Search found 2668 matches

by mcostalba
Thu Sep 25, 2008 12:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Will your engine play better or worse?
Replies: 10
Views: 2399

Re: Will your engine play better or worse?

score = -Search(... if(score > alpha && score < beta && beta - score < 5) score = beta; Sorry for my silly question. But with null window searching if score > alpha && score < beta then it is always true that beta - score < 5 Am I missing something ? Do you intend to apply to PV search only ? Thank...
by mcostalba
Thu Sep 25, 2008 11:58 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Superlinear interpolator: a nice novelity ?

... To have properly compiled versions for 32 and 6f bits would be great ! Thanks Marco To realize that to have access to the source code would be nice. Sorry but I don't understund the question. Sources link has been already published in this thread: http://digilander.libero.it/mcostalba/glaurung_...
by mcostalba
Wed Sep 24, 2008 11:26 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Spare CPU cycles anyone?
Replies: 1
Views: 625

Spare CPU cycles anyone?

I start to understund that a big obstacle to chess programming developing is testing. That’s what I have learned so far: -Chess programming is tough. - A big part of the difficult is that the link between a modification and result in terms of ELO gain/loose is not obvious to say the least. - It is e...
by mcostalba
Tue Sep 23, 2008 5:00 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Superlinear interpolator: a nice novelity ?

This is the final test result for tonight:

After 404 matches 1m+0

Processor Intel core 2 Duo T5250
Windows Vista 32 bit
Chessbase GUI

Glaurung clone 210908 JA vs Glaurung 2.1 (JA) +127 =194 -83 (55.4%) TP=+38 elo

It seems it is still in advantage :)

Marco
by mcostalba
Mon Sep 22, 2008 9:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Superlinear interpolator: a nice novelity ?

Why do you call it super linear, but not sigmoid? Sorry for my ignorance, Gerd After looking in wiki at http://en.wikipedia.org/wiki/Sigmoid_function (the ignorance is all on my side!) I have to say that Sigmoid is the proper name...yes it defenitly is, although my is a linearized version, the sigm...
by mcostalba
Mon Sep 22, 2008 5:42 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Glaurung compiles from Jim!

Marco, here are the compiles from Jim Ablett. Jim writes that the version you made seems to have a slightly lower nodes per second than the original Glaurung 2.1 Great! I have started testing now! May I ask, please, what is the compiler used (my guess is Intel C++ :wink: ) ? The reason I ask is tha...
by mcostalba
Mon Sep 22, 2008 12:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Superlinear interpolator: a nice novelity ?

Thanks very much for your Glaurung version Marco! I only had a short look yet at the sources but it looks very interesting and there also seems to be a substantial amount of changes that are more programming-technical in nature, changes I think Tord, or other programmers, here will be interested in...
by mcostalba
Mon Sep 22, 2008 5:14 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Superlinear interpolator: a nice novelity ?

Does this mean you are only comparing stock G2.1 to your modified version? That won't tell you anything useful at all... That's interesting. You seem very sure about this. Could you please explain me why ? Answering to other comments in this thread, I would think the truncation is an integral part ...
by mcostalba
Sun Sep 21, 2008 7:52 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Re: Superlinear interpolator: a nice novelity ?

I have upload a snapshot here: http://digilander.libero.it/mcostalba/glaurung_clone_210908.zip Yes, it is a direct link to a zip file, this time no fancy html front page, sorry :wink: I will not give ELO differences because I am mostly interested in testing my test environment more then Glaurung mod...
by mcostalba
Sat Sep 20, 2008 7:25 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Superlinear interpolator: a nice novelity ?
Replies: 37
Views: 12311

Superlinear interpolator: a nice novelity ?

It seems I was able to give a good boost to Glaurung 2.1 with this new (at least for me) idea. Currently Glaurung for a given position evaluates middle game and an endgame score. Then these scores are linearly interpolated based on the phase of the game: Having mv, ev and ph (mid value, end value an...