Re: [computer-go] citation

[Paul Pogonyshev <pogonyshev@xxxxxxx>]

Xavier Combelle wrote:
> My reading a old thread about citation and ladders I saw that:
> >I think similarly I wouldn't be surprised if most programs would think a
> >double-headed dragon (i.e. two connected false eyes) is actually dead. But
> >to take advantage of that knowledge is next to impossible.
> >
> >    Mark Boon
>
> My question is : is this kind of position ?
>
> $$  -----------------------------------------
> $$  | . . . . O X X X . . . . . . . . . . . |
> $$  | . . . . O X . X O O . . . . . . . . . |
> $$  | . . . O . O X . X O . . . . . . . . . |
> $$  | . . . . . O X X X O . . . . . . . . . |
> $$  | . . . . . . O O O O . . . . . . . . . |
> $$  | . . . . . . . . . . . . . . . . . . . |

No, these are two proper eyes.

Consider this (I think GNU Go somewhen stumbled into this sort
of things and of course failed to play properly):

  . X X X X X X X . .
  . X O O O O O X X X
  . X O X X X O O O X
  X X O X . X O . O X
  X O . O X . X O X X
  X O O O X X X O X .
  X X X O O O O O X .
  . . X X X X X X X .

Here white (O) dragon has two false eyes, but lives.

Paul

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