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Tough trollnament opponent #1/2
http://www.lifein19x19.com/viewtopic.php?f=4&t=1574		 Page 1 of 1
Author:  balmung [ Sun Sep 05, 2010 11:22 am ]
Post subject:  Tough trollnament opponent #1/2
Can you please review this game so I can understand my mistakes in fighting better. Also in the upper left my moves were not accurate which hurt alot.
Author:  Joaz Banbeck [ Sun Sep 05, 2010 11:44 am ]
Post subject:  Re: Tough trollnament opponent #1/2
On move 14 you played this:

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


That is not too good. Let's do tewari analysis:

You are presumably concerned about the weak spot at D16. That is a very reasonable concern. If black takes it, you have cutting points at 'a' and 'b'.

Click Here To Show Diagram Code
[go]$$Bc
$$ -----------------
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . a O X . . . .
$$ | . . O C X . . . .
$$ | . . b O . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


So you play D16 yourself.

But suppose the position were this:

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


...would you then play this?

Click Here To Show Diagram Code
[go]$$Wc
$$ -----------------
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . O X . . . .
$$ | . . 1 O X . . . .
$$ | . . . O . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


Of course not - it is a really ugly, inefficient shape. If you are not willing to arrive at that position via one sequence, you should also be unwilling to be in that position via any sequence.

So, the next best course of action is to see if there is a way of dealing with the potential cutting points in a more efficient manner. Look at nearby points to see if you can come up with something better.

This covers it easily:

Click Here To Show Diagram Code
[go]$$Wc
$$ -----------------
$$ | . . . . . . . . .
$$ | . . . 1 . . . . .
$$ | . . a O X . . . .
$$ | . . O . X . . . .
$$ | . . . O . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


And if black tries to force it, he gets nowhere:

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


...which continues like this, if he is really persistent

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



Try looking at the patterns of your stones. See if they work together. In your mind, change the order of moves that gets to that particular formation, and see if it makes sense. See http://senseis.xmp.net/?Tewari
Author:  balmung [ Sun Sep 05, 2010 11:52 am ]
Post subject:  Re: Tough trollnament opponent #1/2
the move in the upper left was pure instinct I felt like an idiot because g17 looks a whole lot better
Author:  Joaz Banbeck [ Sun Sep 05, 2010 12:02 pm ]
Post subject:  Re: Tough trollnament opponent #1/2
If white does not bother to finish the joseki in the lower left, then E3 is the classic shape-wrecking move. In this instance, black did very well, killing your entire corner.

The usual way of dealing with this as white is to play F3 or occasionally E4 before black has a chance to play E3. See http://senseis.xmp.net/?34PointHighAppr ... ideContact
Author:  Joaz Banbeck [ Sun Sep 05, 2010 12:10 pm ]
Post subject:  Re: Tough trollnament opponent #1/2
balmung wrote:
the move in the upper left was pure instinct I felt like an idiot because g17 looks a whole lot better


Maybe better than D16. But not best. If you really must pincer, H17 is probably safer. It still prevents a comfortable eastward extension from his two stones.

But better than either G17 or H17 is to make yourself strong first, then attack.
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