🚀 go-pugleaf

Lukas Geyer wrote:
> 
> "Bohr, Mike" <Mike_Bohr@gmx.net> writes:
> 
> > how can I activate the analysis mode? I've xBoard GNU chess v5.02
> 
> GNU chess is not yet capable of analysis, we are working on it.

The command line 'post' output is very similar to the analysis
mode of most engines, which is why I have a minimal working
analysis change somewhere, it is five minutes work. i.e.

./gnuchess
st 10000
post
book off
e4   (or "load position.fen", "go")
ctrl-C to stop thinking.

Will print out depth information, nodes searched, and principal
variation, plus some weird symbols which do mean something
honest.

What we have remaining is "merely" to tell gnuchess how to
understand when xboard wants it to stop thinking and do
something (like tell it the analysis so far), ironically this is
harder than the analysis code itself.

I think also that analysis has to print out some other number,
which we don't currently track in the code, but I don't think
that is a big issue.

I'm keen to get analysis in as it makes the program work better
with SCID, as well as helping us spot problems with it's game.

Meantime if you want to know more about GNU Chess thinking than
"Show Thinking" gives you I'm afraid it is the command line.

Lukas has done much of the work for handling the communication
aspects, I have to check it, and we will probably add pondering
at the same time.

 Simon

PS: Anyone want to think about sorting moves. Looking at the
code we spend a long time calculating the "SwapOff" value of
moves, and use this to sort moves. I'm sure there are probably
computationally cheaper ways of deciding which moves to consider
first. Even just "capture piece value - capturing piece value"
is pretty close, and a LOT faster.

PPS: Similarly preserving information on HashMv/Killer1/Killer2
and similar between moves could lead to a significant gain in
strength.