OCA's log

oca · Post by **oca** » Sun Sep 14, 2014 8:35 am

Thanks all for your comments,

I played a new game, but despite a won by a few points, I'm not really happy with it, way too much blunders...
I failed to apply what you all just said to me...

Here is the commented game.

Any comments welcome ! [edit] even if these still apply to my playing in that game (but Rome wasn't built in one day...)

Knotwilg wrote:1. understand the function of stones: useless stones, important stones in contested area, important cutting stones, stones with some potential remaining
2. keep track of your liberties towards the end (as throughout the game)
3. stay away from strong groups

[/edit]

S2W · Post by **S2W** » Sun Sep 14, 2014 12:12 pm

Some comments on the first half - I liked the ko in the corner - not sure if it was the best move but I never would have though of it.

S2W · Post by **S2W** » Sun Sep 14, 2014 12:14 pm

oca wrote:I failed to apply what you all just said to me...

I feel like apologizing for that every time I post something.

oca · Post by **oca** » Sun Sep 14, 2014 11:35 pm

Hi S2W,

Thank for your comments, I like your 3-3 variation where you keep sente with the keima at :b9:

! I remember seeing this on backupMovies, but I totaly missed
that idea during the game, in your variation that look really great at :b11:

!

Knotwilg · Post by **Knotwilg** » Wed Sep 17, 2014 3:14 am

Here's the story of that game and also of your game in general I believe, in a Memento fashion:

1) When the Black centre group is cut off with 200, it can be killed with a simple push at H8, reducing the shape to a bulky five. This becomes progressively apparent as the stones fill up the board. When White effectively does so, she fails to play the vital point of the bulky five. Both players ignore this for about 50 moves.

2) At 155, Black fails to see the ladder that catches his big chain. White captures and completely reverses the balance of power in the centre. Before that, both missed a basic net at 134.

3) At 127, after living small in two parts of the left area, Black tries to save two very weak stones, making the capture larger. Reducing the White area from a little further is a better idea.

4) At 85, Black ignores a kothreat which unsettles the complete left side. This is clearly larger than the ko itself which was White territory to start with. See the game for another idea. Ko is an advanced topic, so don't worry too much about this for now.

5) When White starts his awkward 1st line adventure with 24, Black shouldn't even respond. White eventually gives up and all the territory AND influence is Black's. There was almost no way to go wrong here.

Lessons to be learnt:
1) do some ladder & net exercises and very basic L&D exercises.
2) play away from strong groups
3) ignore absurd moves by the opponent such as 1st line jumps in the opening

oca · Post by **oca** » Wed Sep 17, 2014 7:08 am

Thank you very much Knotwilg,

I like your variation at 85. I often underestimate ko threats... understanding ko is not easy...

Here is my story with ko (more a joke then something else but... not that far from truth)

- 8 months ago... "Weird it's like my opponenent just played two moves in a row... but what did just happend ??? magic ???"

- 6 month ago..."a ko is a rule" we cannot play a move that leads to the previous position

- 4 month ago..."a ko can be use to... do something... but what ? and how ?"

- 3 month ago "a group can live or die depending on ko... ho... that's nice theory... but that's never occurs in game...

"

- 2 month ago "oups... ko occurs in game very frequently... "if you don't like ko, don't play go"

- 1 month ago "with a ko, you can invade in very small spaces... and either live or win something... OR LOSE THEM ALL"

- today : try to eliminate the "OR LOSE THEM ALL"

oca · Post by **oca** » Thu Sep 25, 2014 11:31 am

Hi,
Here is my last game.

I won by a lot but I still did a self-review, and saw that I did a lot of overplay :cool:

...
here is the game, with comments to move 190

As always, any comments welcome.

skydyr · Post by **skydyr** » Thu Sep 25, 2014 2:17 pm

Some comments:

EDIT: At Move 36, I meant O15, the one space jump, not O16.

Knotwilg · Post by **Knotwilg** » Thu Sep 25, 2014 3:25 pm

I made comments in parallel with skydyr so you may want to see where we concur or differ --dv

oca · Post by **oca** » Fri Sep 26, 2014 3:33 am

Thank you both very much for your comments :clap:

!

So my

seems to be the first very wrong move... Now I understand that playing it at C4 would be way better !

