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Offline emeraldemon
 Post subject: tsumego from my game
Post #1 Posted: Tue Jul 08, 2014 8:16 am 
Gosei
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Just a nice little problem that came up in my game yesterday. What is the status of the white group?

Click Here To Show Diagram Code
[go]$$Bcm1
$$ ----------------------+
$$ . . . . . . . . . . . |
$$ . . . . . . X X . . . |
$$ . . . . . . O X O O . |
$$ . , . X X X X O . O . |
$$ . . X . O O O O . O . |
$$ . . . X . . . X O . . |
$$ . . . . X X X . X X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . X . . |
$$ . , . . . . . , . . . |
$$ . . . . . . . . . . . |[/go]
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Offline skydyr
 Post subject: Re: tsumego from my game
Post #2 Posted: Tue Jul 08, 2014 11:17 am 
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White looks alive to me because there's an eye around R16 and miai between dealing with the upper right and T15. The most confusing attack I can find is black S19, threatening ko, but white can respond with S18 and be fine.
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Offline emeraldemon
 Post subject: Re: tsumego from my game
Post #3 Posted: Tue Jul 08, 2014 4:35 pm 
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@skydyr

Yes, I think that's right. During the game I misread and thought black could get a ko. I think maybe this is the most interesting line:
Click Here To Show Diagram Code
[go]$$Bcm1
$$ ----------------------+
$$ . . . . . . . . 6 1 . |
$$ . . . . . . X X 7 2 5 |
$$ . . . . . . O X O O 8 |
$$ . , . X X X X O . O . |
$$ . . X . O O O O 4 O . |
$$ . . . X . . . X O 3 . |
$$ . . . . X X X . X X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . X . . |
$$ . , . . . . . , . . . |
$$ . . . . . . . . . . . |[/go]
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Offline Bill Spight
 Post subject: Re: tsumego from my game
Post #4 Posted: Tue Jul 08, 2014 5:39 pm 
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Click Here To Show Diagram Code
[go]$$Bcm1
$$ ----------------------+
$$ . . . . . . . . 3 4 5 |
$$ . . . . . . X X 2 1 0 |
$$ . . . . . . O X O O 6 |
$$ . , . X X X X O . O . |
$$ . . X . O O O O 8 O 9 |
$$ . . . X . . . X O 7 . |
$$ . . . . X X X . X X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . X . . |
$$ . , . . . . . , . . . |
$$ . . . . . . . . . . . |[/go]


If Black is unaware of :w2:, :w4:, :w6:, and :w10:, he might think that :b1: would kill.

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Offline Marcus
 Post subject: Re: tsumego from my game
Post #5 Posted: Wed Jul 09, 2014 1:09 pm 
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Thanks, Bill, I missed that line. :mrgreen:
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Offline paK0
 Post subject: Re: tsumego from my game
Post #6 Posted: Thu Jul 10, 2014 7:02 am 
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Bill Spight wrote:
Click Here To Show Diagram Code
[go]$$Bcm1
$$ ----------------------+
$$ . . . . . . . . 3 4 5 |
$$ . . . . . . X X 2 1 0 |
$$ . . . . . . O X O O 6 |
$$ . , . X X X X O . O . |
$$ . . X . O O O O 8 O 9 |
$$ . . . X . . . X O 7 . |
$$ . . . . X X X . X X . |
$$ . . . . . . . X . . . |
$$ . . . . . . . . X . . |
$$ . , . . . . . , . . . |
$$ . . . . . . . . . . . |[/go]


If Black is unaware of :w2:, :w4:, :w6:, and :w10:, he might think that :b1: would kill.


If one cannot see that white can live he might assume that white is dead :lol:
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Offline emeraldemon
 Post subject: Re: tsumego from my game
Post #7 Posted: Thu Jul 10, 2014 7:21 am 
Gosei
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Well in the game I played the block at R18, which was ok anyway since I was winning and it makes some points (Bill: how many points? 4 or so?), but afterwards I realized I could've played elsewhere.
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