The purpose of our rating lists is provide engine authors and enthusiasts with a general comparison of engine strength. We also provide other data that could be of interest.
For various reasons, there may be some engines that do not appear on our lists, therefore it is useful to look at other rating lists as well as ours.
The inclusion or exclusion of engines in our lists should not be taken as our group making a statement about their legality or status. However, where there is controversy surrounding an engine in our lists, we have indicated this.
We test chess engines for our own enjoyment and receive no payment for doing so.

The latest CCRL Rating Lists and Statistics are available for viewing from the following links:
http://computerchess.org.uk/ccrl/4040.live/ (40/40)
http://www.computerchess.org.uk/ccrl/404.live/ (40/4)
http://www.computerchess.org.uk/ccrl/404FRC/ (FRC 40/4)

Please note that the three lists are often updated separately to each other.
The links given in each update report will give you the currently up to date lists.

The links to the various rating lists can be found just beneath the default Best Versions list (as in this screenshot). Specific 32-bit rating lists are denoted as such to the right of the default list in each category. The default lists contain the 64-bit engines.



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

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.

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, but you will need to remove the .live from the links if you wish to access these (for example http://computerchess.org.uk/ccrl/4040 ). The download databases by month or ECO code are only updated monthly, but the total games database in its entirety is always available.
The current ELO ratings are 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.


40/40 games submitted this week
Alex 2.14a 32-bit -> 20
AliChess 4.25 -> 22
Anechka 0.08 -> 12
Ant 2006-F -> 12
Arasan 12.1 32-bit -> 6
Arasan 13.2 32-bit -> 49
Ares 1.004 -> 20
Atak 6.8 -> 34
Atlas 3.14b 32-bit -> 20
Bagatur 1.2a 32-bit -> 12
Beowulf 2.4a 32-bit -> 34
Betsabe II 1.08c -> 34
Bison 9.6 -> 4
Booot 4.13.0 -> 4
Booot 5.1.0 -> 31
Bright 0.2c -> 10
Bright 0.4a -> 4
Bright 0.5c -> 10
Brutus 7.02b -> 8
BugChess2 1.5.1 -> 6
Butcher 1.61 32-bit -> 22
Cerebro 3.03d -> 10
