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Guess the next move
http://www.lifein19x19.com/viewtopic.php?f=10&t=8984		 Page 1 of 1
Author:  macelee [ Wed Aug 28, 2013 2:41 am ]
Post subject:  Guess the next move
From a professional game. Please guess black's next move.

Click Here To Show Diagram Code
[go]$$Wc
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . O . . . . . |
$$ | . . O , . . . . . O . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . 1 . . |
$$ | . . . , . . . . . , . . . . . X O . . |
$$ | . . . . . . . . . . . . . . X . X O . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . O . O . . |
$$ | . . . . . . . . . . . . . X X . . . . |
$$ | . . O . . . . . . . . . . . . O . . . |
$$ | . . . , . . . . . X . . . X . , O . . |
$$ | . . . O . . . . . . . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Hint: S8 creates a big ko. Black needs two big ko threats to win it (white has a local threat).
Author:  logan [ Wed Aug 28, 2013 2:55 am ]
Post subject:  Re: Guess the next move
my guess is k17 then force a crosscut (assuming Black wants to force the ko fight so brutely)
Author:  Kirby [ Wed Aug 28, 2013 7:40 am ]
Post subject:  Re: Guess the next move
C4. If w plays d4, black starts ko at s8. Then as ko threat, b5 to live in corner. Depending on w answer, play again in bottom left corner to threaten life.
Author:  Kirby [ Wed Aug 28, 2013 7:44 am ]
Post subject:  Re: Guess the next move
Thank you for this type of post. It's good to have posts with content about actual go positions.

Posts about breathing, hours of study time, etc., are interesting, but more subject to bickering and less educational.
Author:  macelee [ Thu Aug 29, 2013 2:28 am ]
Post subject:  Re: Guess the next move
This game is clearly about creating ko threats before starting a ko fight. Note that white needs to create at least two big threats because black has a local threat. logan has given the correct move.

Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . 1 2 4 . O . . . . . |
$$ | . . O , . . . . 0 O 3 . . . . X . . . |
$$ | . . . . . . . . . 9 . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . , . . . . . , . . . . . X O 7 . |
$$ | . . . . . . . . . . . . . . X 8 X O . |
$$ | . . . . . . . . . . . . . . . X 6 5 . |
$$ | . . . . . . . . . . . . . . O . O . . |
$$ | . . . . . . . . . . . . . X X . . . . |
$$ | . . O . . . . . . . . . . . . O . . . |
$$ | . . . , . . . . . X . . . X . , O . . |
$$ | . . . O . . . . . . . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Click Here To Show Diagram Code
[go]$$Bcm11 :w14: @ :ws: :w16: @ :b11:
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . 7 X O O . O . . . . . |
$$ | . . O , . . . 5 O O X . . . . X . . . |
$$ | . . . . . . . . . X . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . , . . . . . , . . . . . X O X 3 |
$$ | . . . . . . . . . . . . . . X @ 1 O 2 |
$$ | . . . . . . . . . . . . . . . X O X . |
$$ | . . . . . . . . . . . . . . O . O . . |
$$ | . . . . . . . . . . . . . X X . . . . |
$$ | . . O . . . . . . . . . . . . O . . . |
$$ | . . . , . . . . . X . . . X . , O . . |
$$ | . . . O . . . . . . . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


As seen, black lost many points by starting and not winning the ko, but got good compensation by killing the two stones in ladder.

Kirby's answer is also reasonable. Breaking the corner at C4 and D4 is normally quite huge. However black needs two threats in this game. After C4/D4 exchange, the subsequent ko threats appear to be too small.

The complete game record is at http://www.go4go.net/go/games/sgfview/35783
Author:  wineandgolover [ Thu Aug 29, 2013 4:30 am ]
Post subject:  Re: Guess the next move
Thanks, macelee.

Like Kirby, I too appreciate these sorts of posts. Even if I did start the "breathing" thread he mentioned. :blackeye:
Author:  macelee [ Thu Aug 29, 2013 11:42 am ]
Post subject:  Re: Guess the next move
wineandgolover wrote:
Thanks, macelee.

Like Kirby, I too appreciate these sorts of posts. Even if I did start the "breathing" thread he mentioned. :blackeye:


I will definitely post more like this one.
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