[Computer-go] Board Sizes

Rémi Coulom remi.coulom at free.fr
Mon Jan 7 06:07:17 PST 2013

On 01/07/2013 03:02 PM, Vlad Dumitrescu wrote:
> Hi!
> On Mon, Jan 7, 2013 at 2:51 PM, Don Dailey <dailey.don at gmail.com 
> <mailto:dailey.don at gmail.com>> wrote:
>         2013/1/7 Don Dailey <dailey.don at gmail.com
>         <mailto:dailey.don at gmail.com>>
>             I have a question concerning a related question,  mirror
>             go.    On an even board the second player can presumably
>             just mirror the opponent and never lose but I am not sure
>             I buy that.   I am a very weak player myself but is it
>             true that cannot force your opponent into a bad move if he
>             mirrors you?     And if mirror go is a valid way to stay
>             even couldn't a pro just sacrifice something in the center
>             to break the symmetry? 
>         I'm talking about even boards,  not odd boards.     I know
>         that odd boards cannot be mirrored indefinitely.
> It's easy to come up with a way to force breaking the symmetry: play 
> the center as a cross-cut and black then gives atari: if white gives 
> atari too, black captures and white cannot do likewise because of the 
> missing captured stone. So white is forced to protect the atari and 
> symmetry is broken. Black can then get a better position in the center 
> in sente.
> regards,
> Vlad

But you can't get a cross-cut in the center with mirror go.

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