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 Post subject: Dieter's ABC of mistakes - 11
Post #1 Posted: Tue Apr 13, 2021 8:26 am 
Gosei
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Click Here To Show Diagram Code
[go]$$Bc Mistake 11
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X X . . . . . . . . . . . . |
$$ | . . X X O O O X . . . . . O . . . . . |
$$ | . . O O b . . . . , . . . . . O . . . |
$$ | . . . . . c . . . . . . . X . . O . . |
$$ | . . O . . . . . . . . . . . . X X . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . . X . . . O . X O . O X . . . . . |
$$ | . O O X . X O . . X . O X X . X X . . |
$$ | . . X , X X X O . , . O O . . X O . . |
$$ | . a X X O . O X X X . . . O . O O . . |
$$ | . . O O . O O O O X . . X O . O . . . |
$$ | . . . . O . X X . X . X X X X X O . . |
$$ | . . O O . . O X . X . . O . . . O . . |
$$ | . . X . . X O O O O . X O . . . . . . |
$$ | . . . X . . . . . X . . O X X X X X . |
$$ | . . . . . X . O . . . . O X O O O X . |
$$ | . . . . . . . . . . . O . O . . . O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Things are hot in the upper left. Should Black keep White disconnected at ''a'', cut to capture at ''b'' or play the vital point of ''c''?

Black's choice lost 2,5 points but shifted the balance to White again and was the start of lots of trouble.

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 Post subject: Re: Dieter's ABC of mistakes - 11
Post #2 Posted: Tue Apr 13, 2021 10:05 am 
Lives in sente
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Black is not alive, D10 is a false eye, and if White can somehow manage to pull out the marked stones, then White separates two weak black groups, which may cause trouble.

If Black b, then White may think about sacrificing F17.

The situation is hard to read but "c" seems a good choice, which defends D13 and at the same time aims at "b" or at swallowing the marked white stones.

So I vote for "c".

Click Here To Show Diagram Code
[go]$$Bc Mistake 11
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X X . . . . . . . . . . . . |
$$ | . . X X O O O X . . . . . O . . . . . |
$$ | . . O O b . . . . , . . . . . O . . . |
$$ | . . . . . c . . . . . . . X . . O . . |
$$ | . . O . . . . . . . . . . . . X X . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . . X . . . W . X O . O X . . . . . |
$$ | . O O X . X W . . X . O X X . X X . . |
$$ | . . X , X X X W . , . O O . . X O . . |
$$ | . a X X O . O X X X . . . O . O O . . |
$$ | . . O O . O O O O X . . X O . O . . . |
$$ | . . . . O . X X . X . X X X X X O . . |
$$ | . . O O . . O X . X . . O . . . O . . |
$$ | . . X . . X O O O O . X O . . . . . . |
$$ | . . . X . . . . . X . . O X X X X X . |
$$ | . . . . . X . O . . . . O X O O O X . |
$$ | . . . . . . . . . . . O . O . . . O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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 Post subject: Re: Dieter's ABC of mistakes - 11
Post #3 Posted: Thu Apr 15, 2021 11:01 am 
Lives in gote

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Click Here To Show Diagram Code
[go]$$Bc Mistake 11
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X X . . . . . . . . . . . . |
$$ | . . X X O O O X . . . . . O . . . . . |
$$ | . . O O b . . . . , . . . . . O . . . |
$$ | . . . . . c . . . . . . . X . . O . . |
$$ | . . O . . . . . . . . . . . . X X . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . . X . . . O . X O . O X . . . . . |
$$ | . O O X . X O . . X . O X X . X X . . |
$$ | . . X , X X X O . , . O O . . X O . . |
$$ | . a X X O . O X X X . . . O . O O . . |
$$ | . . O O . O O O O X . . X O . O . . . |
$$ | . . . . O . X X . X . X X X X X O . . |
$$ | . . O O . . O X . X . . O . . . O . . |
$$ | . . X . . X O O O O . X O . . . . . . |
$$ | . . . X . . . . . X . . O X X X X X . |
$$ | . . . . . X . O . . . . O X O O O X . |
$$ | . . . . . . . . . . . O . O . . . O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Surely this must be 'c'? Definitely not 'b'...white will give up the stones. 'a' at least looks at the white stones below, but Black's corner isn't that strong and I'm afraid of losing sente.

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 Post subject: Re: Dieter's ABC of mistakes - 11
Post #4 Posted: Sat Apr 17, 2021 3:52 am 
Lives in sente
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I'd play 'c' with an eye on attacking the white three stones around H10. Later, I'd want to play B5 to secure the corner while aiming at F6.

'b' looks dangerous, as White might sacrifice either the two or the three stones and then seriously attack the black group.

'a' look dangerous, as the white groups it disconnects do not seem very weak (F6/F9 is countered by E4), and since 'a' does nothing else (no eyes, no connection), White can then attack the black group.

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