Go Problem & Pro Game Journal

logan · Post by **logan** » Mon Nov 12, 2012 4:14 am

Dear Readers,

My main purpose of making this journal is for others. I'm already involved in regular go problem and pro game study, and haven't ever been for the lack of motivation to study these areas.

A playing partner of mine recently spoke about studying tsumego books until he earned a certain percentage or higher and then moved on. I hadn't thought about this study method in a long-while, so though it was nothing new it seemed fresh again to this aging mind. Soon after, I put together an ordered list of primarily life & death (L&D) books to go through using this method. I've gone through all of the books before, so the list isn't ambitious to me, rather it's more about rigor. Before going any further here's the book & problem list:

My goal is 95% or greater. If I fail, then I'll repeat the section until I pass. Nothing complicated here

Since I would be doing this activity regardless of a journal, then my purpose of the journal is to share any interesting problems I may find along the way. The reason for their interest may be wide & varied, so please expect the problems I choose to be as such.

As for professional games, I'll just be posting any I find interesting.

Finally, my motivation for study won't ever be an issue, but my time for posting is. So some weeks I may post more problems than others, and games may sometimes be accompanied with personal notes or none at all. Also, I've learned to feel comfortable taking a break whenever it feels correct. The break may be a few days or a few months, whichever I need to be able to return in good health.

Thank-you for taking the time to read, and I hope we may share in some interesting problems & games.

-logan

logan · Post by **logan** » Mon Nov 12, 2012 4:40 pm

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

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

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

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

SoDesuNe · Post by **SoDesuNe** » Tue Nov 13, 2012 9:21 am

Ha ha ha, yes, these corner patterns always throw me off-guard. The right move changes with every stone added or substracted...

Click Here To Show Diagram Code: [go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | O O . . . . . . . . . $$ | O X O O . . . . . , . $$ | . X X X O O . . . . . $$ | . 1 . X X O . O . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | O O . . . . . . . . . $$ | . X O O . . . . . , . $$ | . X X X O O . . . . . $$ | . . . X X O . O . . . $$ | . 1 . . O . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O . O . . . . . . . $$ | X O . . . O . . . . . $$ | O X O O . . . . . , . $$ | . X X X O . . . . . . $$ | . . . X O . . . . . . $$ | . 1 . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O . O . . . , . $$ | . X X X O . . . . . . $$ | . 1 . X X O O . . . . $$ | . . . . O X . . . . . $$ ----------------------[/go]

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

Seki, I hope ^^

oren · Post by **oren** » Tue Nov 13, 2012 10:19 am

Where are the problems from?

logan · Post by **logan** » Tue Nov 13, 2012 4:37 pm

SoDesuNe wrote:Ha ha ha, yes, these corner patterns always throw me off-guard. The right move changes with every stone added or substracted...

$$B Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | O O . . . . . . . . .
$$ | O X O O . . . . . , .
$$ | . X X X O O . . . . .
$$ | . 1 . X X O . O . . .
$$ | . . . . . . . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | O O . . . . . . . . . $$ | O X O O . . . . . , . $$ | . X X X O O . . . . . $$ | . 1 . X X O . O . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

$$B Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | O O . . . . . . . . .
$$ | . X O O . . . . . , .
$$ | . X X X O O . . . . .
$$ | . . . X X O . O . . .
$$ | . 1 . . O . . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | O O . . . . . . . . . $$ | . X O O . . . . . , . $$ | . X X X O O . . . . . $$ | . . . X X O . O . . . $$ | . 1 . . O . . . . . . $$ ----------------------[/go]

$$B Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O . O . . . . . . .
$$ | X O . . . O . . . . .
$$ | O X O O . . . . . , .
$$ | . X X X O . . . . . .
$$ | . . . X O . . . . . .
$$ | . 1 . . . . . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O . O . . . . . . . $$ | X O . . . O . . . . . $$ | O X O O . . . . . , . $$ | . X X X O . . . . . . $$ | . . . X O . . . . . . $$ | . 1 . . . . . . . . . $$ ----------------------[/go]

$$B Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . O O O . O . . . , .
$$ | . X X X O . . . . . .
$$ | . 1 . X X O O . . . .
$$ | . . . . O X . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O . O . . . , . $$ | . X X X O . . . . . . $$ | . 1 . X X O O . . . . $$ | . . . . O X . . . . . $$ ----------------------[/go]

$$W Bonus White to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . O . . . . . . . .
$$ | O O . . . . . . . . .
$$ | 4 X O O . . . . . , .
$$ | . X X X O O . . . . .
$$ | 5 2 . X X O . O . . .
$$ | . 1 3 . 6 . . . . . .
$$ ----------------------

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

Seki, I hope ^^

Hehe right! The answers flip-flop

Answer to the bonus problem:

oren wrote:Where are the problems from?

