3-4 - high approach - two-space high pincer - ogeima joseki

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Dusk Eagle
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3-4 - high approach - two-space high pincer - ogeima joseki

Post by Dusk Eagle »

The fuseki below has been played by professionals many times. Its early moves revolve around a well-known joseki in the top right, and that joseki is the focus of my question.
Click Here To Show Diagram Code
[go]$$c
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . 0 . . |
$$ | . . . . . . . . . . . . . 5 7 X 6 . . |
$$ | . . . O . . . . . , . . O . . 4 . . . |
$$ | . . . . . . . . . . . . 9 3 1 O . . . |
$$ | . . . . . . . . . . . . . 8 2 . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . X . . . . X . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bcm11
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . X X X O . . |
$$ | . . . O . . . . . , . . O . . O 0 9 . |
$$ | . . . . . . . . . . . . X X X O 6 5 . |
$$ | . . . . . . . . . . . . . O O 1 3 7 . |
$$ | . . . . . . . . . . . . . . . 2 4 8 . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . X . . . . X . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bcm21
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O 6 . |
$$ | . . . . . . . . . . . . . X X X O 5 . |
$$ | . . . O . . . . . , . . O . . O O X . |
$$ | . . . . . . . . . . . . X X X O O X . |
$$ | . . . . . . . . . . . . . O O X X X . |
$$ | . . . . . . . . . . . . . . 1 O O O . |
$$ | . . . . . . . . . . . . . . . X . 4 . |
$$ | . . . . . . . . . . . . . . . . 3 2 . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . X . . . . X . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bcm27
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O O 1 |
$$ | . . . . . . . . . . . . . X X X O X . |
$$ | . . . O . . . . . , . . O . . O O X . |
$$ | . . . . . . . . . . . . X X X O O X . |
$$ | . . . . . . . . . . . . 8 O O X X X 2 |
$$ | . . . . . . . . . . . . . 7 X O O O 3 |
$$ | . . . . . . . . . . . . . . 6 X . O 4 |
$$ | . . . . . . . . . . . . . . . . X O . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . 5 . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . X . . . . X . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
(For more, see http://loveku.livejournal.com/?skip=2)

My question is: What is the purpose of playing the :b27: - :w30: exchange for black? I don't really see what benefit this exchange offers.
We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.
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RobertJasiek
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Re: 3-4 - high approach - two-space high pincer - ogeima jos

Post by RobertJasiek »

Besides maintaining the ordenary eyespace and endgame option Q18, Black looks for a chance to get S10 and T16 with the idea of White T13 - Black R12 to create an approach liberty problem. IOW, R18 is not quite as alive as White would like it to be.
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