Stefan Pohl Computer Chess

Latest Website-News (2018/12/15): Testrun of Ethereal 11.12 finished. +15 Elo to Ethereal 11. Next testrun: Stockfish 181213. Result not before next Saturday. I deleted asmFish and asmBrainfish results out of the Stockfish-gamebase and ratinglist, because there is no more development of asmFish at the moment. The results can still be found in the full ratinglist of the HERT-archive-base.

Long thinking-time tournament updated - now 747 games played.

My Drawkiller Openings Project is finished. Never before any openings-set gave such low draw-rates without crunching the scores of the engines towards 50%, but instead pushing the scores away from 50%. The Drawkiller Normal- and Tournament sets nearly halve the draw-rate, compared to FEOBOS or the Stockfish Framework 8-move openings. I would never have expected, that this was possible – the Drawkiller project is really a breakthrough into another dimension of Computerchess. Learn more about Drawkiller openings in the "Drawkiller openings"- section on this website and download them here

Stay tuned.

Stockfish testing

Playing conditions:

Hardware: i7-6700HQ 2.6GHz Notebook (Skylake CPU), Windows 10 64bit, 8GB RAM

Fritzmark: singlecore: 5.3 / 2521 (all engines running on one core, only), average meganodes/s displayed by LittleBlitzerGUI: Houdini: 2.6 mn/s, Stockfish: 2.2 mn/s, Komodo: 2.0 mn/s

Hash: 512MB per engine

GUI: LittleBlitzerGUI (draw at 130 moves, resign at 400cp (for 4 moves))

Tablebases: None

Openings: HERT testset (by Thomas Zipproth) (download the file at the "Download & Links"-section or here)(I use a version of HERT, where the positions in the file are ordered in a different way - makes no difference for testing-results, dont be confused, when you download my gamebase-file and the game-sequence doesnt match with the sequence of your HERT-set...)

Ponder, Large Memory Pages & learning: Off

Thinking time: 180''+1000ms (= 3'+1'') per game/engine (average game-duration: around  7.5 minutes). One 5000 games-testrun takes about 7 days.The version-numbers of the Stockfish engines are the date of the latest patch, which was included in the Stockfish sourcecode, not the release-date of the engine-file, written backwards (year,month,day))(example: 170526 = May, 26, 2017). Since July, 2018 I use the abrok-compiles of Stockfish again (http://abrok.eu/stockfish), because they are now much faster than before - now only 1.3% slower than BrainFish-compiles. So, there is no reason anymore to not use these "official" development-compiles.

Download BrainFish (and the Cerebellum-Library): here

Each Stockfish-version plays 1000 games versus Komodo 12, Houdini 6, Fire 7.1, Ethereal 11.12, Komodo 12.2.2 MCTS. All engines are running with default-settings, except: Move Overhead is set to 300ms, if an engine allows to do so.

To avoid distortions in the Ordo Elo-calculation, from now, only 2x Stockfish (latest official release + the latest version) and 1x asmFish and 1x Brainfish are stored in the gamebase (all older engine-versions games will be deleted, every time, when a new version was tested). Stockfish, asmFish and BrainFish older Elo-results can still be seen in the Elo-diagrams below. BrainFish plays always with the latest Cerebellum-Library of course, because otherwise BrainFish = Stockfish.

Latest update: 2018/12/15: Ethereal 11.12

(Ordo-calculation fixed to Stockfish 10 = 3508 Elo)

See the individual statistics of engine-results here

Download the current gamebase here

Download the archive (all played games with HERT (308000 games)) here

See a ORDO-rating of the complete HERT-archive-base here

     Program                    Elo    +    -   Games   Score   Av.Op.  Draws

   1 BrainFish 180728 bmi2    : 3529    8    8  5000    77.8 %   3293   39.0 %
   2 Stockfish 10 181129      : 3508    7    7  6000    76.3 %   3292   40.6 %
   3 Stockfish 9 180201       : 3449    6    6  9000    75.4 %   3241   40.2 %
   4 Houdini 6 pext           : 3422    5    5 12000    66.3 %   3290   46.3 %
   5 Komodo 12 bmi2           : 3391    5    5 11000    61.5 %   3299   47.7 %
   6 Fire 7.1 popc            : 3277    4    4 12000    47.3 %   3302   50.2 %
   7 Ethereal 11.12 pext      : 3249    7    7  5000    35.2 %   3365   49.6 % (new)
   8 Komodo 12.2.2 MCTS       : 3224    5    5  9000    42.7 %   3286   44.5 %
   9 Shredder 13 x64          : 3186    6    6  9000    31.7 %   3342   41.0 %
  10 Fizbo 2 bmi2             : 3186    5    5 10000    36.8 %   3296   38.5 %
  11 Booot 6.3.1 popc         : 3175    6    6  7000    33.6 %   3305   44.0 %
  12 Xiphos 0.4.6 bmi2        : 3166    7    7  6000    30.1 %   3325   40.2 %
  13 Andscacs 0.94 popc       : 3136    6    6  7000    29.1 %   3305   38.1 %

The version-numbers (180622 for example) of the engines are the date of the latest patch, which was included in the Stockfish sourcecode, not the release-date of the engine-file. Especially the asmFish-engines are often released much later!!

Below you find a diagram of the progress of Stockfish in my tests since the end of 2018. 

And below that diagram, the older diagrams.

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).