Ofcourse they can know. They just have to check for it.
Those programs that do well against mirror go probably all do check for it.
What to do about it is a bigger problem.
My suggestion would be to make an extra search that assumes mirror play by the 
opponent.
This has to be taken with a grain of salt, because the opponent could deviate 
at any time.
So what could be done is to add a small fraction of the mirror search winrates 
to the regular search win rates.

Stefan

  ----- Original Message ----- 
  From: Don Dailey 
  To: computer-go 
  Sent: Monday, July 20, 2009 4:01 PM
  Subject: Re: [computer-go] Re: Mirror Go against Zen


  Ok, so I am right about this,  you take advantage of the asymmetry of 
captures.  

  But go programs do not KNOW they are playing mirror go and would have no 
motivation to specifically set this up.   So how is it that some equally strong 
programs have no problem while others do?

  - Don



  On Mon, Jul 20, 2009 at 9:48 AM, Seo Sanghyeon <[email protected]> wrote:

    2009/7/20 Don Dailey <[email protected]>:

    > Again, I don't understand go so well, but how do you win against mirror
    > go?


    You setup two ladders that collide.

    --
    Seo Sanghyeon

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