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An Endgame Position w/ Questions
http://prod.lifein19x19.com/viewtopic.php?f=15&t=7735		 Page 1 of 1
Author:  logan [ Fri Jan 25, 2013 8:33 am ]
Post subject:  An Endgame Position w/ Questions
Base position:
Click Here To Show Diagram Code
[go]$$Bcm1 Black to play
$$ -------------------
$$ | . . . . . O . . . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]


Question 1:
Which is larger?
Click Here To Show Diagram Code
[go]$$Bcm1
$$ -------------------
$$ | . . . . b O a . . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]

Question 2:
Assuming White ignores :b3:, what is the value of Black's followup?
Click Here To Show Diagram Code
[go]$$Bcm1
$$ -------------------
$$ | . . . . 1 O 2 3 . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]

Question 3:
Assuming Black ignores :w2:, what is the value of White's followup?
Click Here To Show Diagram Code
[go]$$Bcm1
$$ -------------------
$$ | . . . . 1 O 2 . . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]

Question 4:
Having answered the previous questions, assume White can make a ko on the board with a variable value. At what value of the ko should Black choose A or B? Or does the value of the ko not affect Black's choice?
Click Here To Show Diagram Code
[go]$$Bcm1
$$ -------------------
$$ | . . . . b O a . . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]

Final question:
In this position should Black answer A or B?
Click Here To Show Diagram Code
[go]$$Bcm1 Black to play
$$ -------------------
$$ | . . . . b O a . . |
$$ | . . O O O X . X . |
$$ | . O X X X X . . . |
$$ | O . O . X . X . . |
$$ | O O O X . . . X X |
$$ | X X X X X X X O X |
$$ | . X . O X O O O X |
$$ | . X X O O . . . O |
$$ | . . X O . O . O . |
$$ -------------------[/go]
Author:  Bill Spight [ Fri Jan 25, 2013 1:23 pm ]
Post subject:  Re: An Endgame Position w/ Questions
I think that this answers everything. :)



Generally speaking, a ko on the board would not affect the best play, but I expect that a position could be constructed where it would. :)
Author:  logan [ Sat Jan 26, 2013 8:15 am ]
Post subject:  Re: An Endgame Position w/ Questions
Thank-you for your enthusiastic effort Bill.

I hope other people can also answer the questions for themselves and learn more about this endgame position (and how to apply it in their own games).
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