Life In 19x19

Posted: **Wed Feb 23, 2011 2:02 pm**

One of my little darlin's

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

No komi.

Enjoy!

Posted: **Wed Feb 23, 2011 2:38 pm**

Posted: **Wed Feb 23, 2011 2:40 pm**

Posted: **Wed Feb 23, 2011 2:45 pm**

so simple but tricky.

Posted: **Wed Feb 23, 2011 2:51 pm**

Magicwand wrote:so simple but tricky.
$$Wc White to play and win
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | . O X 3 X O O |
$$ | O X X 4 X . 5 |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | . 6 . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | . O X 3 X O O | $$ | O X X 4 X . 5 | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . 6 . . . . . | $$ ---------------[/go]

$$Wc White to play and win
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | 9 O X 3 X O O |
$$ | O X X 6 X 5 4 |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | . 7 8 . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 9 O X 3 X O O | $$ | O X X 6 X 5 4 | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . 7 8 . . . . | $$ ---------------[/go]

That's how I like 'em.

Posted: **Wed Feb 23, 2011 2:52 pm**

Posted: **Wed Feb 23, 2011 2:56 pm**

jts wrote:
$$Wc Variation 1a
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | . O X 5 X O O |
$$ | O X X 6 X 3 4 |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | . 8 . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc Variation 1a $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | . O X 5 X O O | $$ | O X X 6 X 3 4 | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . 8 . . . . . | $$ ---------------[/go]
retakes, fills, -1

$$Wc Variation 1b
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | 9 O X 5 X O O |
$$ | O X X 0 X 3 4 |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | . 7 8 . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc Variation 1b $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 9 O X 5 X O O | $$ | O X X 0 X 3 4 | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . 7 8 . . . . | $$ ---------------[/go]
fills, fills, -1

$$Wc Variation 2a
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | . O X 5 X O O |
$$ | O X X . X 2 3 |
$$ | O X . X . X 1 |
$$ | O X X . X X 4 |
$$ | . 6 . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc Variation 2a $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | . O X 5 X O O | $$ | O X X . X 2 3 | $$ | O X . X . X 1 | $$ | O X X . X X 4 | $$ | . 6 . . . . . | $$ ---------------[/go]
-1

$$Wc Variation 2b
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | 7 O X 4 X O O |
$$ | O X X . X 2 3 |
$$ | O X . X . X 1 |
$$ | O X X . X X 5 |
$$ | . 8 . . . 6 . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc Variation 2b $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 7 O X 4 X O O | $$ | O X X . X 2 3 | $$ | O X . X . X 1 | $$ | O X X . X X 5 | $$ | . 8 . . . 6 . | $$ ---------------[/go]
-2

Posted: **Wed Feb 23, 2011 2:59 pm**

Chew Terr wrote:
$$Wc White to play and win
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | 9 O X 3 X O O |
$$ | O X X 7 X 5 4 |
$$ | O X . X 8 X 1 |
$$ | O X X . X X 2 |
$$ | . 6 . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 9 O X 3 X O O | $$ | O X X 7 X 5 4 | $$ | O X . X 8 X 1 | $$ | O X X . X X 2 | $$ | . 6 . . . . . | $$ ---------------[/go]
10 at 1
Unless I'm wrong, this is 9-8, white's favor.

Posted: **Wed Feb 23, 2011 3:02 pm**

Jordus wrote:
$$Wc White to play and win
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | 9 O X 7 X O O |
$$ | O X X . X . 3 |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | 4 5 6 . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 9 O X 7 X O O | $$ | O X X . X . 3 | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | 4 5 6 . . . . | $$ ---------------[/go]
@ and @

1 captured each. White wins by 2...

*edit*... doesn't work if black plays at first.... in that case a ko at would be more in whites favor... but I am not sure black would play into the ko....

*edit*
I take that back... at first leaves white winning plus 1?

Posted: **Wed Feb 23, 2011 3:03 pm**

Bill Spight wrote:
Chew Terr wrote:
$$Wc White to play and win
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | 9 O X 3 X O O |
$$ | O X X 7 X 5 4 |
$$ | O X . X 8 X 1 |
$$ | O X X . X X 2 |
$$ | . 6 . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 9 O X 3 X O O | $$ | O X X 7 X 5 4 | $$ | O X . X 8 X 1 | $$ | O X X . X X 2 | $$ | . 6 . . . . . | $$ ---------------[/go]
10 at 1
Unless I'm wrong, this is 9-8, white's favor.

$$Wc White to play and win
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | . O X 3 X O O |
$$ | O X X 6 X 5 4 |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | . . . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | . O X 3 X O O | $$ | O X X 6 X 5 4 | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . . . . . . . | $$ ---------------[/go]

Posted: **Wed Feb 23, 2011 3:27 pm**

Bill Spight wrote:
$$Wc
$$ ---------------
$$ | . . . . . . . |
$$ | . O O O O O . |
$$ | . O X 4 X O O |
$$ | O X X . X 3 . |
$$ | O X . X . X 1 |
$$ | O X X . X X 2 |
$$ | . . . . . . . |
$$ ---------------
Click Here To Show Diagram Code
[go]$$Wc $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | . O X 4 X O O | $$ | O X X . X 3 . | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . . . . . . . | $$ ---------------[/go]

Posted: **Wed Feb 23, 2011 5:33 pm**

Posted: **Thu Feb 24, 2011 8:10 am**

Simple and tricky, as MagicWand says.

Tricky because few people have seen the key combination, which gains, ahem, 7/12 of a point.

Congratulations to the solvers.

Click Here To Show Diagram Code: [go]$$Wc White to play and win $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | . O X 3 X O O | $$ | O X X . X . . | $$ | O X . X . X 1 | $$ | O X X . X X 2 | $$ | . . . . . . . | $$ ---------------[/go]

Usually

is part of a combination with a connection along the edge that gains 1/2 pt. Here it is part of a combination with

, which gains 7/12 of a point. White wins by 1 pt. The rest is miai.

Click Here To Show Diagram Code: [go]$$Wc Stubborn resistance $$ --------------- $$ | . . . . . . . | $$ | . O O O O O . | $$ | 9 O X O X O O | $$ | O X X 6 X 5 4 | $$ | O X . X . X W | $$ | O X X . X X X | $$ | . 7 8 . . . . | $$ ---------------[/go]

offers the most stubborn resistance by capturing a stone. The point of the exercise is that

forces

, so that the combination,

-

, gains only 1/3 pt. Now the combination,

-

, gains 1/3 pt. for White. The players share the two open kos. White still wins by 1 pt.

The original position has an overall count of -5/12 (from Black's point of view). After

-

the count is -1, for a White win.

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

fills the ko.

The right and center look like a miai pair, each of which gains 1/2 pt. However, they interact because of the threat against the

stones in the previous diagram. If White makes the mistake of playing them as miai (

-

), he loses 1/12 pt., for a count of -1/3. Then each of

-

gains 1/3 pt., so that the count remains -1/3.

Now White has no ko threat, but must fill a dame with

. (Note that

was necessary to prevent

from becoming a ko threat.) Then

fills the ko to gain 1/3 pt. for jigo.

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

gains 7/12, for a count of 1/6. Now the combination,

-

, gains 1/2, for a count of -1/3. Finally,

gains 1/3, for jigo.

Posted: **Thu Feb 24, 2011 12:34 pm**

W+1, late to the parade, I know.

Posted: **Thu Feb 24, 2011 2:04 pm**

Life In 19x19

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