Gomoto's Fuseki Studies Vol. 7: Early 3-3 invasion * 2

Gomoto · #1

Why is the marked move a very bad idea?
White has to play at a instead of the marked stone at all costs.

Click Here To Show Diagram Code: [go]$$ $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X X X . . . . . . . . . . . . | $$ | . . X X O O O a . . . . . . . . . . . | $$ | . . O O . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . W . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O O . . . . . , . . . . . , . . . | $$ | . . X X O O O O . . . . . . . X . . . | $$ | . . . . X X X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

Gomoto · #2

I thought it is good enough for black to get in move 1 (hane at the head of 3 stones).
But if white plays move 8 in this variation, a critical position arises on the board.

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

Gomoto · #3

The next moves are forced and black has to start this sequence at once. White plays at a,b or c but black has reached a lead early in the game.

Thats why the marked move was a bad idea!

Click Here To Show Diagram Code: [go]$$B $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X X X X . . . . . . . . . . . | $$ | . . X X O O O X O . . . . . . . . . . | $$ | . 7 O O 3 . . O X , . . . . . X . . . | $$ | . . . . . 2 6 O X . . . . . . . . . . | $$ | . . . b . . 5 1 O a . . . . . . . . . | $$ | . . . . . . . 4 . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . W . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . c O O . . . . . , . . . . . , . . . | $$ | . . X X O O O O . . . . . . . X . . . | $$ | . . . . X X X . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

possible continuation:

Gomoto · #4

Additional Info:

Most of the time white should play the double hane instead of a.

Click Here To Show Diagram Code: [go]$$B $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O O . . . . . , . . . . . , . . . | $$ | . . X X O a . . . . . . . . . X . . . | $$ | . . . . X W . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

EdLee · #5

Hi Gomoto, Thanks.

For the less experienced who may not be able to read as far,
there's a nice heuristic in the early chapters of Bruce Wilcox's Contact Fights:
the :white:

string has only 4 liberties ( v. 5 for the adjacent :black:

),
and he suggests it could be a warning for :white:

,
and that :white:

study the situation carefully
to decide if tenuki is wise for :white:

:

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

( Of course, he emphasizes all these heuristics are merely guidelines, and extensive reading and global evaluation are key. )

Gomoto · #6

The fuseki continues. This is not good for white. White should have played different Josekis.

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

Gomoto · #7

But be aware that black should not play the marked stone in this fuseki. This is not a good move. The better options for black are the moves a,b or c.

Click Here To Show Diagram Code: [go]$$ $$ +---------------------------------------+ $$ | . . . . . X . . . . . . . . . . . . . | $$ | . . O O X . X . . . . . . . . . . . . | $$ | . . X X O X . . . . . . . c . . . . . | $$ | . . O O O . . . . , . . . b . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . B , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . a . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O O O . . . . , . . . . . , . . . | $$ | . . X X O X . . . . . . . . . X . . . | $$ | . . O O X . X . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

Uberdude · #8

Gomoto wrote:

The fuseki continues. This is not good for white. White should have played different Josekis.

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

However, check out this KGS 9d beating a KGS 6d as white with this opening (but double black 4-4).

Gomoto · #9

If white wants to win it plays like this. This position is very good for white.
(black should not follow whites plan like this)

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

Uberdude · **#10**

Gomoto wrote:

The next moves are forced and black has to start this sequence at once. White plays at a,b or c but black has reached a lead early in the game.

Click Here To Show Diagram Code: [go]$$B $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . X X X X . . . . . . . . . . . | $$ | . . X X O O O X O . . . . . . . . . . | $$ | . 7 O O 3 . . O X , . . . . . X . . . | $$ | . . . . . 2 6 O B . . . . . . . . . . | $$ | . . . b . . 5 1 O a . . . . . . . . . | $$ | . . . . . . . 4 . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . W . . . . . , . . . . . , . . . |[/go]

Nice shortage of liberties tesuji with 7 there. Interestingly enough, I saw AQ play Yoda Norimoto a few days ago (unfortunately game now gone from WBaduk) and AQ as white played the hane block exchange above 7 before tenukiing and allowing black the painful hane at the head of the 3 stone wall (Yoda played marked stone as extend to hoshi though instead of keep pushing). At the time I thought it might be silly bot flitting, but if it was foresight to prevent the tesuji of 7 that's impressive! (AQ made a big centre but not big enough I think, until Yoda made some really dumb misread in yose and a bunch of his stones got captured on the 1st line).

Gomoto's Fuseki Studies Vol. 7: Early 3-3 invasion * 2

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