Chaturanga 2.4.3 -> 32
Cheng3 1.05 32-bit -> 54
Chesley r323 -> 22
Chess Tiger 2007 -> 6
Chessmaster 11 -> 8
Chessmaster 11 Conqueror -> 16
Chessmaster 11 Toxic -> 12
Chiron 1.1 32-bit -> 209
Counter 1.2 -> 10
Crafty 23.1 32-bit -> 4
Critter 1.2 32-bit -> 16
Critter 1.2 64-bit SSE -> 32
CuckooChess 1.10 -> 6
Deep Junior 11.1a 32-bit 1CPU -> 4
Deep Junior 12.5 32-bit 1CPU -> 26
Deep Sjeng c't 2010 -> 16
Delphil 2.8 -> 10
Dirty 6J-22 -> 6
Dolphin 1.0 -> 34
Dorky 4.3 32-bit -> 20
EveAnn 1.66 -> 12
FireFly 2.5.13 32-bit -> 34
Francesca MAD 0.19 -> 15
Frenzee 3.0 -> 4
Fritz 13 -> 144
GarboChess 3.0 32-bit -> 10
Gaviota 0.84 32-bit -> 52
Ghost 2.0.1 -> 20
Gibbon 2.52a -> 12
GreKo 8.2 32-bit -> 10
Green Light Chess 3.01.2.2 -> 10
Gull 1.0a 32-bit -> 18
Gull 1.2 32-bit -> 14
Hannibal 1.1 32-bit -> 24
Hermann 2.8 32-bit -> 10
Hiarcs 13.2 -> 74
Hiarcs X54 Hypermodern 32-bit -> 4
Houdini 1.5a 32-bit -> 8
Houdini 2.0 32-bit -> 17
Hussar 0.4 -> 10
Ifrit m1.5 -> 20
Jazz 501 32-bit -> 12
Jonny 4.00 -> 10
KMTChess 1.2.1 32-bit -> 13
KnockOut 0.7.1 -> 12
Komodo 3 32-bit -> 15
Ktulu 8 -> 5
LittleThought 1.052 32-bit -> 10
Loop 12.32 -> 4
Myrddin 0.85 32-bit -> 12
N2 0.1 -> 6
NanoSzachy 3.9 -> 8
Naraku 1.4 -> 12
Naum 1.91 32-bit -> 10
Naum 4.2 32-bit -> 16
OliThink 5.3.0 -> 22
Onno 1.0 32-bit -> 4
Onno 1.2.70 32-bit -> 10
Pepito 1.59 32-bit -> 10
Plisk 0.2.7d 32-bit -> 20
Popochin 3.2 -> 12
Protector 1.4.0 32-bit -> 19
Pupsi2 0.08 -> 10
Quark 2.35 -> 10
Quazar 0.21 32-bit -> 1
RattateChess 1.0 Nosferatu -> 22
Rodin 4.0 -> 3
Rybka 2.3.2a 32-bit -> 8
Rybka 4.1 32-bit -> 16
Scorpio 1.91 -> 6
Scorpio 2.0 -> 4
Scorpio 2.6 32-bit -> 6
Shredder 10 32-bit -> 4
Shredder 12 32-bit OA Off -> 10
Shredder 12 32-bit OA On -> 14
Simplex 0.9.7 32-bit -> 20
Sjakk 1.1.8 -> 22
Slow Chess Blitz WV2 -> 6
SmarThink 1.00 32-bit -> 4
Spark 1.0 32-bit -> 19
SpiderChess 070603 -> 10
Spike 1.4 Leiden -> 15
Stockfish 2.1.1 32-bit -> 15
Stockfish 2.1.1 64-bit -> 50
Sungorus 1.4 32-bit -> 20
TJchess 1.01 -> 20
Tao 5.6 -> 10
The Baron 2.23 32-bit -> 4
Thinker 4.7a -> 4
Thinker 5.4D Inert 32-bit -> 20
Toga II 1.2 32-bit -> 4
Toga II 3.1.2SE -> 10
Tornado 2.2 -> 14
Tornado 4.82 32-bit -> 51
Trace 1.37a -> 10
Twisted Logic 0.085 -> 6
Twisted Logic 0.099x -> 4
Umko 1.2 32-bit -> 13
Waxman 2010 -> 22
Yace 0.99.87 -> 10
Zappa Mexico II 32-bit -> 10
iCE 0.2 -> 20


