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 Post subject: Macelee's study journal of interesting pro games: 2013-09-07
Post #1 Posted: Sat Sep 07, 2013 7:53 am 
Lives in sente

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I promised a few days ago to present more interesting pro games. It is not difficult at all to find one in the recent Samsung Cup. The two players are 60-year-old Seo Bongsoo 9p of Korea and much younger Wu Guangya 6p of China. The two together set a record by playing a 392-move-long game in round 3, by far the longest game in any international tournament (http://www.go4go.net/go/games/sgfview/36126).

Today, however, I want to show another game between the two. In the group stage of Samsung Cup, where double-elimination format is used, it is possible for two players to meet twice.

The complete game record is at: http://www.go4go.net/go/games/sgfview/36058

Let's start from a good tesuji Seo played: :bs: is a very sharp move. I've introduced this tesuji a few weeks ago in another post (see here: http://www.go4go.net/go/games/sgfview/34774/33). When under attack like this, few pro players would consider the submissive answers such as Q9 or Q10. :w54: accepted the challenge but it was probably an overplay. After :b63:, the upper-right group is in great danger.
Click Here To Show Diagram Code
[go]$$Wcm54
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X X . . . |
$$ | . . . O . X . X X . . . X . O X O . . |
$$ | . . . , O X X O O X X X . . O X X O . |
$$ | . . X . O X O X O O . . . . . O O . . |
$$ | . . . . O O O . . . . . . O O X . . . |
$$ | . . . . . . . . . . . 0 . . . . X X . |
$$ | . . X . . . . . . . . . 6 . X X O . . |
$$ | . . . . . . . . . . . . . . X O O . . |
$$ | . . . , . . . . . , . . . 1 O 2 3 . . |
$$ | . . X . . . . . . . . . . 7 # 4 5 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . 8 . 9 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


:w64: appears to be sente against the 5 black stones - if black plays at :b69:, white would save everything at 'a'. However, :b65: is a good move. In the end white can only manage to save a small corner in gote, which is of course not acceptable.
Click Here To Show Diagram Code
[go]$$Wcm64
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . 6 X X 1 a . |
$$ | . . . O . X . X X . . . X . O X O . 3 |
$$ | . . . , O X X O O X X X . . O X X O . |
$$ | . . X . O X O X O O . . . . 5 O O 2 7 |
$$ | . . . . O O O . . . . . . O O X 4 8 . |
$$ | . . . . . . . . . . . X . . . . X X . |
$$ | . . X . . . . . . . . . X . X X O . . |
$$ | . . . . . . . . . . . . . . X O O . . |
$$ | . . . , . . . . . , . . . O O X O . . |
$$ | . . X . . . . . . . . . . O X X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . X O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Next, let's have a look how in a few moves Wu Guangya managed to turn his luck around. :b75: is the common move in this shape, but with hindsight it was probably a mistake. :w78: is a brilliant move.

In my last post, I've presented one example creating ko threats before starting a ko fight. :w78: is exactly doing that. But we need to check first where is the ko fight.
Click Here To Show Diagram Code
[go]$$Wcm72
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . X X X O . . |
$$ | . . . O . X . X X . . . X . O X O . O |
$$ | . . . , O X X O O X X X . . O X X O . |
$$ | . . X . O X O X O O . . . . O O O X O |
$$ | . . . . O O O . . . . . . O O X X X 6 |
$$ | . . . . . . . . . . . X . . . . X X . |
$$ | . . X . . . . . . . . . X . X X O 5 . |
$$ | . . . . . . . . . . . . . . X O O . . |
$$ | . . . , . . . . . , . . . O O X O . . |
$$ | . . X . . . . . . . . . . O X X O . . |
$$ | . . . . . . . . . . . . . 1 . . . . . |
$$ | . . . . . . . . . . . . . . X . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . . , . . . 9 . , 3 . . |
$$ | . . . . . . . . . . . . 4 . . X O . . |
$$ | . . . . . . . . . . . . . . 7 8 2 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


White played a good combination :w82: and :w84:. :b85: and :b87: probably have other options. But I believe pro players should have read through all the variations. :w88: further increased the value of the ko threats. Then......
Click Here To Show Diagram Code
[go]$$Bcm81
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . X X X O . . |
$$ | . . . O . X . X X . . . X . O X O . O |
$$ | . . . , O X X O O X X X . . O X X O . |
$$ | . . X . O X O X O O 7 . . . O O O X O |
$$ | . . . . O O O . . . 3 2 . O O X X X X |
$$ | . . . . . . . . . . 6 X 4 . . . X X . |
$$ | . . X . . . . . . . . 5 X . X X O O . |
$$ | . . . . . . . . . . . . . . X O O . . |
$$ | . . . , . . . . . , . . . O O X O . . |
$$ | . . X . . . . . . . . . . O X X O . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . X . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . O . . . . . , . . . O 9 0 O . . |
$$ | . . . . . . . . . . . . X 1 8 X O . . |
$$ | . . . . . . . . . . . . . . O X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


To continue, :w92: and :w94: are the final tesujis to form a big ko fight.
Click Here To Show Diagram Code
[go]$$Bcm91 :w98: @ :w92:
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . X X X O . . |
$$ | . . . O . X . X X . . . X . O X O . O |
$$ | . . . , O X X O O X X X . . O X X O . |
$$ | . . X . O X O X O O X . . . O O O X O |
$$ | . . . . O O O . . . X O . O O X X X X |
$$ | . . . . . . . . . . O X O 5 6 7 X X . |
$$ | . . X . . . . . . . . X X 2 X X O O . |
$$ | . . . . . . . . . . . . 4 3 X O O . . |
$$ | . . . , . . . . . , . . . O O X O . . |
$$ | . . X . . . . . . . . . . O X X O . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . X . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . 1 O . . . |
$$ | . . . O . . . . . , . . . O X O O . . |
$$ | . . . . . . . . . . . . X X O X O . . |
$$ | . . . . . . . . . . . . . . O X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


This is the position when the ko was settled - white sacrificed all the stones that was in trouble earlier, in exchange for 51 points of very solid territory (not even including the values of the extremely weak N3/O3 stones and the potential of the white wall in the middle).
Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . X X X O . . |
$$ | . . . O . X . X X . . . X . O X O O O |
$$ | . . . , O X X O O X X X . . O X X O X |
$$ | . . X . O X O X O O X . . . O O O X . |
$$ | . . . . O O O . . . X O X O O X X X X |
$$ | . . . . . . . . . . O X . X O X X X . |
$$ | . . X . . . . . . . X X X . X X O O . |
$$ | . . . . . . . . . . . O O X X O O . . |
$$ | . . . , . . . . . , . . . O O X O . . |
$$ | . . X . . . . . . . . . . O X X O . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . X . O . . |
$$ | . . . . . . . . . . . . . O O . . . . |
$$ | . . . . . . . . . . . . 1 . . O . . . |
$$ | . . . O . . . . . , . . . O . O O . . |
$$ | . . . . . . . . . . . . X X O X O . . |
$$ | . . . . . . . . . . . . . . O X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


This post by macelee was liked by 3 people: ez4u, gasana, zaqxswcde
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 Post subject: Re: Macelee's study journal of interesting pro games: 2013-0
Post #2 Posted: Tue Sep 10, 2013 10:34 am 
Oza
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Thanks for the game - an interesting fight.

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 Post subject: Re: Macelee's study journal of interesting pro games: 2013-0
Post #3 Posted: Tue Sep 10, 2013 5:50 pm 
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I would have tried to save that white corner. That sort of thing is why I am not a pro.

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