I also saw that I there are lots of move where I should have cut black, well I used to cut a lot, maybe to even much, in other games, and I decided to play this one more carfuly,
I still need a better reding of when a cut works and when it don't... cutting and connection is a so fascinating subject...

Also when looking in pro games using http://ps.waltheri.net/
I saw that the first move that is not in any pro game is the 3-3 invasion at :b9:

(in the only game left, black played :b9:

on C3)

oca · Post by **oca** » Wed Oct 22, 2014 6:25 am

Here is a new game I played recently.
I losed the game for a few points.
I think the first wrong move is my :w10:

where I should have played the hane at Q13 before playing on the 3-3 point in the corner... anyway I had lots of pleasure playing this game.

This week-end I will participate to my first tournement. I quite existed

!

skydyr · Post by **skydyr** » Wed Oct 22, 2014 7:05 am

I don't think taking the 3-3 point as you did was a mistake. The first thing that comes to my mind as a 'don't do this!' is :w40:

and the sequence following. Connecting to :w40:

isn't big, but black is so thick there that running after it's cut is just throwing more prisoners your opponent's way. It's better to leave all that for later and play somewhere else.

At :w58:

black is giving you the ability to connect, if you attach at S5.

:w74:

is bad direction. Why invade this small extension when there are huge unplayed areas? G16, G3, and D10 all look great. If you look by move 91, despite black's broken shape, black is alive on both sides, while white has a heavy group of stones that isn't threatening anything.

Black 107 is a mistake, and very odd looking. Cutting seems like good punishment.

At White 116, though, pushing along like this is painful. White has a ton of liberties, so you can play more aggresively. G13 pops in to mind. Certainly by black 127, white's upper left is crying, though black kind of throws it away with 135. This was kind of a theme through the later middlegame and endgame... black makes terrible mistakes, and white takes advantage. You did this well enough that I don't have much to comment on regarding it.

Out of curiousity, why the reverse komi?

oca · Post by **oca** » Wed Oct 22, 2014 7:09 am

Hi skydyr,

Thx for your comments, I will check them soon, just quickly about this one :

skydyr wrote:Out of curiousity, why the reverse komi?

I even didnt noticed this :lol:

I suppose IGS calulted that as I'm "supposed" to be stronger (14k+ vs 15k? where ? means the rank is still to be confirmed... )

S2W · Post by **S2W** » Wed Oct 22, 2014 7:46 am

That's right igs gives a reverse Komi to white of 5.5 for a one stone difference - so your opponent was 15+ but the + was left out because their rank is provisional. Your rank won't be affected by the win or loss though until their final rank is determined.

ez4u · Post by **ez4u** » Wed Oct 22, 2014 8:13 am

When Black answers 188 at 189 ( :w1:

below), White can capture with :w3:

. Black has only 2 liberties to White's 3. There seems to be no hope for Black's whole group. As long as White answers 4 with 5 and avoids allowing Black to play 'a' with effect, the game is over. ;-)

Click Here To Show Diagram Code: [go]$$Wc What now for Black? $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X O O . . . . . . . O . . . . | $$ | . . O . X X O . . . . . . O X O O . . | $$ | . . O O O X O . . O O . . O X X X O . | $$ | . X X X O X X O O X X . O . O X X X . | $$ | . O O O X X . O X O X . O O X X O O . | $$ | . . . X . . . O X . X O . X . X X O . | $$ | . O . X . X . O . X O O O X . . . X . | $$ | . . O O X . . . O X X O . X O O O X . | $$ | . . X X X . X . O X . X X O . X X X . | $$ | . . . . . X O O O . . . X O . X O O . | $$ | . X . O O O X X . O . O X X X O . O . | $$ | . . 6 8 9 . O O . O . O X . O . O . . | $$ | . X O 7 X X X X X . . O X . O O O O . | $$ | . . 4 5 a O . . . . X O . X . . X X X | $$ | . . . O . O X . . X . O . X . X X O O | $$ | . . O . O X O O 1 2 . O X . . X O O . | $$ | . . . X O X X X 3 X . O . . X O O O . | $$ | . . . . O X . . . . . . . . . X X . O | $$ ---------------------------------------[/go]

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