Life In 19x19

Posted: **Thu Apr 01, 2021 8:15 am**

Click Here To Show Diagram Code: [go]$$W Mistake 5 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . X O . X . . . . . . . . . X X X X . | $$ | . X O X . b c . . . . . X X O X . . X | $$ | . X O X . O X . . , . O X O O O X X . | $$ | . O X X X O X . . X X O O X O X O O . | $$ | O . O O O O . . . X O O . . O X O . . | $$ | . O . . . . . X X O X O . . O X O . . | $$ | . . . . X O O X O O . . X . . X . . . | $$ | . a . . X . X O . . . . . O X X X O . | $$ | . X X , . . X O . O . . . O O X O . . | $$ | . O X . . . X O . O X . . . . O O . . | $$ | O . O X . . X X . X O . . . . . . . . | $$ | . O O . . . . . . X O . . . . . . . . | $$ | . . . . . . . . . X O . O . . . . . . | $$ | . . . O . . X . O O X O . . . . . . . | $$ | . . O , . . . . . , X X O O O O O O . | $$ | . . O X . . X . . . . X X O X X X X . | $$ | . X X . . . . . . . . . . X . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

White's left side group needs to pay attention to its eyespaces. Should it play ''a'', ''b'' or ''c''? White's choice lost another 9 points here.

Posted: **Fri Apr 02, 2021 4:16 am**

A will hurt group on left. B wont gain much needed eye. C is using opponent's weakness to gain eye space in sente.

Posted: **Fri Apr 02, 2021 8:58 am**

As far as I can see, there is no move on the left that will both secure a second eye and not make A10 or A11 sente. We should look very hard at the top.

The point about 'c' is that Black cannot cut at 'b'. But what happens then?

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

I don't think that Black could play

at

, as then the centre group doesn't look healthy:

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

Is this the right

? What other resistance might Black try?

Posted: **Fri Apr 02, 2021 9:16 am**

At least what I missed is this tesuji

Life In 19x19

Dieter's ABC of mistakes - 5

Dieter's ABC of mistakes - 5

Re: Dieter's ABC of mistakes - 5

Re: Dieter's ABC of mistakes - 5

Re: Dieter's ABC of mistakes - 5