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Cool tesuji bro.
http://www.lifein19x19.com/viewtopic.php?f=15&t=3201		 Page 1 of 1
Author:  Solomon [ Sun Feb 13, 2011 5:50 pm ]
Post subject:  Cool tesuji bro.
Was randomly kibitzing a game between two mid/high dans, saw a pretty interesting endgame play that I thought people might be interested in:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . . X O X . O X X O O O X X O O O X |
$$ | . . O O X X . . . O X O X . . X O O O |
$$ | . O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  Shaddy [ Sun Feb 13, 2011 6:55 pm ]
Post subject:  Re: Cool tesuji bro.
Araban wrote:
Was randomly kibitzing a game between two mid/high dans, saw a pretty interesting endgame play that I thought people might be interested in:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . . X O X . O X X O O O X X O O O X |
$$ | . . O O X X . . . O X O X . . X O O O |
$$ | . O . . O . . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . . X O X . O X X O O O X X O O O X |
$$ | 1 3 O O X X . . . O X O X . . X O O O |
$$ | 2 O . . O . . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | 4 X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


A ko?
Author:  Solomon [ Sun Feb 13, 2011 7:02 pm ]
Post subject:  Re: Cool tesuji bro.
Shaddy wrote:
Araban wrote:
Was randomly kibitzing a game between two mid/high dans, saw a pretty interesting endgame play that I thought people might be interested in:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . . X O X . O X X O O O X X O O O X |
$$ | . . O O X X . . . O X O X . . X O O O |
$$ | . O . . O . . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . . X O X . O X X O O O X X O O O X |
$$ | 1 3 O O X X . . . O X O X . . X O O O |
$$ | 2 O . . O . . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | 4 X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


A ko?

Looking for something better, since W could just:
Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | 4 6 . X O X . O X X O O O X X O O O X |
$$ | 1 2 O O X X . . . O X O X . . X O O O |
$$ | 3 O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | 5 X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  Solomon [ Sun Feb 13, 2011 7:08 pm ]
Post subject:  Re: Cool tesuji bro.
I made a small mistake in the original diagram, fixed it up sorry! ('small' in the sense that the adjustment isn't large; it is still significant!)

Also, I'm not making any guarantees that a solution exists; could easily be wrong, since this comes from a raw game, not a tsumego book.
Author:  topazg [ Sun Feb 13, 2011 7:14 pm ]
Post subject:  Re: Cool tesuji bro.
With that adjustment, the shape move at B10 looks promising? Though:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | 7 . . . O . . . . O O X X X X X X X X |
$$ | 6 1 5 X O X . O X X O O O X X O O O X |
$$ | 3 2 O O X X . . . O X O X . . X O O O |
$$ | 4 O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O 8 . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


White lives in double ko here? Bah... this doesn't work either:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | 5 1 3 X O X . O X X O O O X X O O O X |
$$ | 4 2 O O X X . . . O X O X . . X O O O |
$$ | . O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O 6 . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  Perception [ Sun Feb 13, 2011 7:18 pm ]
Post subject:  Re: Cool tesuji bro.
I think this is right, not sure so please check and let me know if I missed something.
Click Here To Show Diagram Code
[go]$$Bcm1 7 at 1, 8 at 3, 10 connects.
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | 4 2 5 X O X . O X X O O O X X O O O X |
$$ | 3 1 O O X X . . . O X O X . . X O O O |
$$ | 6 O 9 X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Click Here To Show Diagram Code
[go]$$Bcm1 7 at 1, 8 at 3, 10 connects.
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . 1 . . O . . . . O O X X X X X X X X |
$$ | O O X X O X . O X X O O O X X O O O X |
$$ | O O O O X X . . . O X O X . . X O O O |
$$ | O O X X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Since white can't resist he has to give way.
Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | 4 2 6 X O X . O X X O O O X X O O O X |
$$ | 3 1 O O X X . . . O X O X . . X O O O |
$$ | 7 O 5 X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Edit: Or save his group at the bottom.
Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . 3 X O X . O X X O O O X X O O O X |
$$ | . 1 O O X X . . . O X O X . . X O O O |
$$ | . O 5 X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O 2 4 X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


When I was looking at the diagram before it was fixed I was looking at this same sequence except white could have let black capture after this :b1: and it comes to nothing (unless I missed something of course).
Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | . . . X O X . O X X O O O X X O O O X |
$$ | . . O O X X . . . O X O X . . X O O O |
$$ | . O 2 1 O . . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O . . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Author:  Shaddy [ Sun Feb 13, 2011 7:42 pm ]
Post subject:  Re: Cool tesuji bro.
topazg wrote:
With that adjustment, the shape move at B10 looks promising? Though:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | 7 . . . O . . . . O O X X X X X X X X |
$$ | 6 1 5 X O X . O X X O O O X X O O O X |
$$ | 3 2 O O X X . . . O X O X . . X O O O |
$$ | 4 O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O 8 . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


White lives in double ko here? Bah... this doesn't work either:

Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | . . . . O . . . . O O X X X X X X X X |
$$ | 5 1 3 X O X . O X X O O O X X O O O X |
$$ | 4 2 O O X X . . . O X O X . . X O O O |
$$ | . O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O 6 . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]



Click Here To Show Diagram Code
[go]$$Bcm1 B to play (W's last move marked).
$$ ---------------------------------------
$$ | . . . . . . . . . X O O O O O . . . . |
$$ | X X O O X . . . X X O X X O . O . . . |
$$ | . X O X . . . . X O O X X O O O . O . |
$$ | O X O X . . . . X X X X O X O X X X . |
$$ | . O X X . . . . . . O O O X X O . O O |
$$ | O . O O X X X . . . . X X . X O O . X |
$$ | . O . . O O O X X . X . . . . X O . . |
$$ | . . . . . . . O . O X O O . X . O . . |
$$ | 7 . . . O . . . . O O X X X X X X X X |
$$ | 6 1 5 X O X . O X X O O O X X O O O X |
$$ | 3 2 O O X X . . . O X O X . . X O O O |
$$ | 4 O . X O O . . O O X X . X X X O . . |
$$ | X O O X X O O O . X . . X . X X O O O |
$$ | . X X O X X X O . . X . X O O O X O . |
$$ | X X X O 8 . X O X X . . X O . O X X . |
$$ | . X O O . O O X . , X X O . . O O . X |
$$ | . X X O O X X X X X O O O . . . O . . |
$$ | . X O W O O . X X O O . . . . . . . . |
$$ | . X X O . O . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


7 here should be c8, and then black has a ko, so the best for white is to let him connect under.


Yeah, that's a pretty important change, :lol:
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