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Up Topic Rybka Support & Discussion / Rybka Discussion / Rybka 2.3.2a 64 2CPU greatly improved in CEGT 40/120
- - By Heinz van Kempen (***) Date 2007-07-15 15:59
Hi all :-),

Rybka 2.3.2a 64 2CPU played 15 matches with 50 games each against the same opponents than Rybka 2.3 64 2CPU and Rybka 2.1c 64 2CPU, giving an (at this level) almost unbelievable improvement by almost 50 ELO. You will find an interim rating list at the bottom of the Rybka 2.3.2a 64 2CPU matches thread in CEGT Forum:

A new official rating list will be given next Saturday including a new match for Rybka against Fruit 070327-SF1agg (a development version exceptionally tested in CEGT).

More than 200 matches with 50 games each you can replay in the Replay Zone sorted by engine versions. Moreover you find a result overview, rating progression and rating comparison to CEGT active chess and of course the complete downloads, with and without search depth and evaluation:

Updated today is the CEGT active chess list. Here the new Rybka also shows nice improvements over previous versions, no matter if you look at 64-bit, 32-bit mp or at single CPU versions.

Thanks as always to all CEGT testers for their motivation and endurance and to Michael Koppel who always has a lot of work to calculate the rating lists.

Best Regards
Parent - - By Vasik Rajlich (Silver) Date 2007-07-16 11:00

thanks for including Rybka 2.3.2a in your 40/120 list :)

Parent - - By Heinz van Kempen (***) Date 2007-07-17 01:10
Hi Vas :-),

always a pleasure to test you unbelievable engine. For future Rybka versions it might be a problem to confirm improvements by engine vs. engine matches due to missing strong competition still. For example I do not know how to improve results like 45,5:4,5 against Fruit 2.2 or 43,5:6,5 against Hiarcs 10 when draws can always happen at this high level. Improvements are still possible against Zap!Chess Zanzibar, but other results are already gorgeous.

I copy a post from George Tsavdaris as an answer to M. Ansari in CCC in order to shed some more light on this problem. Hope this is okay.

Best Regards

M ANSARI wrote:
So it does seem that 2.3.2a x64 is quite a bit stronger than Rybka 2.3 The strongest engine just got even stronger ... hard to believe. I wonder how much stronger Rybka can get. Obviously Rybka still has some weaknesses and can yet be improved, but really we must be reaching some sort of wall here.

George Tsavdaris

I don't like the word stronger in this cases. I prefer the expression "performing better".
And Rybka's latest version indeed has reached an amazing performance against the other engines as the ELO rating measures.

But it has still many many weaknesses in finding some tactics and especially in King attacks. Also in the endgame needs much improvement.

If these will improve a lot it will definitely improve a lot the analysis level one can reach of Rybka. But i'm not sure it will improve a lot the performance on eng-eng matches, that means i'm not sure it will have a lot higher ELO and that is because of the competition.
Since Rybka is a great amount of ELO ahead of the competition it should raise the scores even more from the amazing +80% it is now and with the draws as a natural element of Chess, i think it can't improve the performance much higher if the other engines don't improve their ELO much.....
Parent - - By Vasik Rajlich (Silver) Date 2007-07-18 07:45
Hi Heinz,

of course, performance (and strength - to me these are synonyms) can be improved quite a bit, there are tons of things to improve. If anything, we'll go faster now than in the past, because Larry Kaufman is on board. I feel very optimistic about Rybka 3.

We have also started to work a little bit on the issue of avoiding draws. Some first test results are already interesting.

Parent - - By Heinz van Kempen (***) Date 2007-07-21 11:13 Edited 2007-07-21 11:18
Hi Vas and all,

the new ratinglist is available at the website now adding a new 50 games match for Rybka 2.3.2a 64 2CPU against a Fruit beta. New apted opponents will be released soon and we will be able to push all Rybka versions to 1000 games and more each with tournament time control later this year.

Rybka 2.3.2a 64 2CPU now with an unbelievable performance of almost 3050 ELO, 52 ELO ahead of Rybka 2.3 64 2CPU. Lead over Zap!Chess Zanzibar 64 2CPU is now 118 ELO, over Deep Fritz 10 it is 164 ELO, over Deep Shredder 10 64 it is 192 ELO.... over Deep Junior 10 it is 217 ELO, all those with 2 CPU´s, indicated by "Deep" 

As expected Fruit 070327-SF1agg could not hold it´s initial high rating, but this is still good after 169 games only. With next list we will already have a fairly good comparison to Fruit 2.2, which is also currently receiving matches still missing.

Other news:

Our active chess rating list will be updated tomorrow like every Sunday (CEGT 40/120 only biweekly).

Wilhelm Hudetz is back to manage our Blitz rating list. Leto will be away for some time due to private matters.

Two new testers started.

2 Quad machines are added to CEGT 40/120. Not for testing 4 CPU engines, what will happen by the beginning of next year, but for running two dual core matches simultaneously using two different GUI´s.
Parent - By Vasik Rajlich (Silver) Date 2007-07-22 07:48
Thanks Heinz.

Parent - - By turbojuice1122 (Gold) Date 2007-07-17 01:50
Ahhh, it's good to see you in this forum Heinz!
Parent - By Heinz van Kempen (***) Date 2007-07-17 14:16
Hi Turbo :-),

except from CEGT Forum I only post in other fora when I have something interesting to tell, what rarely happens :-).

Anyway I like to read here almost all and I think it is an excellent forum with a lot of contributions at a good level.

Best Regards
Up Topic Rybka Support & Discussion / Rybka Discussion / Rybka 2.3.2a 64 2CPU greatly improved in CEGT 40/120

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