Some situations from recent games

HermanHiddema · Post by **HermanHiddema** » Tue Sep 27, 2011 6:44 am

Here's some situations from recent games of mine. In each, the purposes is to get the best result, which may mean you kill, you live, make seki or ko, or maybe you just gain a few points.

(edited to add solutions)

Click Here To Show Diagram Code: [go]$$W White to play $$ ------------------+ $$ . . . O . . . . . | $$ X . O . O X X X . | $$ . . . O X O O O . | $$ X . . O X X X . . | $$ . . . O X . . . . | $$ X . . O X O X X . | $$ . . . X O . O O . | $$ . . . . . . . . . | $$ . . . . . . . . . | $$ . . . . . . . . . |[/go]

Solution:

Click Here To Show Diagram Code: [go]$$W White to play $$ . . . . . . . . . . . . . . | $$ . . . . . . . . . . . . . . | $$ . . . . . . . . . . . . . . | $$ . . . . . . . . . . . . . . | $$ . . . O O O . O . . . . . . | $$ . . . O X X O . . . . . . . | $$ . O O X . . X O O O O . . . | $$ . O X . X . X O X . . O O . | $$ . O X . . . . X . X X X O . | $$ ----------------------------+[/go]

Solution:

Click Here To Show Diagram Code: [go]$$W White to play $$ +---------------------------------------+ $$ | . . . X . . . . X . . . . . . . . . . | $$ | . . X O O O . X O X . X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O . X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

Solution:

Click Here To Show Diagram Code: [go]$$W @ White kills if black persists ('a' is auto-atari) $$ +---------------------------------------+ $$ | . . . X . . 3 4 X 1 2 8 7 . . . . . . | $$ | . . X O O O 5 X O X . X O X X O . . . | $$ | . X . X O . O O O X a X X O O O . . . | $$ | . . . X O . O X O O 9 X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

Black cannot play like the above, so:

Click Here To Show Diagram Code: [go]$$W elsewhere. White lives, and gets to play 'a' later $$ +---------------------------------------+ $$ | . . . X . . 3 a X 1 2 . . . . . . . . | $$ | . . X O O O . X O X . X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O . X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

Click Here To Show Diagram Code: [go]$$W Reference diagram $$ +---------------------------------------+ $$ | . . . X 5 . 1 2 X 4 . . . . . . . . . | $$ | . . X O O O 3 X O X . X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O . X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

This way to live is simple but uninspired. The main line above gains several points compared to this.

Click Here To Show Diagram Code: [go]$$W White to play $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . O . . . . . . $$ | . X O X . . . . . $$ | . . X O O . . . . $$ | . X X X O . . . . $$ | X O X X O . . . . $$ | . O X O O . . . . $$ | O . O X . O . . . $$ | . O O X X X . . . $$ | . X X O X O . X . $$ | . . . O X . . . . $$ | . . . . . . . . . $$ +------------------[/go]

Solution:

daniel_the_smith · Post by **daniel_the_smith** » Tue Sep 27, 2011 7:09 am

#1:

entropi · Post by **entropi** » Tue Sep 27, 2011 8:20 am

Click Here To Show Diagram Code: [go]$$W White to play $$ ------------------+ $$ . . . O . . . . . | $$ X . O . O X X X . | $$ . . . O X O O O . | $$ X . . O X X X 1 . | $$ . . . O X . 2 . 3 | $$ X . . O X O X X 4 | $$ . . . X O . O O 5 | $$ . . . . . . . . . | $$ . . . . . . . . . | $$ . . . . . . . . . |[/go]

Click Here To Show Diagram Code: [go]$$W White to play $$ . . . . . . . . . . . . . . | $$ . . . . . . . . . . . . . . | $$ . . . . . . . . . . . . . . | $$ . . . . . . . . . . . . . . | $$ . . . O O O . O . . . . . . | $$ . . . O X X O . . . . . . . | $$ . O O X . . X O O O O . . . | $$ . O X . X . X O X . . O O . | $$ . O X . . . . X . X X X O . | $$ ----------------------------+[/go]

Tenuki because I cannot find anything

Click Here To Show Diagram Code: [go]$$W White to play $$ +---------------------------------------+ $$ | . . . X 5 . 1 2 X 4 . . . . . . . . . | $$ | . . X O O O 3 X O X . X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O . X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

