OCA's log

EdLee · Post by **EdLee** » Fri Mar 27, 2015 1:51 am

Hi oca,

Locally B can push out with

at J16 -- broken shape for you.

B has the option to connect under at H18.

standard bad habit, bad sente. Learn not to do this.

another standard bad habit. Locally, just connect.

,

this person is full of bad habits. He just killed his own connection at H18, in gote even. Spectacular.

read the life-and-death if you extend to D10.

B can just connect at A7.

terrible. Classic broken shape.

and

are all wrong. Fix your shape directly with

at K3, for example.

oca · Post by **oca** » Sun Mar 29, 2015 6:18 am

A new try a double hane, but I'm affraid that was a bit too much this time...

Click Here To Show Diagram Code: [go]$$Wcm62 $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . O X X X . . . . . . . . . . . . O . | $$ | . . O O X . X O O . . . O . . . O X . | $$ | . . . O X . X X . O . . . . . O . X . | $$ | . . . . O O X . . . . . . . . . . . . | $$ | . . O . . . 1 2 . . . . . . X . X . . | $$ | . . . . . . . 3 . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . O , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . X . X X X . | $$ | . X . . . . . . . . . . . . . . O O . | $$ | . . X X . . . . . . . . . O . O . . . | $$ | . . O , . . . O . , . . . O . O . X . | $$ | . . . X X O O . . O . X . X X X O O . | $$ | . . . . . X X O . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

Whole game

Uberdude · Post by **Uberdude** » Sun Mar 29, 2015 9:02 am

The problem was c17, making d17 become an empty triangle which is bad for liberties. You can block at c18. You might think c18 has more problems (leaving a cutting point), but if black cuts you can atari from c16 and then b18 (it does leave a clamp for the yose though). If play on the outside then proceeded as in the game, your double hane wouldn't have had the problem it did in the game (d15 would still be an atari, but one you answer at c15 and black's cutting stone there would only have one liberty rather than the 2 in the game, so your 2 stones would not be capturable).

oca · Post by **oca** » Sun Mar 29, 2015 9:41 am

oh... C18 is working... thanks for your comments Uberdude !

Uberdude · Post by **Uberdude** » Sun Mar 29, 2015 9:46 am

And if c18 wasn't working, jumping would be a better shape: (of course 58 can also think about tenuki, but you can see how b17 is now in a better place than c17 in terms of all those cuts)

Click Here To Show Diagram Code: [go]$$Wcm56 $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . 3 2 X X . . . . . . . . . . . . O . | $$ | . 1 . O X . X O O . . . O . . . O X . | $$ | . . . O . . X X . O . . . . . O . X . | $$ | . . . . . O . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . X . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . O , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . X . X X X . | $$ | . X . . . . . . . . . . . . . . O O . | $$ | . . X X . . . . . . . . . O . O . . . | $$ | . . O , . . . O . , . . . O . O . X . | $$ | . . . X X O O . . O . X . X X X O O . | $$ | . . . . . X X O . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

oca · Post by **oca** » Tue Mar 31, 2015 9:32 am

Here I wanted to try something different, not a super fancy opening, just something that I dont play often, a double 5-3 opening...

I also tried a very light sequence (18 to 30)... well that emded to be quite weird game, that I won on time but I was that in good shape at the end I think

...

Any comments welcome.

oca · Post by **oca** » Tue Mar 31, 2015 9:41 am

I just saw that 'a' would have been a nice end game move for me.

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

if black decide to defend at 'b', 'c' would then be nice ...

rat4000 · Post by **rat4000** » Tue Mar 31, 2015 11:37 am

On the newest game:

is asking for trouble. The two stones are weak, but both the stone you just played and your O3 stones are also weak.

What do you do after

@ N5? (I don't think I know the right answer -- it's just something you might want to look at.)

From

to

, K5 was the biggest move on the board. White left too many cuts behind. (Black can also consider L6, but I think that's worse.)

I think both

and

should be P11. Did you have an answer for that if your opponent played it for

?

If you want to live in the top left S15 for

102 seems necessary. (I'm not completely sure that it lives but I think it does.) As the game went,

107 @ S14 kills (as far as I can see), and after that you're behind by a lot considering that K17 etc. aren't alive yet.

Generally I feel neither of you paid enough attention to the weak white groups that appeared through the game.

Finally, one specific variation starting with

, to explain why I said K5 was bigger than playing in the top left:

Click Here To Show Diagram Code: [go]$$Bcm39 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . O X . . . . . . . . . . . . . . . | $$ | . . O , . X . . . , . . . . . , X . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . O . . O . . . | $$ | . . . . 3 . . . . . 1 O . . X O . . . | $$ | . . O . . . 2 . O X C X O X X X O . . | $$ | . . . , X . . a . O X X X O . X O . . | $$ | . . . O X . . O . . X X . O X . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

In this diagram, I'd much rather be black. In the game, I'd much rather be white, but that's your opponent's fault. (My

might be better than the game move -- lighter -- but I can't give a variation to say why I prefer it. Black can play

after white a, too.)