Thank-you for the question oren.

They're from the first item on the list: Essential Life & Death Vol. 2. After I finish that book then they'll be from the next item on the list, and so forth.

logan · Post by **logan** » Wed Nov 14, 2012 4:00 pm

How to gain seki in sente? A or B?

Click Here To Show Diagram Code: [go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | X X X X X . . . . , . $$ | O O O O O X . . . . . $$ | . . a . O X . . . . . $$ | . b . . O X . . . . . $$ ----------------------[/go]

The book says this is seki. Is it correct?

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

Book solution:

SoDesuNe · Post by **SoDesuNe** » Thu Nov 15, 2012 3:14 am

logan wrote:How to gain seki in sente? A or B?
$$B Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . X . . . .
$$ | X X X X X . . . . , .
$$ | O O O O O X . . . . .
$$ | . . a . O X . . . . .
$$ | . b . . O X . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | X X X X X . . . . , . $$ | O O O O O X . . . . . $$ | . . a . O X . . . . . $$ | . b . . O X . . . . . $$ ----------------------[/go]

logan wrote:The book says this is seki. Is it correct?
$$B Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . O . . . .
$$ | O O O O O . . . . , .
$$ | X X X X X O . . . . .
$$ | . . . . X O . . . . .
$$ | . . O . X O . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . O . . . . $$ | O O O O O . . . . , . $$ | X X X X X O . . . . . $$ | . . . . X O . . . . . $$ | . . O . X O . . . . . $$ ----------------------[/go]

logan · Post by **logan** » Sat Nov 17, 2012 2:41 am

At how early had Black been planning the attack on the lower White group?

logan · Post by **logan** » Thu Nov 22, 2012 11:06 pm

I'll be posting from book 2 now (Essential L&D Vol. 3). There was something else I was going to post from #1, but I can't remember anymore! :lol:

Might as well post one of my favorite problems from #2. It's a way of killing I've only got to actually play once or twice...But when it happens -- woo-wee!

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

logan · Post by **logan** » Fri Nov 23, 2012 5:41 pm

This shape is one of the more varied to learn.

Click Here To Show Diagram Code: [go]$$B 1. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | . X O O O X X . X . . $$ | X O . . . O . . . . . $$ | . O . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 2. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | . . . O O O . . . , . $$ | . O O X X X O O . O . $$ | . O X . . . X O . . . $$ | . . X . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 3. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . X X X . . . , . $$ | . X X O O O X X . X . $$ | . X O . . . O . . . . $$ | . . O . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 4. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . X a X . . . , . $$ | . X X O O O X X . X . $$ | . X O . . . O . . . . $$ | . . O . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 5. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . X a X . . . , . $$ | . X X O O O X X Y . X $$ | . X O . . . O . . . . $$ | . . O . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 6. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | O X . . . X O . . . . $$ | . . . . . X . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 7. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | . X . . . X O . . . . $$ | . . . O . X . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 8. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | . X O O O X X . . . . $$ | . O . . . O X . . . . $$ | . . . . . O . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 9. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | Q X O O O X X . . . . $$ | . O . . . O X . . . . $$ | . . . . . O . . . . . $$ ----------------------[/go]

SoDesuNe · Post by **SoDesuNe** » Sat Nov 24, 2012 4:13 am

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

I would like this but sooo many variations.

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . . . . . . $$ | . . . . X . . . . . . $$ | . 5 X . . . . . . . . $$ | a O X , X . . . . , . $$ | . 2 O O X . X . . . . $$ | 6 1 . 4 . . . . . . . $$ | . 7 . b 3 . . . . . . $$ ----------------------[/go]

'a' and 'b' are Miai.

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

Ko.

Click Here To Show Diagram Code: [go]$$Bc 1b Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | . X O O O X X . X . . $$ | X O . 2 . O . . . . . $$ | . O a 1 b . . . . . . $$ ----------------------[/go]

does not work. 'a' and 'b' (the killing move in later problems) are Miai because Black can't atari at A1.

