Stefan Pohl Computer Chess

Home of famous UHO openings and EAS Ratinglist


Latest Website-News (2025/06/24): Super 3 Tournament updated.

Testrun of PlentyChess 6.02 finished: +13 Celo to PlentyChess 6.0. Nice progress. PlentyChess passed Berserk and is now the worlds #4 engine (behind Stockfish, Torch and Obsidian).

 

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).

 

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: 2025/06/20: PlentyChess 6.02 (+13 Celo to PlentyChess 6.0)

 

(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 Fritz20 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 250525 a512    : 3856    4    4 15000    68.6%   3715   48.8%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    68.4%   3715   48.7%
   3 Torch 3.1 a512           : 3796    4    4 15000    60.6%   3719   49.0%
   4 Obsidian 16.0v a512      : 3784    4    4 15000    58.8%   3720   49.6%
   5 PlentyChess 6.02 a512    : 3764    4    4 15000    56.0%   3721   50.5%
   6 Berserk 250606 a512      : 3754    4    4 15000    54.5%   3722   49.6%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   7 Alexandria 8.0 a512      : 3722    4    4 15000    49.9%   3724   50.5%
   8 KomodoDragon 3.3 avx2    : 3702    4    4 15000    46.9%   3725   50.3%
   9 Caissa 1.22 a512         : 3694    4    4 15000    45.7%   3726   50.8%
  10 Integral 7.0 a512        : 3689    4    4 15000    45.0%   3726   48.5%
  11 Reckless 250521 a512     : 3670    4    4 15000    42.3%   3727   49.4%
  12 Viridithas 17.0 a512     : 3669    4    4 15000    42.1%   3727   51.2%
  13 RubiChess 250606 a512    : 3665    4    4 15000    41.5%   3728   50.3%
  14 Horsie 1.1 a512          : 3665    4    4 15000    41.5%   3728   49.4%
  15 Ethereal 14.38 avx2      : 3651    4    4 15000    39.5%   3729   49.8%
  16 Motor 0.90 avx2          : 3646    4    4 15000    38.8%   3729   50.6%

 

Games        : 120000 (finished)
White Wins   : 59015 (49.2%)
Black Wins   : 1208   (1.0%)
Draws        : 59777 (49.8%)


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 250525 a512    :    3861     11    7500  5637  1699   164  86.5      90
   2 Stockfish 17.1 250330    :    3854   ----    7500  5610  1677   213  86.0     100
   3 Torch 3.1 a512           :    3677     10    7500  3941  2669   890  70.3     100
   4 Obsidian 16.0v a512      :    3648     10    7500  3648  2776  1076  67.1     100
   5 PlentyChess 6.02 a512    :    3599     11    7500  3148  2928  1424  61.5     100
   6 Berserk 250606 a512      :    3575     10    7500  2872  3047  1581  58.6     100
   7 Alexandria 8.0 a512      :    3503     11    7500  2109  3216  2175  49.6     100
   8 KomodoDragon 3.3 avx2    :    3461     10    7500  1712  3217  2571  44.3     100
   9 Caissa 1.22 a512         :    3440     11    7500  1556  3115  2829  41.5     100
  10 Integral 7.0 a512        :    3428     10    7500  1405  3198  2897  40.1     100
  11 Viridithas 17.0 a512     :    3387     11    7500  1122  2998  3380  34.9      73
  12 Reckless 250521 a512     :    3384     10    7500  1114  2967  3419  34.6      92
  13 RubiChess 250606 a512    :    3378     11    7500  1015  3049  3436  33.9      92
  14 Horsie 1.1 a512          :    3372     11    7500  1022  2921  3557  33.1     100
  15 Ethereal 14.38 avx2      :    3344     11    7500   846  2783  3871  29.8     100
  16 Motor 0.90 avx2          :    3330     11    7500   756  2714  4030  28.2     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 22487 (= 37.48%) 
--- Number of 1:1 drawn Gamepairs    : 10931 (= 18.22%) 
--- Number of 2-draws drawn Gamepairs: 11556 (= 19.26%) 
------------------------------------------------------------------- 


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

Renegade 1.2.0, 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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