Re: [computer-go] Super Ko on KGS ignores player to move

[John Tromp <John.Tromp@xxxxxx>]

Nick Wedd wrote:
> There seems to be some confusion about the various superko rules.  I 
> know of three such rules:
>
> 1.  Positional Super Ko
> A play may not recreate a previous board position from the game.
>
> 2.  Situational Super Ko
> A play may not recreate a previous board position from the game, with 
> the same player to move next.
>
> 3.  Natural Situational Super Ko
> A player may not play to recreate a board position, if s/he played to 
> create it previously.
These 3 types roughly correspond to the number of possible 1x1 games:


PSK has 1 game: pass pass

SSK has 2 games: pass pass
                 A1 pass pass

NSSK has 5 games: pass pass
                  pass A1 pass pass
                  pass A1 A1 pass pass
                  A1 pass pass
                  A1 A1 pass pass

As an exercise, try to work out the number of 1x2 games under the 3 rules:-)

regards,
-John
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