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

White lives.

Click Here To Show Diagram Code: [go]$$Bc 2. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | . . . O O O . . . , . $$ | . O O X X X O O . O . $$ | . O X . a . X O . . . $$ | . . X . b . 1 . . . . $$ ----------------------[/go]

Symmetrical position: 'a' and 'b' are Miai because Black has enogh liberties at B1 and H1.

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

White needs to take a liberty from the two black stones, otherwise Black throws-in at D2 ('a') and then plays B1: White can't connect. But taking a liberty from the two black stones makes a dead eye-shape due to the cutting points at 'a' and 'b'.

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

does not work for White here. 'a' and 'b' are Miai for Black.

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

That kills. See problem 3a.

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

White can start a Ko like that?

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

That's a Ko, too.

Click Here To Show Diagram Code: [go]$$Bc 5. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . X a X . . . , . $$ | . X X O O O X X Y . X $$ | . X O . . . O . . . . $$ | . . O . . . . . . . . $$ ----------------------[/go]

I don't see a difference to problem 4 : (

Click Here To Show Diagram Code: [go]$$Bc 6. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | O X . b . X O . . . . $$ | . 1 . a . X . . . . . $$ ----------------------[/go]

'a' and 'b' are Miai again.

Click Here To Show Diagram Code: [go]$$Bc 7a Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | 4 X 5 1 . X O . . . . $$ | . 2 . O 3 X . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bc 7b Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | a X 5 1 7 X O . . . . $$ | . 3 2 W 6 X 4 . . . . $$ ----------------------[/go]

'a' and marked stone are Miai for life.

Click Here To Show Diagram Code: [go]$$Bc 8a Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | . X O O O X X . . . . $$ | 3 O . . . O X . . . . $$ | . 1 2 . . O . . . . . $$ ----------------------[/go]

Ko.

Click Here To Show Diagram Code: [go]$$Bc 8a Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | . X O O O X X . . . . $$ | 2 O 3 4 . O X . . . . $$ | . 1 . 5 . O . . . . . $$ ----------------------[/go]

Ko.

Click Here To Show Diagram Code: [go]$$Bc 9a Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | Q X O O O X X . . . . $$ | . O . . . O X . . . . $$ | . . . . . O . . . . . $$ ----------------------[/go]

So far, no clue... : (

I think I got heavily confused in the end ^^

logan · Post by **logan** » Sun Nov 25, 2012 4:15 pm

SoDesuNe wrote:
$$Bc Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . X . . . . . .
$$ | . . X . . . . . . . .
$$ | . O X , X . . . . , .
$$ | . 2 O O X . X . . . .
$$ | . 1 . . . . . . . . .
$$ | . . . . 3 . . . . . .
$$ ----------------------

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

I would like this but sooo many variations.

$$Bc Black to play
$$ | . . . . . . . . . . .
$$ | . . . , . . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X . . . . . . . .
$$ | . . . . X . . . . . .
$$ | . 5 X . . . . . . . .
$$ | a O X , X . . . . , .
$$ | . 2 O O X . X . . . .
$$ | 6 1 . 4 . . . . . . .
$$ | . 7 . b 3 . . . . . .
$$ ----------------------

Click Here To Show Diagram Code
[go]$$Bc Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . . . . . . $$ | . . . . X . . . . . . $$ | . 5 X . . . . . . . . $$ | a O X , X . . . . , . $$ | . 2 O O X . X . . . . $$ | 6 1 . 4 . . . . . . . $$ | . 7 . b 3 . . . . . . $$ ----------------------[/go]

'a' and 'b' are Miai.

Good job : )

I think it works best when :b3:

is a double attack (threatening to connect out the placement stone and attack another group).

SoDesuNe wrote: think I got heavily confused in the end ^^

Yes, systematic study like this can sometimes jumble my brain too. But from experience I know it's the most rewarding. We shouldn't master these the first, or even second time through; so it's why strong players suggest going over problem sets many times.