Click Here To Show Diagram Code: [go]$$W White to play $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . 7 O . . . . . . $$ | . X O X . . . . . $$ | . 4 X O O . . . . $$ | 3 X X X O . . . . $$ | X O X X O . . . . $$ | 1 O X O O . . . . $$ | O . O X . O . . . $$ | 5 O O X X X . . . $$ | 2 X X O X O . X . $$ | . . 6 O X . . . . $$ | . . . . . . . . . $$ +------------------[/go]

Click Here To Show Diagram Code: [go]$$W White to play $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | 7 5 O . . . . . . $$ | 6 X O X . . . . . $$ | 3 4 X O O . . . . $$ | 2 X X X O . . . . $$ | X O X X O . . . . $$ | 1 O X O O . . . . $$ | O . O X . O . . . $$ | . O O X X X . . . $$ | . X X O X O . X . $$ | . . . O X . . . . $$ | . . . . . . . . . $$ +------------------[/go]

EDIT: Hmm there may be another variation for black creating ko (unless I am totally out of tune

)

Click Here To Show Diagram Code: [go]$$W White to play $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . O . . . . . . $$ | . X O X . . . . . $$ | 6 4 X O O . . . . $$ | 3 X X X O . . . . $$ | X O X X O . . . . $$ | 1 O X O O . . . . $$ | O . O X . O . . . $$ | 5 O O X X X . . . $$ | 2 X X O X O . X . $$ | . . 7 O X . . . . $$ | . . . . . . . . . $$ +------------------[/go]

HermanHiddema · Post by **HermanHiddema** » Tue Sep 27, 2011 8:33 am

@daniel_the_smith:

@entropi:

entropi · Post by **entropi** » Tue Sep 27, 2011 8:43 am

jts · Post by **jts** » Tue Sep 27, 2011 8:51 am

HermanHiddema · Post by **HermanHiddema** » Tue Sep 27, 2011 9:10 am

@entropi:

@jts:

Magicwand · Post by **Magicwand** » Tue Sep 27, 2011 10:23 am

edit:

HermanHiddema · Post by **HermanHiddema** » Tue Sep 27, 2011 10:52 am

@Magicwand:

Yes, basically correct, but black should only give one stone, of course, and take sente:

Click Here To Show Diagram Code: [go]$$W is sente $$ +---------------------------------------+ $$ | . . . X . . 1 3 X 2 . . . . . . . . . | $$ | . . X O O O . X O X . X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O . X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

So white should throw in first, as it is free and may give better endgame later:

Click Here To Show Diagram Code: [go]$$W White can play a at any time to create aji. $$ +---------------------------------------+ $$ | . . . X . . 3 . X 1 2 . a . . . . . . | $$ | . . X O O O . X O X . X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O . X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

The following resistance is pointless and loses sente:

Click Here To Show Diagram Code: [go]$$W at , at $$ +---------------------------------------+ $$ | . . . X . 9 2 . X 1 3 6 . . . . . . . | $$ | . . X O O O 5 X O X 4 X O X X O . . . | $$ | . X . X O . O O O X . X X O O O . . . | $$ | . . . X O . O X O O 0 X O . . , . . . | $$ | . . . X O O X X X O O X O . . . . . . | $$ | . . . X . X . . . X X O O . . . . . . | $$ | . . . . . . X . . . . . . . . . . . . |[/go]

jts · Post by **jts** » Tue Sep 27, 2011 11:12 am

Magicwand · Post by **Magicwand** » Tue Sep 27, 2011 11:22 am

jts wrote:
As I've mentioned before I tend to fixate on insignificant details. A question for Herman (or anyone else, really) on question 2: I'm wondering whether one should use the first moves in that sequence as ko threats. Would you ignore the situation for as long as possible in the hope that your opponent has missed the sequence and might miss the opportunity to defend, or would you use the beginning of that sequence as medium-sized ko threats long before finishing the sequence became profitable?

HermanHiddema · Post by **HermanHiddema** » Tue Sep 27, 2011 11:23 am

jts wrote:
As I've mentioned before I tend to fixate on insignificant details. A question for Herman (or anyone else, really) on question 2: I'm wondering whether one should use the first moves in that sequence as ko threats. Would you ignore the situation for as long as possible in the hope that your opponent has missed the sequence and might miss the opportunity to defend, or would you use the beginning of that sequence as medium-sized ko threats long before finishing the sequence became profitable?

jts · Post by **jts** » Tue Sep 27, 2011 11:43 am

Life In 19x19

Some situations from recent games

Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games

Re: Some situations from recent games