Stefan Pohl Computer Chess

Home of famous UHO openings and EAS Ratinglist


Latest Website-News (2025/04/21): Testrun of Obsidian 15.14 finished: +5 Celo to Obsidian 15.09. Jim Ablett provided binaries of Obsidian 15.14 (The JA avx512 binary is around +6% faster on my machines, than the avx512 binary of Obsidian 15.09 (provided by the author)). You can download the JA binaries of Obsidian 15.14 here

 

Super 3 Tournament updated.

 

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)

 

Next testrun: Stockfish 250418

 

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

OpeningsMy 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: 2025/04/21: Obsidian 15.14 (+5 Celo to Obsidian 15.09)

 

(Ordo-calculation fixed to Stockfish 17.1 = 3854 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 17.1) had 3854 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 250402 a512    : 3857    4    4 15000    69.6%   3709   48.0%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    69.1%   3709   48.4%
   3 Torch 3.1 a512           : 3799    4    4 15000    61.8%   3713   48.5%
   4 Obsidian 15.14 a512      : 3776    4    4 15000    58.5%   3714   49.7%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   5 Berserk 250307 a512      : 3739    3    3 15000    53.1%   3717   50.0%
   6 PlentyChess 5.0 a512     : 3737    4    4 15000    52.9%   3717   48.9%
   7 Alexandria 8.0 a512      : 3729    4    4 15000    51.7%   3717   49.9%
   8 KomodoDragon 3.3 avx2    : 3708    4    4 15000    48.6%   3719   50.2%
   9 Integral 7.0 a512        : 3700    4    4 15000    47.4%   3719   48.8%
  10 Caissa 1.21 a512         : 3688    4    4 15000    45.7%   3720   50.5%
  11 Viridithas 17.0 a512     : 3677    4    4 15000    44.1%   3721   50.7%
  12 Ethereal 14.38 avx2      : 3657    4    4 15000    41.2%   3722   50.1%
  13 Horsie 1.0 a512          : 3649    4    4 15000    40.0%   3723   50.0%
  14 RubiChess 240817 avx2    : 3641    4    4 15000    39.0%   3723   49.4%
  15 Starzix 6.0 a512         : 3638    4    4 15000    38.6%   3723   49.2%
  16 Clover 8.1 avx2          : 3637    4    4 15000    38.5%   3723   50.9%


Games        : 120000 (finished)

White Wins   : 58992 (49.2%)
Black Wins   : 1535   (1.3%)
Draws        : 59473 (49.6%)


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 250402 a512    :    3869     12    7500  5860  1476   164  88.0      99
   2 Stockfish 17.1 250330    :    3854   ----    7500  5734  1586   180  87.0     100
   3 Torch 3.1 a512           :    3678     11    7500  4204  2456   840  72.4     100
   4 Obsidian 15.14 a512      :    3620     11    7500  3614  2721  1165  66.3     100
   5 Berserk 250307 a512      :    3531     11    7500  2657  3074  1769  55.9      84
   6 PlentyChess 5.0 a512     :    3527     11    7500  2592  3125  1783  55.4     100
   7 Alexandria 8.0 a512      :    3509     11    7500  2439  3093  1968  53.1     100
   8 KomodoDragon 3.3 avx2    :    3465     11    7500  2020  3117  2363  47.7     100
   9 Integral 7.0 a512        :    3442     11    7500  1764  3184  2552  44.7     100
  10 Caissa 1.21 a512         :    3417     11    7500  1553  3134  2813  41.6     100
  11 Viridithas 17.0 a512     :    3396     11    7500  1393  3054  3053  38.9     100
  12 Ethereal 14.38 avx2      :    3348     12    7500  1013  2934  3553  33.1     100
  13 Horsie 1.0 a512          :    3323     11    7500   872  2778  3850  30.1      79
  14 RubiChess 240817 avx2    :    3319     12    7500   858  2745  3897  29.7     100
  15 Starzix 6.0 a512         :    3307     12    7500   762  2736  4002  28.4      97
  16 Clover 8.1 avx2          :    3299     12    7500   715  2687  4098  27.4     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 21950 (= 36.58%) 
--- Number of 1:1 drawn Gamepairs    : 10673 (= 17.79%) 
--- Number of 2-draws drawn Gamepairs: 11277 (= 18.79%) 
------------------------------------------------------------------- 


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"...







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