Stefan Pohl Computer Chess

Latest Website-News (2020/09/28): AB-testrun of Ethereal 11.62 finished: +34 Elo to Ethereal 12.50. Wow!

Because I need my machines for some experiments and work on my new openings-project, the testruns are suspended until next weekend. Next Stockfish-testrun should (hopefully) start on Sunday. Sorry for the delay.

Stay tuned.

Stockfish testing

Playing conditions:

Hardware: Since 20/07/21 AMD Ryzen 3900 12-core (24 threads) notebook with 32GB RAM. Now, 20 games are played simultaneously (!), so from now, each testrun will have 6000 or 7000 games (instead of 5000 before) and will take only 2 days, not 6-7 days as before! From now, all engine-binaries are popcount/avx2, of course, because bmi2-compiles are extremly slow on AMD. To keep the rating-list engine-names consistent, the "bmi2"- or "pext"-extension in the engine-name is still in use for older engines - otherwise ORDO will not calculate all played games by this engine as one engine...

Speed: (singlethread, TurboBoost-mode switched off, chess starting position) Stockfish: 1.3 mn/s, Komodo: 1.1 mn/s

Hash: 256MB per engine

GUI: Cutechess-cli (GUI ends game, when a 5-piece endgame is on the board)

Tablebases: None for engines, 5 Syzygy for cutechess-cli

Openings: HERT_500 testset (by Thomas Zipproth) (download the file at the "Download & Links"-section or here)

Ponder, Large Memory Pages & learning: Off

Thinking time: 180''+1000ms (= 3'+1'') per game/engine (average game-duration: around  7.5 minutes). One 7000 games-testrun takes about 2 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: 200807 = August, 7, 2020). Since Stockfish supports NNUE, the engine-name is "SF" ("BF"= BrainFish), only, because the engine-name has to include not only the release-date, but the name of the nnue-net, too, which makes the complete engine-name very long! And the used SF compile is the AVX2-compile, which is the fastest on my AMD Ryzen CPU.

Download BrainFish (and the Cerebellum-Libraries): here

To avoid distortions in the Ordo Elo-calculation, from now, only 3x Stockfish (latest official release + the latest 2 dev-versions) 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 and BrainFish older Elo-results can still be seen in the Elo-diagrams below. BrainFish plays always with the latest Cerebellum-Libraries of course, because otherwise BrainFish = Stockfish.

Latest update: 2020/09/28: Ethereal 12.62  (+34 Elo to Ethereal 12.50)

(Ordo-calculation fixed to Stockfish 12 = 3684 Elo)

See the individual statistics of engine-results here

See the ORDO-rating of the archive-gamebase since 2020 here

Download the current gamebase here

Download the archive-gamebase since 2020 here

     Program                    Elo    +    -   Games   Score   Av.Op.  Draws

   1 CFish 12 3xCerebellum    : 3720    8    8  7000    86.1 %   3383   27.3 %
   2 Stockfish 200921 avx2    : 3707    8    8  7000    82.6 %   3405   32.5 %
   3 Stockfish 200915 avx2    : 3703    8    8  7000    82.3 %   3405   33.0 %
   4 CFish 12 avx2            : 3698    8    8  7000    84.6 %   3383   29.1 %
   5 Stockfish 12 200902      : 3684    6    6 13000    79.1 %   3421   38.0 %
   6 BrainFish-2 200724       : 3639    8    8  7000    84.1 %   3339   31.0 %
   7 Stockfish 200731 popc    : 3595    7    7  7000    80.5 %   3339   36.2 %
   8 Stockfish 11 200118      : 3559    4    4 17000    69.5 %   3397   41.6 %
   9 Stockfish 10 181129      : 3519    5    5 15000    78.5 %   3282   37.7 %
  10 Stockfish 9 180201       : 3469    8    8  5000    74.9 %   3267   41.7 %
  11 Komodo 14 bmi2           : 3440    4    4 19000    47.3 %   3467   49.2 %
  12 Houdini 6 pext           : 3435    3    3 40000    58.2 %   3374   45.8 %
  13 Komodo 13.3 bmi2         : 3432    6    6  8000    62.8 %   3336   49.9 %
  14 Komodo 13.1 bmi2         : 3419    6    6 11000    62.0 %   3328   48.8 %
  15 Komodo 12.3 bmi2         : 3406    7    7  7000    62.7 %   3308   49.4 %
  16 Ethereal 12.62 avx2      : 3384    6    6  7000    49.9 %   3391   54.0 %
  17 Ethereal 12.50 popc      : 3350    5    5 10000    39.9 %   3446   49.0 %
  18 Slow Chess 2.3 popc      : 3337    5    5 12000    39.7 %   3432   48.3 %
  19 Komodo 14 MCTS           : 3334    7    7  5000    44.4 %   3379   53.4 %
  20 Ethereal 12.25 pext      : 3331    5    5 13000    33.5 %   3479   44.9 %
  21 Slow Chess 2.2 popc      : 3324    5    5 12000    31.3 %   3491   41.5 %
  22 Ethereal 12.00 pext      : 3311    6    6  9000    43.1 %   3365   50.8 %
  23 Igel 2.8.0 popavx2       : 3308    7    7  7000    38.3 %   3405   48.2 %
  24 Ethereal 11.75 pext      : 3302    6    6  9000    39.3 %   3386   53.2 %
  25 Xiphos 0.6 bmi2          : 3297    3    3 27000    34.5 %   3435   46.7 %
  26 Fire 7.1 popc            : 3294    3    3 40000    41.0 %   3378   48.9 %
  27 Xiphos 0.5.6 bmi2        : 3282    6    6  7000    41.2 %   3350   54.6 %
  28 Ethereal 11.53 pext      : 3275    6    6  7000    42.2 %   3336   53.4 %
  29 Komodo 12.3 MCTS         : 3270    7    7  7000    42.7 %   3328   46.3 %
  30 Ethereal 11.25 pext      : 3265    7    7  6000    38.4 %   3356   51.0 %
  31 rofChade 2.3 bmi2        : 3252    5    5 12000    31.9 %   3403   45.4 %
  32 Booot 6.4 popc           : 3238    7    7  6000    31.1 %   3388   46.5 %
  33 Schooner 2.2 popc        : 3235    7    7  6000    31.3 %   3384   50.3 %
  34 Laser 1.7 bmi2           : 3212    8    8  6000    30.8 %   3365   45.8 %
  35 Fizbo 2 bmi2             : 3207    8    8  5000    36.0 %   3319   39.0 %
  36 Fritz 17                 : 3206    7    7  6000    29.4 %   3371   44.2 %
  37 Shredder 13 x64          : 3204    8    8  6000    31.9 %   3353   42.6 %
  38 RubiChess 1.8 popc       : 3202    6    6  7000    32.0 %   3339   46.1 %
  39 Defenchess 2.2 popc      : 3199    8    8  5000    26.6 %   3388   41.8 %
  40 Booot 6.3.1 popc         : 3194    8    8  5000    34.0 %   3322   44.1 %
  41 Andscacs 0.95 popc       : 3162    9    9  5000    23.1 %   3385   35.4 %

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 August 2020. 

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).