Latest Website-News (2015/05/18): Testrun of Stockfish 150510 finished. +6 Elo to Stockfish 150503 and +22 Elo to Stockfish 6 (Stockfish 6 official binary is measureable faster, so it is around +5 Elo stronger at bullet-speed than the abrok.eu-compiles. That means, that Stockfish 150510 is around +27 Elo stronger at the same speed-level).Next testrun: Repeat the testrun of Stockfish 150510 with Contempt=+15. Some month ago, I did a experiment with Stockfish playing with different contempt-settings against Komodo 8 (see the "Experiments"-section), with really interesting results. The conclusion was, that even a small positive contempt reduces the high number of early 3-fold draws a lot, which seems to be a real weakness of Stockfish, without any Elo-loss (or perhaps a small Elo-gain?!?). Result not before next Sunday. Stay tuned! Endless RoundRobin tournament updated.
Stockfish testing Playing conditions: Hardware: i7-2630QM 2.0GHz Notebook, Windows 7 Home Premium 64bit, 4GB RAM
Fritzmark: singlecore: 3.97 / 1905 (all engines running on one core, only), average meganodes/s displayed by LittleBlitzerGUI: Houdini: 2.0 mn/s, Stockfish: 1.7 mn/s
Hash: 128MB per engine
GUI: LittleBlitzerGUI (draw at 120 moves, resign at 450cp (for 4 moves))
Tablebases: None
Openings: 10moves_SALC_500.epd (download the file at the "Download & Links"-section)
Ponder, Large Memory Pages & learning: Off
Thinking time:
70''+700ms per game/engine (average game-duration: 3.5 minutes)(standardized to the hardware-speed and the thinking time of the excellent
[You must be registered and logged in to see this link.]). One 7000 games-testrun takes about 6 days (running on only 3 of 4 cores). The version-numbers of the Stockfish-development engines are the release-date, written backwards (year,month,day))(example: 141028 = October, 28, 2014), downloaded at
[You must be registered and logged in to see this link.]. I always use the latest version of one day, if more than one version per day is released. And I use the version "for modern computers". Each Stockfish-version plays 1000 games against Komodo 9, Houdini 4, Gull 3, Fire 4, Critter 1.6a, Mars 3.35 and Equinox 3.3. Latest update: 2015/05/18: Stockfish 150510 Download the individual statistics [You must be registered and logged in to see this link.] Program Elo + - Games Score Av.Op. Draws
1 Stockfish 150510 x64 : 3268 6 6 7000 68.4 % 3133 38.1 %
2 Stockfish 150503 x64 : 3262 6 6 7000 67.6 % 3133 37.7 %
3 Stockfish 150410 x64 : 3259 6 6 7000 68.4 % 3127 38.1 %
4 Stockfish 150329 x64 : 3250 6 6 7000 67.3 % 3127 38.9 %
5 Stockfish 150314 x64 : 3248 6 6 7000 67.0 % 3127 39.1 %
6 Stockfish 150320 x64 : 3247 6 6 7000 67.0 % 3127 38.5 %
7 Stockfish 6 150128 : 3246 6 6 7000 66.9 % 3127 39.6 %
8 Stockfish 150307 x64 : 3245 6 6 7000 66.7 % 3127 39.1 %
9 Stockfish 150203 x64 : 3244 6 6 7000 66.6 % 3127 38.6 %
10 Stockfish 150220 x64 : 3244 6 6 7000 66.6 % 3127 39.2 %
11 Stockfish 150208 x64 : 3243 6 6 7000 66.4 % 3127 39.1 %
12 Komodo 9 x64 : 3241 6 6 8000 62.2 % 3153 38.4 %
13 Stockfish 150105 x64 : 3238 6 6 7000 65.8 % 3127 39.3 %
14 Stockfish 141221 x64 : 3227 6 6 7000 64.4 % 3127 39.7 %
15 Komodo 8 x64 : 3195 4 4 17000 48.7 % 3199 40.5 %
16 Houdini 4 x64 : 3180 3 3 20000 46.2 % 3208 38.0 %
17 Gull 3 x64 : 3119 4 4 20000 36.8 % 3211 40.9 %
18 Fire 4 x64 : 3112 4 4 20000 35.9 % 3212 41.0 %
19 Critter 1.6a x64 : 3102 4 4 20000 34.7 % 3212 39.0 %
20 Mars 3.35 x64 : 3090 4 4 20000 33.1 % 3213 38.4 %
21 Equinox 3.3 x64 : 3088 4 4 20000 32.8 % 3213 39.5 %
Below you find a diagram of the progress of Stockfish in my tests since the beginning of 2015. And below that diagram, the old diagram (May, 2013 - December, 2014). You can save the diagrams (as a JPG-picture (in originial size)) on your PC with mouseclick (right button) and then choose "save image"...The Elo-ratings of older Stockfish dev-versions in the Ordo-calculation can be a little different to the Elo-"dots" in the diagram, because the results/games of new Stockfish dev-versions - when getting part of the Ordo-calculation - can change the Elo-ratings of the opponent engines and that can change the Elo-ratings of older Stockfish dev-versions (in the Ordo-calculation / ratinglist, but not in the diagram, where all Elo-"dots" are the rating of one Stockfish dev-version at the moment, when the testrun of that Stockfish dev-version was finished). 
