Not logged inRybka Chess Community Forum
Up Topic Rybka Support & Discussion / Rybka Discussion / CCRL update (21st July 2007)
- By Graham Banks (*****) Date 2007-07-21 21:27
The July 21st update of the CCRL Rating Lists and Statistics is now available for viewing at:

The links to the various rating lists can be found just beneath the default Best Versions list.
For example there is a 32-bit Single CPU list.

Our standard testing is at 40 moves in 40 minutes repeating while our current blitz testing is at both 40 moves in 4 minutes repeating and 40 moves in 12 minutes repeating, all adjusted to the AMD64 X2 4600+ (2.4GHz).

Currently active testers in our team are:
Graham Banks, Ray Banks, Shaun Brewer, Kirill Kryukov, Dom Leste, Tom Logan, Andreas Schwartmann, Charles Smith, George Speight, Chris Taylor, Chuck Wilson, Gabor Szots and Martin Thoresen.

A big thanks to all testers as usual for their efforts this week.

40/40 NOTES

There currently 67,099 games in our 40/40 database.

Many engines on our list have few games and in many cases their ratings are likely to fluctuate (markedly for some) until a lot more games are played. Therefore no conclusions should be drawn about their strength yet.
To illustrate this point, when an engine has 200 games played, the error margin is still approximately +/-40 ELO, after 500 games +-25 ELO, after 1000 games +-17 ELO and even after 2000 games there is a +-13 ELO error margin!
This of course highlights the importance of looking at other rating lists that are also available in order to draw comparisons and get a more accurate overall picture.

Multi CPU Engines

Rybka 2.3.2 64-bit 4CPU  continues to hold a tiny lead over Rybka 2.2 64-bit 4CPU.

Zap!Chess Zanzibar 64-bit 4CPU is clearly number 2 ahead of Hiarcs 11.1 4CPU.
Naum 2.1 64-bit 4CPU and Loop M1-T 64-bit 4CPU aren't far behind.

Deep Shredder 10 64-bit 4CPU, Deep Fritz 10 4CPU and Deep Junior 10 4CPU, are off the pace.

Single CPU Engines

Rybka 2.3.2 leads the ratings here as well, although by a slightly larger margin.

Now included in our list for your interest are the three candidates for the final release of Toga II 1.3. It would appear that the released version will be at least on a par at longer time controls with Zap!Chess Zanzibar and Hiarcs 11.1!

Loop 13.6, Fritz 10 and Shredder 10 are the next three in the ranking order.

There has been controversy regarding our continued testing of the Strelka versions.
Many of you will find the ponder hit comparisons with Rybka 1.0 highly interesting (I would refer you to our 40/4 stats in particular).
Whereas Strelka 1.0b is weaker than Rybka 1.0, we are only in the early stages of testing Strelka 1.8 at 40/40.
Whatever your views may be on Strelka (and there are even differing views amongst the CCRL testers), we felt that such testing was necessary to help add to the picture.

Spike 1.2 Turin, Junior 10, Naum 2.1, Fruit 2.2.1 and Deep Sjeng 2.5 are the next closely matched group of engines.

Ktulu 8.0 and Chess Tiger 2007.1 are further adrift.

Amateur News

The final release of Toga II 1.3 will rival Rybka 1.0 as the strongest free engine.

Strelka 1.0b is a little stronger than Spike 1.2 Turin.

Glaurung 2 epsilon/5 is the strongest version that Tord has released to date.

Although we've just started testing Alaric 707, it is expected to be stronger than the next group of engines - Scorpio 1.91, Delfi 5.1 and SlowChess Blitz WV2.1.

WildCat 7 and Pro Deo 1.2 are further back.

Further down the list, it should be noted that the most recent versions of Booot, Ufim, DanaSah, Delphil, Natwarlal, Buzz and Feuerstein seem to have made good gains over previous versions.
The new NanoSzachy is also one to keep an eye on.

We test a very extensive range of amateur engines through our Amateur Championship divisions (32-bit 1CPU) plus other tournaments, all of which can be followed in our public forum.

Our aim is of course to ensure that all engines lower on our lists get at least 200 games.


There are currently 153,213 games in our 40/4 database.

The 40/4 update is usually done separately to our 40/40 update. The most recent update can always be viewed here:


Ray tests only those engines that can play FRC through the Shredder Classic GUI.
If engine authors have a new and stable version of their engine that will run under this GUI, they should contact Ray to get it tested.

For FRC the best list to look at is the pure list.


The LOS stats to the right hand side of each rating list are "likelihood of superiority" stats. They tell you the likelihood in percentage terms of each engine being superior to the engine directly below them.

A list of games played this week per engine can be found in the update thread in the CCRL public forum, accessible through the link given at the top of this post.

All games are available for download through the link given at the top of this post. They can be downloaded by engine or by month.
ELO ratings are now saved in all game databases for those engines that have 200 games or more.

Clicking on an engine name will give details as to opponents played plus homepage links where applicable.

Custom list selections now have the option of including or excluding betas, private engines, settings and others.

An openings report page (link at bottom of index page) lists the number of games played by ECO codes with draw percentage and White win percentage. Clicking on a column heading will sort the list by that column.
Games can now be downloaded by ECO code.
Up Topic Rybka Support & Discussion / Rybka Discussion / CCRL update (21st July 2007)

Powered by mwForum 2.27.4 © 1999-2012 Markus Wichitill