Answers:

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

Click Here To Show Diagram Code: [go]$$B 2. A/B Miai $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | . . . O O O . . . , . $$ | . O O X X X O O . O . $$ | . O X . b . X O . . . $$ | . . X . a . 1 . . . . $$ ----------------------[/go]

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

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

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

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

Click Here To Show Diagram Code: [go]$$Bm11 5. Cont. 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . X a X . . . , . $$ | . X X O O O X X Y . X $$ | . X O O X X O O O X . $$ | . . O 4 X Q 1 X O . . $$ ----------------------[/go]

@

,

@

,

@

Click Here To Show Diagram Code: [go]$$Bm12 5. End Position $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . X a X . . . , . $$ | . X X O O O X X Y . X $$ | . X O O X X O O O X . $$ | . . O O X X X . O . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 6. A/B Miai $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | O X . b . X O . . . . $$ | . 1 . a . X . . . . . $$ ----------------------[/go]

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

Click Here To Show Diagram Code: [go]$$B 7. A/B Miai $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O O O O . . . . , . $$ | . O X X X O O . . . . $$ | a X 3 1 . X O . . . . $$ | . 5 2 O b X 4 . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 8. Ko (Best for White) $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | . X O O O X X . . . . $$ | 2 O 7 4 6 O X . . . . $$ | . 1 8 3 . O 5 . . . . $$ ----------------------[/go]

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

Click Here To Show Diagram Code: [go]$$B 9. Ko (Best for White) $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | Q X O O O X X . . . . $$ | 3 O 2 . . O X . . . . $$ | 4 1 . . . O . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 9. Ko $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | Q X O O O X X . . . . $$ | . O 5 4 . O X . . . . $$ | . 1 2 3 . O . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 9. Dead $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | Q X O O O X X . . . . $$ | . O 4 . 5 O X . . . . $$ | . 1 2 3 . O . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 9. Dead $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X X X X . . . . , . $$ | Q X O O O X X . . . . $$ | . O . . 5 O X . . . . $$ | 4 1 2 3 . O . . . . . $$ ----------------------[/go]

New Problems:

Click Here To Show Diagram Code: [go]$$B 1. Black to Play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . O . . . . . . $$ | . O O O . . . . . , . $$ | . X X X O O . . . . . $$ | . . . . X O . O . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 2. Black to Play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . X . . . . . . $$ | . X X X . . . . . , . $$ | . O O O X X . . . . . $$ | . . . . O X . X . . . $$ | . . . O . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 3. Black to Play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O . . O . . . . . . $$ | Y O . O . . . . . , . $$ | . X X X O O . . . . . $$ | . . . . X O . O . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 4. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | . . . . O . . . . . . $$ | . . . X . . . . . , . $$ | . . . . . O . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

logan · Post by **logan** » Sat Dec 01, 2012 10:58 pm

Answers:

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

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

Click Here To Show Diagram Code: [go]$$B 3. Alive $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . O . . O . . . . . . $$ | Y O . O . . . . . , . $$ | 2 X X X O O . . . . . $$ | . 3 . . X O . O . . . $$ | . . . 1 . . . . . . . $$ ----------------------[/go]

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

Click Here To Show Diagram Code: [go]$$B 4. Most common solution by professionals $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O 0 . . . . . . . $$ | . . . 9 O . . . . . . $$ | . 2 4 X . . . . . , . $$ | . 3 1 7 6 O . . . . . $$ | . . . . 5 8 . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm11 4. Cont. 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . 2 . . . . . . . . . $$ | . . O O . . . . . . . $$ | . . . X O . . . . . . $$ | 1 O O X . . . . . , . $$ | . X X X O O . . . . . $$ | . . . . X O . . . . . $$ | . . . 3 . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$B 4. Miai A/B $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | . b . . O . . . . . . $$ | . 2 . X . . . . . , . $$ | . 3 1 . . O . . . . . $$ | . . 5 4 a . . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Was going through a new book this week, 실전에 자주 나타나는 사활 by Yoo Chang-hyuk. Basically it's about frequently appearing L&D shapes. Since Yoo Chang-hyuk helped supervise the Essential L&D series and the series also has a focus on practical L&D, then there's a lot of overlap. They can form a good pair, studying the series then Yoo's book (since the latter is condensed).

Inspired by problem from Essential L&D 2 & Yoo's book -- a normal invasion begins...

Click Here To Show Diagram Code: [go]$$B Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . 8 . . . . . . . . $$ | . 6 . . . . . . . . . $$ | . 5 2 O . O . . . , . $$ | . 7 1 . . . . . . . . $$ | . . . 3 . 4 . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Question: Does Black owe another move?

logan · Post by **logan** » Wed Dec 05, 2012 1:14 am

Answer:

Black can tenuki because White's shape is too weak to withstand Black's resistance. Let's see what happens when White tries to kill...