EdLee · Post by **EdLee** » Wed Apr 01, 2015 11:23 am

oca wrote:I also tried a very light sequence (18 to 30)...

Hi oca,

Good you're experimenting and trying things.

But that's not light -- that's just losing a lot of points.

Knotwilg · Post by **Knotwilg** » Wed Apr 01, 2015 3:15 pm

Knotwilg's laws of gamesmanship:
1. Don't resign
2. Don't lose on time
Further comments left to the community.

oca · Post by **oca** » Thu Apr 02, 2015 11:20 am

rat4000 wrote:On the newest game:
...
From to , K5 was the biggest move on the board. White left too many cuts behind. (Black can also consider L6, but I think that's worse.)
...

Hi rat4000, thanks a lot for all your comments.
about that K5, I missed that one, and I was sure that I had to play L6 to protect both cut... that's why I played

at D15, which was a ladder breaker if I had the opportunity to play at 'a' later (so that the cut at b would not work anymore...)

but K5 seems to protect both cut, so that was really the move...

Click Here To Show Diagram Code: [go]$$Wcm32 $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , X . . | $$ | . . . 1 . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . b O . . O . . . | $$ | . . . . . . . . . . a O . . X O . . . | $$ | . . O . . . . . . . O X O X X X O . . | $$ | . . . , X . . . . O X X X O . X O . . | $$ | . . . O X . . O . . X X . O X . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

oca · Post by **oca** » Thu Apr 02, 2015 11:33 am

Here are two other games, one was very fine, and the other... to complexe...

what is funny is that in both games, my opponent played that

which is not so good...(:b31: in the won game and

in the lost game ). However, in the lost game, this mistake was not enougth for me to win.

Click Here To Show Diagram Code: [go]$$W $$ | . . . . . . . . . $$ | . . 6 . . . . . . $$ | . . 5 X . . . . . $$ | . . 3 4 . 1 . 2 . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ +------------------[/go]

The fine one :

The lost one : (maybe the sequence 39, 41 and 34 was not a good idea...)

EdLee · Post by **EdLee** » Thu Apr 02, 2015 12:32 pm

Hi oca,

Game 1:

B18. It has to do with the statuses of both his F17 group
and your D16 group -- each is not settled. B18 is a huge shared vital point.
L17 direction is not urgent because if B wants to play there,
you welcome the fight -- he will have two unsettled groups.

Did you read E16, E17 push, G18 peep, A17 hane --
is Black alive after this sequence ?
( If you had taken B18 hane yourself, would Black be alive after this E16 sequence ? )

How about just connect with C12.

did you consider B12.

D9. What happened to the fight ?

oca wrote:this mistake was not enougth for me to win.

Important lesson. Later, you'll find that even around 1k levels,
this variation does not decide the game -- far from it.
Think of

as a variation, and study its infinite local sequences.
It's a mistake to think that

decides the game.

Before this, you missed the F12 vital point.

N17.

did you read B's push and cut M14 ?

EdLee · Post by **EdLee** » Thu Apr 02, 2015 1:14 pm

Hi oca,

Game 2:

,

this combo feels soft to me. Like in game 1 upper left corner,
W jumps in and you let him settle too nicely. No bite.

Interesting, but W is very strong there now,
thanks to the local

variation.
How about E11 -- continue your moyo plan.
Or, jump into lower left corner somewhere.

heavy. ( Perhaps even greedy and unreasonable, overplay ? )

I almost want to say nonsense. If you reply locally, why not just block H17 ?!

C17.

misread ?

M6.

104

106

108

127

129 Exercise: what happens if B cuts at D14 now ?

mitsun · Post by **mitsun** » Thu Apr 02, 2015 2:31 pm

oca wrote:I just saw that 'a' would have been a nice end game move for me.

$$Bc
$$ +---------------------------------------+
$$ | . . . . . . . . . a . b . . . . . . . |
$$ | . . X . . . c Y Y O . . . . . . . . . |
$$ | . . O X . . . O Y O X X . X . . . . . |
$$ | . . O , . X X X O , O O X . X , X . . |
$$ | . . . O . . . O O . . O X X O O . . . |
$$ | . . . . . X . . . . O X . . X O . . . |
Click Here To Show Diagram Code
[go]$$Bc $$ +---------------------------------------+ $$ | . . . . . . . . . a . b . . . . . . . | $$ | . . X . . . c Y Y O . . . . . . . . . | $$ | . . O X . . . O Y O X X . X . . . . . | $$ | . . O , . X X X O , O O X . X , X . . | $$ | . . . O . . . O O . . O X X O O . . . | $$ | . . . . . X . . . . O X . . X O . . . |[/go]
if black decide to defend at 'b', 'c' would then be nice ...

Nice observation! This is a high-level endgame tesuji, which you will find in yose books. The stylish sequence is to start with 'c', playing 'a' only at the end when it is atari.

Life In 19x19

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