Stefan Pohl Computer Chess

Latest Website-News (2025/03/30): Stockfish 17.1 released.

 

Testrun of PlentyChess 5.0 finished: +23 Celo to PlentyChess 4.0. PlentyChess 5.0 passed Alexandria 8, and PlentyChess 5 missed only 7.5 points (out of 15000 games (!)) to catch up new Berserk 250307 dev.

 

Ceres Binary here, Ceres Installation Guide here, Ceres Nets here

 

Dont forget to take a look at my EAS-Ratinglist (The world's first engine-ratinglist not measuring strength of engines, but engines's style of play)

 

Ed Schroeder provided me a dev-version of Rebel Extreme (E145), which is now participating in my Super 3 Tournament. It replaces Patricia 250120 as the Gueststar of the tournament.

 

Next testrun: Stockfish 17.1

 

Stay tuned

UHO-Top15 Engines Ratinglist (+ regular testing of Stockfish Dev-versions)

 

 

Playing conditions:

 

The 15 strongest engines and the latest StockfishDev version are playing 1000 games vs. each opponent: 15000 games per engine are played. A RoundRobin Tournament with 120000 games overall !

 

Hardware: AMD Ryzen 9 7945HX 16-core (32 threads) notebook with 64GB RAM (since 2024/10/08), 2 identical machines. Windows 11 64bit

Speed: (singlethread, TurboBoost-mode switched off, chess starting position) Stockfish 17: 600 kn/s (when 26 games are running simultaneously)

Hash: 512MB per engine

GUI: Cutechess-cli (GUI ends game, when a 5-piece endgame is on the board, all other games are played until mate or draw by chess-rules (3fold, 50-moves, stalemate))

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

Openings: My UHO_2022_6mvs_+120_+129 openings are used (first 500 lines) (UHO 2022 openings are part of my Anti Draw Openings download-package). 

Ponder, Large Memory Pages & learning: Off

Thinking time: 3min+1sec per game/engine. One testrun (15000 games) takes around 80-85 hours (=3.5 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). The used SF compile is the AVX512-compile, which is the fastest on my AMD Ryzen CPU. SF binaries are taken from https://github.com/official-stockfish/Stockfish/releases (except the official SF-release versions, which are taken form the official Stockfish website).

Read the explanation, why I chose my testing-conditions, like I did here

 

Latest update: 2025/03/28: PlentyChess 5.0 (+23 Celo to PlentyChess 4.0)

 

(Ordo-calculation fixed to Stockfish 17 = 3843 Celo. Mention, there are no human or "realistic" Elo numbers in enginechess, since the engines reached superhuman strength, so I decided to use "Celo" (=Computer Elo) instead)

 

See the tournament cross-table as a picture (done by Fritz18 GUI) here

See the individual statistics of engine-results here

See the Engines Aggressiveness Score Ratinglist here

See the Gamepair-statistics of the UHO-Top15 Ratinglist here

See the full UHO Ratinglist (with EAS-Ratinglist): here

Download the current gamebase, the full-list gamebase and the archive here

See the old SPCC-Ratinglist (full list) and EAS-List from 2020 until 2023/08/28: here

 

(best Stockfish Celo: Stockfish 250321: 3858 Celo, latest full release (Stockfish 17) had 3843 Celo)

(highest EAS-Score since Stockfish 16 release: Stockfish 240519: 203882 EAS-points)

(Read the explanation of the Lc0-entry in the Ratinglist here).

     Program                    Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 250321 a512    : 3858    4    4 15000    69.9%   3706   48.3%
   2 Stockfish 17 240906      : 3843    4    4 15000    68.1%   3707   49.2%
   3 Torch 3.1 a512           : 3801    4    4 15000    62.5%   3709   48.6%
   4 Obsidian 15.09 a512      : 3771    4    4 15000    58.3%   3711   49.7%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   5 Berserk 250307 a512      : 3739    4    4 15000    53.5%   3714   50.0%
   6 PlentyChess 5.0 a512     : 3738    4    4 15000    53.5%   3714   49.2%
   7 Alexandria 8.0 a512      : 3730    4    4 15000    52.2%   3714   49.6%
   8 KomodoDragon 3.3 avx2    : 3708    4    4 15000    49.0%   3716   50.3%
   9 Integral 7.0 a512        : 3699    4    4 15000    47.8%   3716   48.7%
  10 Caissa 1.21 a512         : 3687    4    4 15000    46.0%   3717   50.5%
  11 Ethereal 14.38 avx2      : 3657    4    4 15000    41.6%   3719   50.0%
  12 Horsie 1.0 a512          : 3649    4    4 15000    40.5%   3720   50.0%
  13 Viridithas 16.0 a512     : 3645    4    4 15000    40.0%   3720   49.4%
  14 RubiChess 240817 avx2    : 3642    4    4 15000    39.5%   3720   49.3%
  15 Starzix 6.0 a512         : 3638    4    4 15000    38.9%   3720   48.9%
  16 Clover 8.1 avx2          : 3637    4    4 15000    38.8%   3720   50.6%

