CCRL update (27th February 2009)

[Graham Banks]

The latest updates of the CCRL Rating Lists and Statistics are available for viewing at:
http://www.computerchess.org.uk/ccrl/4040/ (40/40)
http://computerchess.org.uk/ccrl/404/ (40/4)
The live link to the 40/4 list given below is currently the most up to date for that list.

The lists sometimes get updated during the week and these updates can be viewed here:
http://www.computerchess.org.uk/ccrl/4040.live/ (40/40)
http://computerchess.org.uk/ccrl/404.live/ (40/4)
However, no game downloads are available from these live links.

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 40 moves in 40 minutes repeating and 40 moves in 4 minutes repeating are both adjusted to the AMD64 X2 4600+ (2.4GHz).

Currently active testers are:
Graham Banks, Ray Banks (FRC only), Shaun Brewer, Kirill Kryukov, Dom Leste, Tom Logan, Denis Mendoza, Wassim Saeed, Charles Smith, George Speight and Gabor Szots.

Be aware that in the early stages of testing, an engine's rating can often fluctuate a lot.
It is strongly advised to look at the many other rating lists available in order to get a more accurate overall picture of an engine's rating relative to others.


40/40 Notes

There are currently over 169,000 games in our 40/40 database.


4CPU 64-bit Engines

Rybka 3 is clearly stronger than second placed Naum 4, which in turn is clearly stronger than third placed Deep Fritz 11.
Zappa Mexico II isn't too far back in fourth, but then there is another meaningful gap back to Deep Sjeng WC2008 and Deep Shredder 11.
Thinker 5.4a Inert, Toga II 1.4.1SE, Hiarcs 12, Bright 0.4a (private) and Glaurung 2.2 come in next and are very evenly matched in strength.
None of the many strong Toga derivatives have been tested in this category.

The relative ratings of the 2CPU engines that have been well tested are pretty much the same as their 4CPU counterparts.


Single CPU Engines

A similar situation exists at the top in this category with Rybka 3 holding a huge lead over second placed Naum 4, which in turn has a huge lead over the evenly matched Zappa Mexico II and Fritz 11.
Grapefruit 1.0, Thinker 5.4a Inert, Deep Sjeng WC2008, Shredder 11, Cyclone 3.4 and Toga II 1.4.1SE aren't too far back and are also very close in strength to each other.
Hiarcs 12.1 and TheMadPrune 1.1.25 come in next, ahead of Stockfish 1.2, Fruit 2.3.1, Loop 13.6 and Bright 0.4a (private).


Free Single CPU Engines

Rybka 2.2n2 holds onto its spot as the top free engine, a good distance ahead of the chasing pack that includes Grapefruit 1.0, Thinker 5.4a, Cyclone 3.4 and Toga II 1.4.1SE.
TheMadPrune 1.1.25 comes in next, narrowly ahead of Stockfish 1.2, Fruit 2.3.1 and Glaurung 2.2.
Spike 1.2 Turin and Bright 0.3a are further back.
Twisted Logic 20080620, Crafty 22.10, Booot 4.15.0, Frenzee Feb08 and Delfi 5.4 are the next group of evenly matched engines. Crafty 22.10 still needs more games, but it seems likely that this version will live up to the claims of having reached or passed Fruit 2.1.

CCRL tests a wide range of free engines, ranging right down to the 2000 elo level. The intention is to get well over 200 games for each of these engines.
Tournaments involving these engines can be followed in our public forum.


Blitz Notes

There are now well over 413,000 games in the 40/4 database and it is well worth a visit.
Shaun, Gabor, Kirill, Denis and Dom put a lot of work into this list.


FRC Notes

Ray currently restricts his testing to FRC only.
Thanks to the much appreciated efforts of Matthias Gemuh, ChessGUI is now able to be used to test all FRC engines, both Winboard/UCI plus Shredder/Arena specific.

There are currently 43,000 games in the database.

Rybka 3 has a big lead over Naum 4, which in turn has a similarly big lead over the evenly matched Shredder 11 and Deep Sjeng WC2008.
Hiarcs 12.1 comes in next, comfortably ahead of Glaurung 2.2.

For FRC the best list to look at is the pure list.
http://www.computerchess.org.uk/ccrl/404FRC/


Stats/Presentation Notes

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

All games are available for download by engine, by month or by ECO code.
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 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.

An exciting new development coming soon will be the optional inclusion of engine logos, flags and continent pictures beside each engine name in the rating lists.
An example of what this will look can be seen here in Kirill's special free engines project - KCEC site
The engine logo will function as a link to selection of all engines from the same family. The country flag will be a link to selection of all engines from the same country. The continent picture is a link to selection of all engines from the same continent.