 1 X | $$ | . . . . X . . . . | $$ | . . . . . X O . O | $$ | . . . . X . O O X | $$ | . . . . X O O X . | $$ | . . . X . X X . X | $$ | . . . . . . . . . | $$ | . . . . . . . . . | $$ ----------------------[/go]

Where next?

cyclops · Post by **cyclops** » Sun Nov 10, 2013 3:32 pm

Bill Spight wrote:....

Where next?

Life In 19x19

l&d from a game

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