Click Here To Show Diagram Code: [go]$$Wm1 Solution 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | 0 O . . . . . . . . . $$ | 1 X O O . O . . . , . $$ | 5 X X . . . . . . . . $$ | 6 2 . X 8 O . . . . . $$ | . 4 3 7 9 . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Wm11 Cont. 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | X O . . . 7 . . . . . $$ | 1 X O O . O 6 8 . , . $$ | . X X . 4 2 3 . 0 . . $$ | X X . X X O 5 . 9 . . $$ | . X O O O . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Wm21 Cont. 2, @ $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . . . . . . $$ | X O . . . O . . . . . $$ | O X O O . O X X . 8 . $$ | . X X . X X O . X 7 9 $$ | X X 4 X X O O 1 O 6 0 $$ | . X O O O 2 3 . . . . $$ ----------------------[/go]

White will not be able to kill.

If White this way...

Click Here To Show Diagram Code: [go]$$Wm21 Solution 2, @ $$ | . . . . . . . . . . . . . $$ | . . . , . . . . . , . . . $$ | . . . . . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O . . . . . . . . . . $$ | X O . . . O . . . . . . . $$ | O X O O . O X X . , . . . $$ | . X X . X X O . X . . . . $$ | X X . X X O O 2 O 1 . . . $$ | . X O O O . . . . . . . . $$ ----------------------[/go]

It's a practical shape to remember, because invasion with the below shape is a common position:

Click Here To Show Diagram Code: [go]$$Bm1 Common shape $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . O . O . . . , . $$ | . . 1 . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Therefore, White play this is more common:

Click Here To Show Diagram Code: [go]$$Wm1 Common shape $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . a . . . . . . . . . $$ | b 9 . . . . . . . . . $$ | . 8 1 O . O . . . , . $$ | 0 3 X 5 . . . . . . . $$ | . 4 6 2 7 . . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Sealing Black is good & straight forward; but there is some bad aji around A and better endgame potential B for Black.

So if there is stone in marked area (A), or if White can get stone there as part of whole-board strategy, then playing the first way can be better, because White shape is stronger and still end in sente. In such as case, :b9:

is way to finish living.

Click Here To Show Diagram Code: [go]$$Bm1 When to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . 8 . . . . . . . . $$ | . 6 . . . . . . . . . $$ | . 5 2 O . O . . . , . $$ | . 7 1 . . . . . . a . $$ | . . . 3 9 4 . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 1. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . O . . . . $$ | . . . . O . . . . . . $$ | . O O , . . O . . , . $$ | . . X . X X O . . . . $$ | X . . X O O . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 2. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . . X . . . . . . $$ | . X X , . . X . . , . $$ | . . O . O O X . . . . $$ | O . . O X X . . . . . $$ | . O . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 3. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . . . . . . $$ | . X . . . . . . . . . $$ | . O X X . . . . . , . $$ | . O O O X X X . . . . $$ | . . . . O O X . . . . $$ | . . . . . . X . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 4. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X . . . . . . . . . $$ | . . X . X . . . . . . $$ | . X . . . . . . . . . $$ | O O O O . . O . . , . $$ | . X X O . . . . . O . $$ | . X O . . . . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Is book solution correct?

Does

work?

Click Here To Show Diagram Code: [go]$$Bm1 5. $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | X X X X X . . . . , . $$ | 1 O O O O X . . . . . $$ | 2 . . . O X . . . . . $$ | . 3 . . . . . . . . . $$ ----------------------[/go]

logan · Post by **logan** » Wed Dec 26, 2012 7:19 pm

Answers:

Click Here To Show Diagram Code: [go]$$Bm1 1. Solution 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . O . . . . $$ | . . . . O . . . . . . $$ | . O O , . . O . . , . $$ | . 4 X . X X O . . . . $$ | X 5 . X O O 2 . . . . $$ | . 3 . . 1 . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 2. Solution 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . . X . . . . . . $$ | . X X , . . X . . , . $$ | . 1 O . O O X . . . . $$ | O 2 . O X X . . . . . $$ | . O 4 3 . 5 . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 2. Solution 2 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . X . . . . $$ | . . . . X . . . . . . $$ | . X X 7 . . X . . , . $$ | . 1 O . O O X . . . . $$ | O 3 8 O X X 4 5 . . . $$ | . O 9 . 2 6 . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 3. Solution 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . . . . . . $$ | . X . . . . . . . . . $$ | 6 O X X . . . . . , . $$ | . O O O X X X . . . . $$ | 7 . 2 1 O O X . . . . $$ | . 3 . 4 . 5 X . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 3. Failure 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X . . . . . . . . $$ | . X . . . . . . . . . $$ | . O X X . . . . . , . $$ | . O O O X X X . . . . $$ | . 2 . 3 O O X . . . . $$ | . 1 4 . . . X . . . . $$ ----------------------[/go]

The book solution is correct. In this problem, White's shape is not strong enough to capture Black.

Click Here To Show Diagram Code: [go]$$Bm1 4. Solution 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X . . . . . . . . . $$ | . . X . X . . . . . . $$ | . X . . . . . . . . . $$ | O O O O . 8 O . . , . $$ | 4 X X O . 7 9 0 . O . $$ | 2 X O 1 5 . 6 . . . . $$ | . 3 . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm11 4. Cont. 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X . . . . . . . . . $$ | . . X . X . . . . . . $$ | . X . . . . . . . . . $$ | O O O O . O O . . , . $$ | O X X O . X X O . O . $$ | O X O X X 1 O 2 . . . $$ | . X . . . . . . . . . $$ ----------------------[/go]

However, if White's shape is strong enough, then a ko is possible:

Click Here To Show Diagram Code: [go]$$Bm1 4. Solution 2 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X . . . . . . . . . $$ | . . X . X . . . . . . $$ | . X . . . . . . . . . $$ | O O O O . . O . . , . $$ | . X X O . Q . . . O . $$ | 2 X O 1 . . . . . . . $$ | . 4 3 . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 4. Solution 3 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . X . . . . . . . . . $$ | . . X . X . . . . . . $$ | . X . . . . . . . . . $$ | O O O O . . O . . , . $$ | 4 X X O . Q . . . O . $$ | 2 X O 1 5 6 . . . . . $$ | . 3 7 . 8 . . . . . . $$ ----------------------[/go]

Sometimes, Black can play this way, and White will be captured by a shortage of liberties:

Click Here To Show Diagram Code: [go]$$Bm1 5. Sometimes works. $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | X X X X X . . . . , . $$ | 1 O O O O X . . . . . $$ | 2 7 4 . O X . . . . . $$ | . 3 . 6 5 . . . . . . $$ ----------------------[/go]

However, because of Black's outside cutting point at A, :b3:

does not work here:

Click Here To Show Diagram Code: [go]$$Wm8 5. White will push towards a second eye. $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | X X X X X a . . . , . $$ | X O O O O X 4 . 6 . . $$ | O X O . O X 3 5 7 . . $$ | 2 X . O X 1 . . . . . $$ ----------------------[/go]

Therefore, this second method is correct:

Click Here To Show Diagram Code: [go]$$Bm1 5. Solution 1 $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | X X X X X . . . . , . $$ | 3 O O O O X . . . . . $$ | 4 5 7 . O X . . . . . $$ | . 6 . 1 2 . . . . . . $$ ----------------------[/go]

Problems from Essential L&D Vol. 4 now.

Click Here To Show Diagram Code: [go]$$Bm1 1. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . X X . . . . . , . $$ | . . O O X X X . . . . $$ | . . . . O O X . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 2. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . O . . . O . . . . $$ | . O . O . O . . . , . $$ | . . O X X X O O O O . $$ | . . . O . . X X X O . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 3. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . X . . . . . $$ | . X X X . . . . . . . $$ | . X O O X . . . . , . $$ | . O . O X . X . . . . $$ | . . . O O X . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 4. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . O . . . . $$ | . O O O O . . . . . . $$ | . O X X a . . . . , . $$ | . X . X O O . . . . . $$ | O . . X X O . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

Click Here To Show Diagram Code: [go]$$Bm1 5. Black to play $$ | . . . . . . . . . . . $$ | . . . , . . . . . , . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . . . . . . $$ | . . . . . . X . . . . $$ | . X X X X . . . . . . $$ | . X O O a . . . . , . $$ | . O . O b X . . . . . $$ | . . . O O X . . . . . $$ | . . . . . . . . . . . $$ ----------------------[/go]

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