[Computer-go] pachi2

[Petr Baudis]

On Thu, Jan 13, 2011 at 10:25:28AM -0500, fastgo wrote:
> I guess we are not talking about the same case or I may have misread the
> issue or the example. I was commenting on the second example. My take is
> that it is corner as Petr stated "Example is the other bottom corner of the
> same game:"
> 
>     O O . . . .
>     O O X X X X
>     . X O O X . 3
>     . X O . O X 2
>     . X O O . X 1
          P R S T

> 
> I meant to say that if it is corner as the diagram shown, then the playout
> should almost always get it right. As the middle bottom white group has only
> 2 liberties left and the left black group has 3 liberties. Any attempt by
> the white group to take one liberty of the left black group will trigger
> black to immediately check its surroundings and kill the white group.
> 
> Even in cases where the liberties of the 5 liberty group are played first by
> the white group, and when it goes down to 2 liberties, the black will check
> its surroundings and kill the bottom white group first.

No, if white takes any liberty of the left group, it is over - black
loses the semeai. The white group has effectively three liberties - R2,
S1 and T3.

-- 
				Petr "Pasky" Baudis
Computer science education cannot make an expert programmer any more
than studying brushes and pigment can make an expert painter. --esr