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RE: computer-go: Defeating mirror Go



On 22-Sep-00 Roland wrote:
> Hello computer-go,
> 
>   I think there is a way to defeat any kind of mirror GO if the
>   super-ko rules is valid(no repeated positions allowed). Here is how:
>  Create the following pattern:

You don't even need super-ko (or any ko) to defeat mirror go through the
center point.  Here's a toughie for black:

White to move.

     A B C D E F G H J K L M N O P Q R S T
  19 . . . . . . . . . . . . . . . . . . . 19
  18 . . . . . . . . . . . . . . . . . . . 18
  17 . . . . . . . . . . . . . . . . . . . 17
  16 . . . . . # # # # # O O O O . . . . . 16
  15 . . . . # O O O O O # # # # O . . . . 15
  14 . . . . # O # # # . O O O # O . . . . 14
  13 . . . . # O # . . . . . O # O . . . . 13
  12 . . . . # O # . . # # . O # O . . . . 12
  11 . . . . # O # . # . # . O # O . . . . 11
  10 . . . . # O # . # # # . O # O . . . . 10
   9 . . . . # O # . # . # . O # O . . . . 9
   8 . . . . # O # . # # . . O # O . . . . 8
   7 . . . . # O # . . . . . O # O . . . . 7
   6 . . . . # O # # # . O O O # O . . . . 6
   5 . . . . # O O O O # # # # # O . . . . 5
   4 . . . . . # # # # O O O O O . . . . . 4
   3 . . . . . . . . . . . . . . . . . . . 3
   2 . . . . . . . . . . . . . . . . . . . 2
   1 . . . . . . . . . . . . . . . . . . . 1
     A B C D E F G H J K L M N O P Q R S T

Of course, I think you have to fall back to super ko if black places the
vertical line of stones that William suggested and the mirror is through that
line.

-Tom J.

---
Thomas P. Johnson
Strategic Forecasting                       ph:  (607) 266-7636
Box 1034 Langmuir Lab                       fax: (607) 257-4279
95 Brown Rd.                  tjohnson@xxxxxxxxxxxxxxxxx
Ithaca, NY 14850            http://www.strategicforecasting.com