Stefan Pohl Computer Chess

Home of famous UHO openings and EAS Ratinglist


Latest Website-News (2025/07/10): Testrun of Obsidian 250706 finished: +14 Celo to Obsidian 16.0. Obsidian passed Torch 3.1 and is now the 2nd-strongest engine on the planet behind Stockfish - very impressive !!!

(The CFS (CFS = Chance for Superiority, calculated by ORDO) of Obsidian 250607 (=being really stronger than Torch 3.1) is 97% in the gamepair recalculated ratinglist - just scroll down a little bit on this site)

 

Here the Top5 gamepair-results of Obsidian 250706 (as you can see, in the head-to-head, Torch is still a little bit stronger (won 122 gamepairs, but lost only 118 to Obsidian)):

    vs.                         :  pairs (    +,    =,   -),   (%) :   Diff,   SD, CFS (%)
    Stockfish 250629 a512       :    500 (   23,  183, 294),  22.9 :   -186,    5,    0.0
    Stockfish 17.1 250330       :    500 (   20,  215, 265),  25.5 :   -172,    5,    0.0
    Torch 3.1 a512              :    500 (  118,  260, 122),  49.6 :     +8,    4,   97.5
    PlentyChess 6.02 a512       :    500 (  204,  242,  54),  65.0 :    +90,    4,  100.0
    Berserk 250606 a512         :    500 (  210,  232,  58),  65.2 :   +110,    4,  100.0

 

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 testruns: Integral 250708 dev (binaries by Jim Ablett, download here). And Reckless 250630 dev (binaries by Jim Ablett, download here)

 

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: 2025/07/10: Obsidian 250706 (+14 Celo to Obsidian 16.0)

 

(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 250629 a512    : 3857    4    4 15000    68.7%   3716   48.5%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    68.3%   3717   48.7%
   3 Obsidian 250706 a512     : 3797    4    4 15000    60.5%   3720   49.3%
   4 Torch 3.1 a512           : 3795    4    4 15000    60.2%   3720   48.7%
   5 PlentyChess 6.02 a512    : 3761    4    4 15000    55.3%   3723   50.2%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   6 Berserk 250606 a512      : 3752    4    4 15000    54.1%   3723   49.5%
   7 Alexandria 8.0 a512      : 3720    4    4 15000    49.3%   3725   50.1%
   8 KomodoDragon 3.3 avx2    : 3700    4    4 15000    46.4%   3727   50.0%
   9 Caissa 1.22 a512         : 3691    4    4 15000    45.1%   3727   50.5%
  10 Integral 7.0 a512        : 3686    4    4 15000    44.4%   3728   48.8%
  11 Stormphrax 7.0 avx2      : 3681    4    4 15000    43.7%   3728   49.3%
  12 Reckless 250521 a512     : 3668    4    4 15000    41.8%   3729   49.5%
  13 Viridithas 17.0 a512     : 3667    4    4 15000    41.6%   3729   51.2%
  14 Horsie 1.1 a512          : 3662    4    4 15000    40.9%   3729   49.2%
  15 RubiChess 250606 a512    : 3662    4    4 15000    40.9%   3729   49.9%
  16 Ethereal 14.38 avx2      : 3649    4    4 15000    39.0%   3730   49.7%

 

Games        : 120000 (finished)
White Wins   : 59317 (49.4%)
Black Wins   : 1186   (1.0%)
Draws        : 59497 (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 250629 a512    :    3868     12    7500  5675  1645   180  86.6      99
   2 Stockfish 17.1 250330    :    3854   ----    7500  5551  1747   202  85.7     100
   3 Obsidian 250706 a512     :    3682     11    7500  3990  2584   926  70.4      97
   4 Torch 3.1 a512           :    3674     11    7500  3875  2682   943  69.5     100
   5 PlentyChess 6.02 a512    :    3592     11    7500  3038  2960  1502  60.2     100
   6 Berserk 250606 a512      :    3572     11    7500  2791  3089  1620  57.8     100
   7 Alexandria 8.0 a512      :    3499     11    7500  2037  3201  2262  48.5     100
   8 KomodoDragon 3.3 avx2    :    3458     11    7500  1645  3206  2649  43.3     100
   9 Caissa 1.22 a512         :    3436     11    7500  1467  3134  2899  40.5     100
  10 Integral 7.0 a512        :    3423     11    7500  1326  3179  2995  38.9      99
  11 Stormphrax 7.0 avx2      :    3413     11    7500  1256  3123  3121  37.6     100
  12 Viridithas 17.0 a512     :    3385     11    7500  1081  2955  3464  34.1      81
  13 Reckless 250521 a512     :    3381     11    7500  1044  2959  3497  33.6      98
  14 RubiChess 250606 a512    :    3371     11    7500   936  3002  3562  32.5      87
  15 Horsie 1.1 a512          :    3366     11    7500   955  2874  3671  31.9     100
  16 Ethereal 14.38 avx2      :    3340     11    7500   770  2786  3944  28.8     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 22563 (= 37.60%) 
--- Number of 1:1 drawn Gamepairs    : 11125 (= 18.54%) 
--- Number of 2-draws drawn Gamepairs: 11438 (= 19.06%) 
------------------------------------------------------------------- 


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

Halogen 13, 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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