Re: [gnugo-devel] ladder issue

[Arend Bayer]

On Sun, 2 Feb 2003, Portela Fernand wrote:
> The appended game features an interesting phenomenon : GnuGO playing out a
> ladder for about 20 moves. Important to notice is the time taken by GG for
> playing the ladder (moves 31 to 59). It seems, such kind of positions really
> "kill" the engine.
>
> Else, I have no clue what is happening here. I hope someone will shed some
> light...

It looks like the same problem as reported by Mike Vaughn
(http://mail.gnu.org/archive/html/gnugo-devel/2002-12/msg00122.html).

The problem is that playing the ladder pushes the reading for the
neighbouring black stones beyond some depths limits. This makes them
tactically alive...

I think I know how to fix this (the quick patch I posted in that thread
is _not_ the right fix), hope to post a patch soon.

Arend