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Re: [gnugo-devel] ladder issue

From: Arend Bayer
Subject: Re: [gnugo-devel] ladder issue
Date: Sun, 2 Feb 2003 01:10:01 +0100 (CET)

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

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.


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