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1k vs 3d
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Author:  VincentCB [ Mon Feb 10, 2014 5:39 pm ]
Post subject:  1k vs 3d
I played an even game against a 3d, in which I lost by 15 points. I'd like to have some advice, since I seem to have more and more trouble telling good moves from bad ones :scratch:. I put some comments/questions in the SGF.

Thanks!
Author:  Bill Spight [ Mon Feb 10, 2014 10:39 pm ]
Post subject:  Re: 1k vs 3d
Well done! :)

Some comments on the opening.
Author:  VincentCB [ Tue Feb 11, 2014 5:53 am ]
Post subject:  Re: 1k vs 3d
Thanks a lot Bill! During the game, I did consider most of the moves you suggested, but I rejected them for various (unclear...) reasons. For :b37: in particular, I just can't figure out why I thought pushing through would be bad :blackeye: !
Author:  EdLee [ Tue Feb 11, 2014 6:19 am ]
Post subject: 
VincentCB wrote:
For :b37: in particular, I just can't figure out why I thought pushing through would be bad :blackeye: !
Probably had something to do with your sense of broken shapes...
Author:  ez4u [ Tue Feb 11, 2014 7:55 am ]
Post subject:  Re: 1k vs 3d
I think you should have pushed through with 35 instead of 37. The problem with 35 in the game was that White had both M3 and M5 on the board so Black will get cut no matter what happens. If White had played 36 at 38, what would Black have done?

Black 1 below was natural. However, :w2: looks like an overplay because :b3: helps Black a lot. White has to push through at 4 to make any sense out of 2. As long as Black goes ahead with 5, White gets to go back and connect with 6. Now what will Black do? Black 7 at 8 would revert to the game with a rather uncomfortable situation for Black. The exchange of 7 for 8, however, leaves Black with two groups of weak stones and a tough fight ahead.
Click Here To Show Diagram Code
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$$ | . . . . . . . . . . O . . . . X O . . |
$$ | . . . X . . . . O . . . . O . X O . . |
$$ | . . . . . . . 1 3 X 8 O . . . X O . . |
$$ | . . . X . . O 6 2 4 5 . . . X , O . . |
$$ | . . . . . . . . . X 7 O . O X X . O . |
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If Black seizes the opportunity to push through with 5 below, White is forced to answer. Black can drive all way down to 9. White has to end with 10 or something nearby to fix the potential Black play at 10.

Click Here To Show Diagram Code
[go]$$Bc
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$$ | . . . X . . . . O . . . . O . X O . . |
$$ | . . . . . . . 1 3 X . O . . . X O . . |
$$ | . . . X . . O 5 2 4 0 . . . X , O . . |
$$ | . . . . . . . 7 6 X . O . O X X . O . |
$$ | . . . . . . . 9 8 . . . . . . . . . . |
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It seems to me that White has to simply push through with :w2: below. Black still gets the chance to put White on the spot with 7 however. White probably cuts with 8. Black probably should just connect because taking the White stone and allowing White to cut at 9 and live in that area looks difficult. Again White will have to fix things up here and end in gote. I think Black is happy to just push up at 'a'. Alternatively 'b' to prevent an attack on the lower right stones might be attractive.
Click Here To Show Diagram Code
[go]$$Bc
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$$ | . . . O . . . . X . . . . . . . . . . |
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$$ | . . . , . . . . . , . . . . . b . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . X . X . . . |
$$ | . . . . . . . . . . O . . . . X O . . |
$$ | . . . X . . . a O . . . . O . X O . . |
$$ | . . . . . . . 1 2 X . O . . . X O . . |
$$ | . . . X . . O 3 4 . . . . . X , O . . |
$$ | . . . . . . . 5 6 X . O . O X X . O . |
$$ | . . . . . . . 9 7 8 0 . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  Bill Spight [ Tue Feb 11, 2014 8:18 am ]
Post subject:  Re: 1k vs 3d
ez4u wrote:
I think you should have pushed through with 35


Right. :)

My bad. :oops:
Author:  VincentCB [ Tue Feb 11, 2014 10:17 am ]
Post subject:  Re: 1k vs 3d
ez4u wrote:
I think you should have pushed through with 35
Your explanation makes a lot of sense. Thanks!
Author:  ez4u [ Tue Feb 11, 2014 4:06 pm ]
Post subject:  Re: 1k vs 3d
Another point around here is 41. I think this is a wasted play. Before deciding on a move like this Black should have played the atari at :b1: below. If White answers at :w2: and play continues through :w6:, will Black play :b7: next? Effectively, this is what happened in the game. Yet after :b3:, :b7: and 'a' are miai for connected all the Black stones. In addition, White can not play 'a' in sente because of the atari against :w2:. So White can only try playing 7 in exchange for a Black play at 'a'. What would such a play accomplish for White? Very little, since the Black stones will in any case be connected and surrounding any center White stones.

This is an important general point to learn. Until the fate of the marked White stone is settled, nearby plays like 41 run the risk of ending up redundant. We need to keep track of the decisive stones.
Click Here To Show Diagram Code
[go]$$Bc First things first
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$$ | . . . . . . . . . . O . 7 . . X O . . |
$$ | . . . X . . 4 . O . O X . O . X O . . |
$$ | . . . . . 6 5 X X X X W 3 a . X O . . |
$$ | . . . X . . O O O O X 1 2 . X , O . . |
$$ | . . . . . . . . . X O O . O X X . O . |
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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