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Up Topic Rybka Support & Discussion / Rybka Discussion / CCRL update (21st December 2007)
- - By Graham Banks (*****) Date 2007-12-22 09:19
The December 21st update of the CCRL Rating Lists and Statistics is now available for viewing at:

The list gets updated periodically during the week and these updates can be viewed here:
Please be aware that no game downloads are available from this live link.

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 92,628 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.

4CPU 64-bit Engines

Rybka 2.3.2a is over 50 ELO stronger than Zappa Mexico.
The update to Zappa Mexico seems to add little, if any strength.

Deep Shredder 11 lies 40 points further back in third spot.

Naum 2.2 comes in fourth, not too far behind Deep Shredder 11, but ahead of Deep Fritz 10.1 and Hiarcs 11.1.
Deep Fritz 10.1 is a 60 ELO improvement over Deep Fritz 10.
Hiarcs 11.1 is ahead of both Hiarcs 11.2 and Hiarcs 11.

The remaining well tested engines in order of rating are Loop M1-T, Glaurung 2.0.1, Deep Junior 10 and Deep Sjeng 2.7.
After 460 games, Glaurung 2.0.1 is currently 65+ ELO ahead of Glaurung 1.2.1.

2CPU Engines

With the emphasis of multi-cpu testing on 4CPU as opposed to 2CPU, there are still gaps in this category and some of the engines also require further games. However, the order of strength is almost identical to that described in the 4CPU notes.

Single CPU Engines

Rybka 2.3.2a is clearly a class apart at 120+ ELO ahead of Fritz 11, Shredder 11 and Zappa Mexico.

Toga II 1.3.1, Naum 2.2, Hiarcs 11.1, Loop M1-T and Fruit 2.3.1 are within a 25 ELO range of each other.
Fruit 2.3.1 and Fruit 051103 seem to be fairly even in strength despite their different playing styles.
Toga II 1.3.1 definitely seems to be stronger than Toga II 1.3.4.
Likewise, Hiarcs 11.1 seems to be stronger than Hiarcs 11.2.

A little further back again, Spike 1.2 Turin, Deep Sjeng 2.7, Glaurung 2.0.1 and Junior 10 are very close in strength.
Junior 10 seems to be stronger than Junior 10.1.

Bright 0.2c (private), Ktulu 8.0, SmarThink 1.00 and Chess Tiger 2007.1 are 40-50 ELO further back.

Chessmaster 11 is 40+ ELO stronger than CM10th Default and is also a little stronger than the best CM10th settings.

Movei 00.8.438 (10 10 10) and Alaric 707 are fairly closely matched in strength.
The Movei 00.8.438 (10 10 10) settings appear to be a little stronger than the default settings.

Scorpio 2.0 continues to be disappointing and lies 30+ ELO adrift of the previous version, around the same level as SlowChess Blitz WV2.1, Delfi 5.2, Ruffian 2.1.0, WildCat 7 and Gandalf 6.
Delfi 5.2 seems to be similar in strength to the earlier Delfi 5.1.

Free Single CPU Engines

Rybka 1.0 64-bit is still the top free engine ahead of Toga II 1.3.1.
Fruit 2.3.1 comes in third ahead of Spike 1.2 Turin and Glaurung 2.0.1.

Naum 2.0 is 40+ ELO further back, but with a good buffer over the group that includes Movei 00.8.438 (10 10 10) and Alaric 707.

SlowChess Blitz WV2.1, Delfi 5.2, Zappa 1.1, Scorpio 2.0 and WildCat 7 are closely grouped.

After 188 games, Pro Deo 1.6b remains behind Pro Deo 1.2.

Some other recent releases worthy of mention are:
Colossus 2007d - continues to go from strength to strength. This latest version is on a par with Pharaon 3.5.1.
BugChess2 1.5.2 - Francois has made astounding progress and this latest version is roughly the same strength as Booot 4.13.1, another engine that has made impressive gains.
Hamsters 0.6 - Alessandro has also made exceptional progress and this latest version is likely to be of a similar strength to those two engines just mentioned.
New engines Sloppy 0.1.1 and Cyrano 0.2d are ones 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 200+ games.


There are currently 215,078 games in our 40/4 database.

The 40/4 update is usually done separately to our 40/40 update.
The latest ratings can be found at one of the following links:

An enormous amount of work goes into the blitz list and it is well worth a visit.


There are currently 25,200 games in the FRC 40/4 database.

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 if they wish to see it tested.

Shredder 11 has now taken over second spot behind Rybka 2.3.2 FRC (private), an impressive 80 ELO ahead of Hiarcs 11.1 and Naum 2.2.

Ray has recently finished testing Glaurung 2.0.1 and it has made a 60 ELO gain over the previous version, slotting into seventh place on the pure list.

He has also just finished putting Hamsters 0.6 through its paces and it made a 60 ELO gain over the previous version.

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 lists of engines can be selected for comparison.

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.
Parent - - By M ANSARI (*****) Date 2007-12-22 09:27
Where did you get DF 10.1?  I have DF 10 and was not aware there is a 10.1 update.  Also Fritz 11 seems to be a huge improvement over Fritz 10 ... any idea when DF11 will come out?
Parent - By Graham Banks (*****) Date 2007-12-22 09:31
I'll have to get one of the testers who has DF10.1 to answer your question.
As for DF11, we know as much as anybody else does about it.   :-)

Regards, Graham.
Parent - By Lukas Cimiotti (Bronze) Date 2007-12-22 13:13
This is the link to the service pack that converts your DF10 to DF10.1:

Parent - By Luckybaer (**) Date 2007-12-22 13:29
There's a service pack that updates the DF10 engine.  When you run it, it will not change the engine name - like the Junior 10.1 update did.  I think people are using a hex editor or simply name changing in databases to get the "10.1" moniker.  I have heard that the 10.1 version works with 4-cores better than the predecessor.
Up Topic Rybka Support & Discussion / Rybka Discussion / CCRL update (21st December 2007)

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