Life In 19x19

Posted: **Fri Jun 16, 2017 10:53 pm**

I got a promotion off this game, but it was filled with so much mistakes, I feel. Some tips on local fighting techniques would be greatly appreciated.

Posted: **Sat Jun 17, 2017 12:56 am**

Hi negapesuo,

-

This exchange may be too good for W.
For

, maybe 3-3 or tenuki... possible.
( Even when

is at F3, AG seemed to play

rarely. )

E8 also big.

Seems strange.

Seems better to play here directly, without the

-

exchange.

C16.

If

at C16, then you can resist at E15.

Why. Why is this stone important ? What is it doing globally ?

This hane-block-atari helps W's eye shape.
If you jump to K18, W has to be careful ( B E18 ).

M15. There's also a peep at M18.

N14.

N12.

M12. Compare your board here to if you had M15 at

.

R17.

Why are you following W ? S13.

(

&

... Compare to

at P12 directly. )

3-3.

101 Already in trouble from earlier mistakes. S19 ( Locally, B still dead shape ).

106 S18.

107 S18.

180 S18.

Posted: **Sat Jun 17, 2017 2:48 pm**

Thanks Ed

The thing that I definitely have a hard time around is evaluating whether an exchange is beneficial at the moment. The concept is very foreign to me, and I don't know how people know that ahead of time.

EdLee wrote:Hi negapesuo,

- This exchange may be too good for W.
For , maybe 3-3 or tenuki... possible.
( Even when is at F3, AG seemed to play rarely. )

E8 also big.

Seems strange.

Seems better to play here directly, without the - exchange.

C16.

If at C16, then you can resist at E15.

Why. Why is this stone important ? What is it doing globally ?

This hane-block-atari helps W's eye shape.
If you jump to K18, W has to be careful ( B E18 ).

M15. There's also a peep at M18.

N14.

N12.

M12. Compare your board here to if you had M15 at .

R17.

Why are you following W ? S13.

( & ... Compare to at P12 directly. )

3-3.

101 Already in trouble from earlier mistakes. S19 ( Locally, B still dead shape ).

106 S18.

107 S18.

180 S18.

Posted: **Sat Jun 17, 2017 6:30 pm**

Hi negapesuo,

The thing that I definitely have a hard time around is evaluating whether an exchange is beneficial at the moment. The concept is very foreign to me, and I don't know how people know that ahead of time.

Very good question; also, very common.
Example of a local exchange:

( Ignore any life-and-death issues;
we just look at this local sequence for now. )

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

Let's rewind. First, B makes the exchange of

and

:

Click Here To Show Diagram Code: [go]$$B var 1.1 $$ ? , . . . . . , . . O . . , . . . | $$ ? X X X X X X X O O . O O O O O O | $$ ? . . . . . . . 1 2 . . . . . . . | $$ ? . . . . . . . . . . . . . . . . | $$ -----------------------------------[/go]

Then, B makes the exchange of

and

:

Click Here To Show Diagram Code: [go]$$B var 1.2 $$ ? , . . . . . , . . O . . , . . . | $$ ? X X X X X X X O O . O O O O O O | $$ ? . . . . . . . X O . . . . . . . | $$ ? . . . . . . . 3 4 . . . . . . . | $$ -----------------------------------[/go]

Finally, B fixes the cut with

:

Click Here To Show Diagram Code: [go]$$B var 1.3 $$ ? , . . . . . , . . O . . , . . . | $$ ? X X X X X X X O O . O O O O O O | $$ ? . . . . . . 5 X O . . . . . . . | $$ ? . . . . . . . X O . . . . . . . | $$ -----------------------------------[/go]

Since

and

go together, we can say B makes the exchange of (

+

) with

.

What do you think of this exchange: (

+

) with

?

For comparison, here's a slightly different local sequence.
The first part is the same as var 1.1 --
B exchanges

with

:

Click Here To Show Diagram Code: [go]$$B var 2.1 ( same as 1.1 ) $$ ? . . . . . . , . . O . . , . . . | $$ ? X X X X X X X O O . O O O O O O | $$ ? . . . . . . . 1 2 . . . . . . . | $$ ? . . . . . . . . . . . . . . . . | $$ -----------------------------------[/go]

The next part is different.
Instead of dropping to the first line as in var 1.2,
this time B just connects:

Click Here To Show Diagram Code: [go]$$B var 2.2 $$ ? . . . . . . , . . O . . , . . . | $$ ? X X X X X X X O O . O O O O O O | $$ ? . . . . . . 3 1 2 . . . . . . . | $$ ? . . . . . . . . . . . . . . . . | $$ -----------------------------------[/go]

Survey:

Have you experienced a similar local situation in your own games, as Black ( at var 1.1 ) ?
Which local reply did you choose ? 1st line drop (var 1.2) or connect (var 2.2) ?
Var 1 and var 2.2: how are they different (could be more than one aspect) ?

Life In 19x19

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