Stefan Pohl Computer Chess

Latest Website-News (2025/12/28): Testrun of Stockfish 251223 finished: +1 Celo to Stockfish 251130.

 

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 251228

 

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: 2025/12/28: Stockfish 251223 (+1 Celo to Stockfish 251130)

 

(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

Download all interesting wins (filtered by EAS-Tool) from the full UHO Ratinglist here

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

 

(best Stockfish Celo: Stockfish 251223: 3874 Celo, latest full release (Stockfish 17.1) had 3854 Celo)

     Program                     Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 251223 a512     : 3874    4    4 15000    68.0%   3738   48.7%
   2 Stockfish 17.1 250330     : 3854    4    4 15000    65.4%   3739   48.8%
   3 Torch 4a a512             : 3820    4    4 15000    60.7%   3742   49.4%
   4 Reckless 251212 a512      : 3810    4    4 15000    59.2%   3742   48.6%
   5 PlentyChess 7.0.37        : 3803    4    4 15000    58.3%   3743   48.2%
   6 Obsidian 250706 a512      : 3785    4    4 15000    55.8%   3744   50.1%
   7 Integral 250805 a512      : 3755    4    4 15000    51.3%   3746   49.8%
   8 Berserk 250606 a512       : 3737    4    4 15000    48.6%   3747   50.0%
   9 Alexandria 8.1.12 a512    : 3734    4    4 15000    48.2%   3747   50.1%
  10 Caissa 1.24 a512          : 3697    4    4 15000    42.8%   3750   50.2%
  11 Clover 9.1 a512           : 3693    4    4 15000    42.3%   3750   50.3%
  12 KomodoDragon 3.3 avx2     : 3690    4    4 15000    41.8%   3750   49.7%
  13 Viridithas 18.0 a512      : 3690    4    4 15000    41.8%   3750   49.3%
  14 Quanticade 3.0 a512       : 3679    4    4 15000    40.2%   3751   48.0%
  15 Stormphrax 7.0 avx2       : 3669    4    4 15000    38.8%   3752   48.5%
  16 Horsie 1.1 a512           : 3654    4    4 15000    36.7%   3753   48.8%

 

Games        : 120000 (finished)
White Wins   : 59775 (49.8%)
Black Wins   : 1069   (0.9%)
Draws        : 59156 (49.3%)

Below the UHO-Top15 Ratinglist, recalculated with Gamepairs (using my Gamepair Rescoring Tool V1.5), Ordo-calculation fixed to Stockfish 17.1 = 3854 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 251223 a512     :    3914     11    7500  5442  1892   166  85.2     100
   2 Stockfish 17.1 250330     :    3854   ----    7500  4909  2219   372  80.2     100
   3 Torch 4a a512             :    3759     10    7500  3954  2726   820  70.9     100
   4 Reckless 251212 a512      :    3730     10    7500  3610  2944   946  67.8     100
   5 PlentyChess 7.0.37        :    3713     10    7500  3452  2974  1074  65.9     100
   6 Obsidian 250706 a512      :    3675     10    7500  3057  3078  1365  61.3     100
   7 Integral 250805 a512      :    3604     10    7500  2343  3194  1963  52.5     100
   8 Berserk 250606 a512       :    3560      9    7500  1899  3252  2349  47.0      82
   9 Alexandria 8.1.12 a512    :    3556     10    7500  1884  3205  2411  46.5     100
  10 Caissa 1.24 a512          :    3472     10    7500  1166  3069  3265  36.0      99
  11 Clover 9.1 a512           :    3462     10    7500  1105  3006  3389  34.8      61
  12 KomodoDragon 3.3 avx2     :    3461     10    7500  1115  2964  3421  34.6      82
  13 Viridithas 18.0 a512      :    3457     10    7500  1047  3033  3420  34.2     100
  14 Quanticade 3.0 a512       :    3431     10    7500   887  2890  3723  31.1     100
  15 Stormphrax 7.0 avx2       :    3405     10    7500   726  2767  4007  28.1     100
  16 Horsie 1.1 a512           :    3366     10    7500   541  2513  4446  24.0     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 22863 (= 38.10%) 
--- Number of 1:1 drawn Gamepairs    : 11466 (= 19.11%) 
--- Number of 2-draws drawn Gamepairs: 11397 (= 18.99%) 
------------------------------------------------------------------- 

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

Heimdall 1.4.1, Renegade 1.2.0, Igel 3.6.0, Minic 3.41, Booot 7.3, Black Marlin 9.0, Equisetum 1.0, Quanticade 2.0, Clarity 8

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"...