Please note that because we are still experiencing problems with our main site, the March 10th update of the CCRL Rating Lists and Statistics is available for viewing at:
http://ccrlchess.org.uk/ccrl/4040/index.html

The links to the various rating lists can be found just beneath the default Best Versions 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).

Our team of testers currently includes:
Graham Banks, Ray Banks, Sarah Bird, Shaun Brewer, Kirill Kryukov, Dom Leste, Tom Logan, Andreas Schwartmann, Joshua Shriver, Charles Smith, George Speight, Chris Taylor, Martin Thoresen, Chuck Wilson and Gabor Szots.

We remain on the lookout for a few more reliable, trustworthy and known testers to help, so please contact one of us if you're interested.

40/40 Notes

972 games were added to our 40/40 database this week, taking us past the 50,000 game mark!
A big thanks to all testers as usual.

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 has been removed from our testing and we will wait for Rybka 2.3.2 to be released.

Rybka 2.2 64 bit 4CPU therefore still heads the rating list at around 3100 ELO.

Zap!Chess Zanzibar 64 bit 4CPU is a clear second on around 3035 ELO.

Hiarcs 11.1 4CPU tests 20 points stronger than Hiarcs 11 after 186 games.
However, at around 2980 ELO, it is still well behind Zap!Chess Zanzibar 64 bit 4CPU at this stage.

Naum 2.1 64-bit 4CPU comes in next with a rating of about 2950 ELO after its first 100 games.

LoopMP 12.32 2CPU and Deep Shredder 10 64 bit 4CPU at around 2925 ELO are slightly ahead of Deep Fritz 10 4CPU and Deep Junior 10 4CPU at around 2915 ELO.

Single CPU Engines
Due to the removal of Rybka 2.3 from our testing, Rybka 2.2 64 bit still tops this list at around 3010 ELO.

Hiarcs 11.1 lies in second spot on 2910 ELO, but with only 62 games played to date, this rating is not yet reliable.

Zap!Chess Zanzibar 32 bit is in third spot on 2880 ELO, not too far ahead of Fritz 10, Shredder 10 and Loop 10.32f on about 2875 ELO.

Toga II 1.2.1a is little further back on 2862 ELO.
We won't be testing Toga II 1.3 until the egbb access bug has been addressed.

Spike 1.2 Turin, Naum 2.1 32 bit, Fruit 2.2.1 and Junior 10 are closely grouped at around 2840-2850 ELO.

Ktulu 8.0 and Chess Tiger 2007 are around the 2800 ELO mark.
Scorpio 1.91 isn't likely to be too far behind based on what we've seen so far.

3rd CCRL Amateur Championship (32-bit 1CPU):
Division 1 - Scorpio 1.91 took the crown on tiebreak from Spike 1.2 Turin.
Division 2 - Frenzee 3.0, Crafty 21.5 and E.T Chess 18.11.05 earned promotion while AnMon 5.60, Gosu 0.16 and Djinn 0.925x finished in the relegation zone.
Division 3 - Tytan 9.3 and Post Modernist 1016 have been added into this division.
Alfil 7.3 will also replace Alfil 6.10, so there could well be changes in the promotion and relegation spots.
Division 4 - With 9 of 30 rounds played, Ayito 0.2.994 has a narrow lead over the chasing pack which includes Homer 2.0, KnightX 1.92, EXchess 5.01b and Little Thought 1.00.
Division 5 - the field is still being finalised and will be posted soon.

The amateur engines lower in our list are steadily getting more games. Our aim is that every engine in our list gets 150-200 games at least.

We have a number of tournaments in progress and most of these can also be followed in our public forum.

Blitz Notes

The 40/4 and 40/12 lists are updated separately.
The 40/4 list is in superb shape now and the latest live list can be viewed here once our main site is up again:
http://ccrlchess.org.uk/ccrl/404.live/

Work continues on improving the 40/12 list.

FRC Notes

Ray tests only those engines that can play FRC through the Shredder Classic GUI.

Hiarcs 11.1 has taken over top spot, pushing Shredder 10 back into second spot.

Loop 10.32f is in third place.

Spike 1.2 Turin and Fruit 2.2.1 are neck and neck in the 4th and 5th spots.

Stats/Presentation Notes

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.

All games are also 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 150 games or more.

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.

There is now also a live update link posted in our public forum.
We usually update our lists several times each week for our own interest.
Up until recently, these live updates have been private, but they're now also available to you.