Dieter's ABC of mistakes - 14

Talk about improving your game, resources you like, games you played, etc.
Post Reply
User avatar
Knotwilg
Oza
Posts: 2432
Joined: Fri Jan 14, 2011 6:53 am
Rank: KGS 2d OGS 1d Fox 4d
GD Posts: 0
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
Location: Ghent, Belgium
Has thanked: 360 times
Been thanked: 1021 times
Contact:
Contact Knotwilg

Dieter's ABC of mistakes - 14

Post by Knotwilg »

Click Here To Show Diagram Code
[go]$$B Mistake 14
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . O . . |
$$ | . . O , . . . . . , . . O . b O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X c . |
$$ | . . . O . . . . . X . . . X . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X . 1 a . . . . . . . . . . . |
$$ | . . X O X . O . X . . . . . . . . . . |
$$ | . . O X X O . . . . X . . . . . . . . |
$$ | . . O X . . . O . O . . X X X X X X . |
$$ | . . O X . . X O . . . O O X O O O O . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
''a'' [cut], ''b'' [connect], ''c'' [sabaki]
Top
phillip1882
Lives in gote
Posts: 323
Joined: Sat Jan 08, 2011 7:31 am
Rank: 6k
GD Posts: 25
OGS: phillip1882
Has thanked: 4 times
Been thanked: 39 times

Re: Dieter's ABC of mistakes - 14

Post by phillip1882 »

its a tossup between 'a' and 'b' for me. i would probably play 'a' but i tend to be too aggressive. 'c' doesn't look promising.
Top
User avatar
Harleqin
Lives in sente
Posts: 921
Joined: Sat Mar 06, 2010 10:31 am
Rank: German 2 dan
GD Posts: 0
Has thanked: 401 times
Been thanked: 164 times

Re: Dieter's ABC of mistakes - 14

Post by Harleqin »

If 'a' works, then I think it should be played to keep up the pressure (ha!). Even if it doesn't completely »work«, it might be worthwhile to play it as a probe.

It is unclear if defending at 'b' is absolutely urgent, but Black certainly has various options to exploit the thinness here.

Black has no sente plays around 'c'. White might want to play at 'c' before defending at 'b' though, but one would have to look deeply what options Black really has to answer there. Leaving 'a' aside, 'c' would again stress the opponent.

So, 'a' for me right now.
A good system naturally covers all corner cases without further effort.
Top
User avatar
jlt
Gosei
Posts: 1786
Joined: Wed Dec 14, 2016 3:59 am
GD Posts: 0
Has thanked: 185 times
Been thanked: 495 times

Re: Dieter's ABC of mistakes - 14

Post by jlt »

Let's figure out the continuation of the cut.

First instinct: cut and extend. This doesn't work.
Click Here To Show Diagram Code
[go]$$Bc Oops
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . O . . |
$$ | . . O , . . . . . , . . O . b O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X c . |
$$ | . . . O . . . . . X . . . X . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . 4 . . . . . . . . . . . |
$$ | . . O O X . 1 2 . . . . . . . . . . . |
$$ | . . X O X . O 3 X . . . . . . . . . . |
$$ | . . O X X O 5 . . . X . . . . . . . . |
$$ | . . O X . . . O . O . . X X X X X X . |
$$ | . . O X . . X O . . . O O X O O O O . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Second attempt: cut and atari. Black can still connect by ko. Black takes first.
Click Here To Show Diagram Code
[go]$$Bc ko
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . O . . |
$$ | . . O , . . . . . , . . O . b O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X c . |
$$ | . . . O . . . . . X . . . X . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . 4 . . . . . . . . . . . . |
$$ | . . O O X 6 1 2 . . . . . . . . . . . |
$$ | . . X O X 7 O 3 X . . . . . . . . . . |
$$ | . . O X X O 5 8 . . X . . . . . . . . |
$$ | . . O X . . . O . O . . X X X X X X . |
$$ | . . O X . . X O . . . O O X O O O O . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Third attempt: the other atari.
Click Here To Show Diagram Code
[go]$$Bc Oops
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . O . . |
$$ | . . O , . . . . . , . . O . b O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X c . |
$$ | . . . O . . . . . X . . . X . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . 6 5 . . . . . . . . . . . . |
$$ | . . O O X 4 1 2 . . . . . . . . . . . |
$$ | . . X O X . O 3 X . . . . . . . . . . |
$$ | . . O X X O . . . . X . . . . . . . . |
$$ | . . O X . . . O . O . . X X X X X X . |
$$ | . . O X . . X O . . . O O X O O O O . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
I can't read the continuation. Black's corner stones seem in difficulty, however White has also helped Black to convert his moyo into territory.

On the other hand, if White doesn't play in the upper right corner, what can Black do? The following variation reduces White to a dead L-group, so White can't play like this:
Click Here To Show Diagram Code
[go]$$Bc L group
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . 7 . . . . |
$$ | . . . . O . . . . . . . 9 5 4 8 O . . |
$$ | . . O , . . . . . , . 0 O 6 3 O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]
So probably White must let Black cut his group; White won't have comfortable life in the corner.
Click Here To Show Diagram Code
[go]$$Bc cut
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . 7 6 . . . . |
$$ | . . . . O . . . . . . . . 5 4 . O 8 . |
$$ | . . O , . . . . . , . . O . 3 O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]
Let's try "c". No idea what is the best sequence so I'll try something random.
Click Here To Show Diagram Code
[go]$$Bc Oops
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . . . . . . . . . . . O . . |
$$ | . . O , . . . . . , . . O . b O . X . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . X . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . 7 5 . |
$$ | . . . . . . . . . . . . . . . 6 X 2 . |
$$ | . . . O . . . . . X . . . X . X O 3 . |
$$ | . . . . . . . . . . . . . . . . 4 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X . 1 . . . . . . . . . . . . |
$$ | . . X O X . O . X . . . . . . . . . . |
$$ | . . O X X O . . . . X . . . . . . . . |
$$ | . . O X . . . O . O . . X X X X X X . |
$$ | . . O X . . X O . . . O O X O O O O . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Hmm... Can that live? The wall at R4 is pretty scary.

So I'd choose between "a" and "b". Hard to decide. Maybe "b" first. If Black doesn't protect then White can play "a" later, otherwise White can reduce Black's moyo instead.
Top
Post Reply

Return to “Amateurs”