Games        : 120000 (finished)

White Wins   : 58987 (49.2%)
Black Wins   : 1592   (1.3%)
Draws        : 59421 (49.5%)

Below the UHO-Top15 Ratinglist, recalculated with Gamepairs (using my Gamepair Rescoring Tool V1.5), Ordo-calculation fixed to Stockfish 17 = 3843 Celo, realizing Vondele's (Stockfish Maintainer) idea: "Thinking uniquely in game pairs makes sense with the biased openings used these days. While pentanomial makes  sense it is a bit complicated so we could simplify and score game pairs only (not games) as W-L-D (a traditional score of 2-0, or 1.5-0.5 is just a W)."

Mention, the errorbar here is +/-5.5 Celo (=11 overall Error), compared to +/-4 Celo in the classical ratinglist above (=1.375 wider errorbar here). But the result-gaps are (at least) 2x up to 2.5x bigger (in average), calculating with gamepairs. So, the statistical reliability of the results is much better in the Gamepair-ratinglist, compared to the classical ratinglist...

CFS means Chance For Superiority in percent, calculated by ORDO.

See the head-to-head gamepair-statistics of the UHO-Top15 Ratinglist here

   # PLAYER                   :    Celo  Error   Pairs     W     D     L   (%)  CFS(%)
   1 Stockfish 250321 a512    :    3892     12    7500  5936  1403   161  88.5     100
   2 Stockfish 17 240906      :    3843   ----    7500  5565  1658   277  85.3     100
   3 Torch 3.1 a512           :    3707     11    7500  4321  2425   754  73.8     100
   4 Obsidian 15.09 a512      :    3631     11    7500  3551  2764  1185  65.8     100
   5 Berserk 250307 a512      :    3553     11    7500  2740  3016  1744  56.6      68
   6 PlentyChess 5.0 a512     :    3551     11    7500  2683  3090  1727  56.4     100
   7 Alexandria 8.0 a512      :    3531     11    7500  2515  3067  1918  54.0     100
   8 KomodoDragon 3.3 avx2    :    3487     11    7500  2079  3102  2319  48.4     100
   9 Integral 7.0 a512        :    3463     11    7500  1802  3203  2495  45.4     100
  10 Caissa 1.21 a512         :    3437     11    7500  1581  3153  2766  42.1     100
  11 Ethereal 14.38 avx2      :    3369     12    7500  1076  2909  3515  33.7     100
  12 Horsie 1.0 a512          :    3346     11    7500   937  2787  3776  31.1      56
  13 Viridithas 16.0 a512     :    3345     11    7500   929  2792  3779  31.0      62
  14 RubiChess 240817 avx2    :    3344     12    7500   921  2784  3795  30.8     100
  15 Starzix 6.0 a512         :    3328     12    7500   789  2779  3932  29.0      96
  16 Clover 8.1 avx2          :    3320     11    7500   748  2722  4030  28.1     ---

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 21827 (= 36.38%) 
--- Number of 1:1 drawn Gamepairs    : 10624 (= 17.71%) 
--- Number of 2-draws drawn Gamepairs: 11203 (= 18.67%) 
------------------------------------------------------------------- 

Aborted testruns, because the tested engine was too weak to enter the UHO-Top15 Ratinglist:

Igel 3.6.0, Minic 3.41, Booot 7.3, Black Marlin 9.0, Equisetum 1.0

Below you find a diagram of the progress of Stockfish in my tests since February 2023. 

And below that diagram, the older diagrams.

 

You can save the diagrams on your PC with mouseclick (right button) and then choose "save image"...