40/4 games submitted this week
Abrok 5.0 -> 29
Aice 0.99.2 -> 34
Alaric 707 -> 32
Alarm 0.93.1 -> 66
Alfil 8.1.1 Optimized -> 95
Amyan 1.72 -> 32
AnMon 5.75 -> 63
Anechka 0.08 -> 34
Ant 2006-F -> 34
Arion 1.7 -> 33
Aristarch 4.50 -> 32
Asterisk 0.6 -> 34
Atak 6.8 -> 32
Atlas 2.20 -> 34
Averno 0.81 -> 34
Ayito 0.2.994 -> 34
BamBam -> 29
Beowulf 2.4a 32-bit -> 32
Bison 9.11 64-bit -> 61
BlackBishop 1.0 -> 32
Booot 5.1.0 -> 33
Bright 0.5c -> 62
Brutus 8.05 64-bit -> 32
BugChess2 1.9 64-bit -> 32
Cerebro 3.03d -> 32
Cheng3 1.03 64-bit -> 32
ChessMind 0.82 -> 630
Chezzz 1.0.3 -> 34
Chiron 1.1 64-bit -> 530
Chispa 4.0.3 -> 66
Chronos 1.9.9 64-bit -> 64
Clueless V1.4 -> 32
Colossus 2008b -> 95
Comet B50 -> 31
Crafty 23.4 64-bit -> 64
Critter 1.2 64-bit -> 32
CyberPagno 2.1 -> 34
Cyrano 06b17 64-bit -> 64
DanaSah 4.24 -> 32
DanaSah 4.66 -> 771
Daydreamer 1.75 64-bit -> 64
Deep Junior 12.5 64-bit -> 32
Deep Shredder 12 64-bit OA On 1CPU -> 32
Deep Sjeng 3.0 64-bit 1CPU -> 32
Delfi 5.4 -> 64
Deuterium 11.01.28.159 -> 1048
Dorky 3.48 -> 34
Dragon 4.6 -> 32
E.T. Chess 13.01.08 -> 64
EXchess 5.01b 64-bit -> 34
Eeyore 1.48 -> 34
Esc 1.16 -> 34
Firefly 2.5.8 64-bit -> 32
Fortress 1.62 -> 66
Francesca MAD 0.15 -> 31
Frenzee 3.5.19 64-bit -> 63
Fritz 13 -> 210
Gaia 3.5 64-bit -> 31
GarboChess 2.20 64-bit -> 64
Genesis 2.0 -> 99
Glass 1.6 -> 32
Green Light Chess 3.01.2.2 -> 64
Gull 1.0a 64-bit -> 26
Gull 1.2 64-bit -> 32
Hamsters 0.71 -> 64
Hannibal 1.1 64-bit -> 61
Heracles 0.6.16 -> 30
Hermann 2.6 64-bit -> 1084
Hermann 2.8 64-bit -> 31
Hiarcs 13.2 -> 32
InmiChess3.06N -> 66
Jonny 4.00 -> 64
King of Kings 2.56 -> 32
Kiwi 0.6d 64-bit -> 32
KnightX 1.92 -> 34
Komodo 3 64-bit -> 32
Ktulu 4.2 -> 29
Latista (Sinobyl) 1.5 -> 34
Lime 66 -> 32
Little Goliath Evolution 3.12 -> 95
Loop 13.6 (Loop 2007) 64-bit -> 47
Madeleine 0.2 -> 34
Matilde 2008 64-bit -> 34
Movei 00.8.438 (10 10 10) -> 64
N2 0.4 64-bit -> 64
NagaSkaki 5.12 -> 34
Naraku 1.31 -> 32
Natwarlal 0.14 -> 34
Naum 2.0 32-bit -> 64
Naum 4.2 64-bit -> 32
Nejmet 3.07 -> 64
Nesik 0.7.0 alpha -> 64
Onno 1.2.70 64-bit -> 32
Pepito 1.59 32-bit -> 32
Pepito 1.59.2 64-bit -> 541
Petir 4.39 -> 31
Petir 4.999999 -> 32
Pharaon 3.5.1 -> 32
Philou 3.60 -> 59
Popochin 3.2 -> 1215
Pro Deo 1.6 -> 32
Pseudo 0.7c -> 61
Quark 2.35 -> 32
RedQueen 1.0.0 64-bit -> 31
Resp 0.19 64-bit JA Nobook -> 96
Rival 1.18 -> 32
Rodin 4.0 -> 32
RomiChess P3k 64-bit -> 32
Rotor 0.6 -> 95
Ruffian 1.0.5 -> 32
Rybka 4.1 64-bit -> 32
SOS 5.1 -> 28
Scidlet 3.61 x64 JA -> 34
Scorpio 2.7 64-bit -> 32
Sjakk 1.1.8 -> 32
Sloppy 0.2.2 64-bit -> 64
Slow Chess Blitz WV2.1 -> 94
SmarThink 0.17a -> 32
Smash 1.0.3 -> 32
Snitch 1.6.2 32-bit -> 32
Spark 1.0 64-bit -> 31
SpiderChess 070603 -> 64
Spike 1.4 Leiden -> 32
Stockfish 2.1.1 64-bit -> 32
Sunsetter 10.3 64-bit -> 34
Tao 5.6 -> 64
The Baron 2.23 64-bit -> 95
Thinker 5.4d Inert 64-bit -> 32
Thor's Hammer 2.28 32-bit -> 33
Trace 1.37a -> 95
Twisted Logic 20090922 64-bit -> 32
Ufim 8.02 -> 96
Uralochka 1.1b -> 66
WJChess 1.64 -> 66
Warrior 1.0.3 -> 30
WildCat 8 -> 64
Yace 0.99.87 -> 92
Zappa 1.1 64-bit -> 31
Zappa Mexico II 64-bit -> 30
Zeus 1.29 -> 33