Stefan Pohl Computer Chess

Latest Website-News (2025/07/18): Testrun of Viridithas 250712 avx512 (binaries by Jim Ablett, download here) finished: +20 Celo to Viridithas 17.

 

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: Torch 4 (Andrew Grant and chesscom provided me the new Torch 4 for testing - thanks)

 

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: 2025/07/18: Viridithas 250712 (+20 Celo to Viridithas 17)

 

(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    : 3858    4    4 15000    68.0%   3722   48.4%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    67.5%   3723   48.8%
   3 Obsidian 250706 a512     : 3792    4    4 15000    59.0%   3727   49.5%
   4 Torch 3.1 a512           : 3791    4    4 15000    58.8%   3727   49.4%
   5 Integral 250708 a512     : 3757    4    4 15000    53.9%   3729   50.6%
   6 PlentyChess 6.02 a512    : 3753    4    4 15000    53.3%   3729   50.2%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   7 Berserk 250606 a512      : 3746    4    4 15000    52.3%   3730   49.8%
   8 Reckless 250630 bmi2     : 3736    4    4 15000    50.9%   3731   49.3%
   9 Alexandria 8.0 a512      : 3714    4    4 15000    47.6%   3732   50.5%
  10 KomodoDragon 3.3 avx2    : 3695    4    4 15000    44.8%   3733   50.0%
  11 Caissa 1.22 a512         : 3683    4    4 15000    43.0%   3734   50.7%
  12 Viridithas 250712        : 3681    4    4 15000    42.7%   3734   50.3%
  13 Stormphrax 7.0 avx2      : 3677    4    4 15000    42.1%   3735   49.1%
  14 RubiChess 250606 a512    : 3657    4    4 15000    39.3%   3736   49.9%
  15 Horsie 1.1 a512          : 3655    4    4 15000    39.1%   3736   49.1%
  16 Clover 8.2 a512          : 3645    4    4 15000    37.6%   3737   51.3%

 

Games        : 120000 (finished)
White Wins   : 59211 (49.3%)
Black Wins   : 1009   (0.8%)
Draws        : 59780 (49.8%)

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 250629 a512    :    3868     11    7500  5502  1803   195  85.4      99
   2 Stockfish 17.1 250330    :    3854   ----    7500  5360  1924   216  84.3     100
   3 Obsidian 250706 a512     :    3680     10    7500  3661  2815  1024  67.6      88
   4 Torch 3.1 a512           :    3675     10    7500  3608  2835  1057  67.0     100
   5 Integral 250708 a512     :    3597     10    7500  2721  3202  1577  57.6      99
   6 PlentyChess 6.02 a512    :    3587     10    7500  2654  3145  1701  56.4     100
   7 Berserk 250606 a512      :    3571     10    7500  2452  3243  1805  54.3     100
   8 Reckless 250630 bmi2     :    3549     10    7500  2263  3209  2028  51.6     100
   9 Alexandria 8.0 a512      :    3500     11    7500  1746  3290  2464  45.2     100
  10 KomodoDragon 3.3 avx2    :    3462     10    7500  1449  3146  2905  40.3     100
  11 Caissa 1.22 a512         :    3431     11    7500  1188  3092  3220  36.5      80
  12 Viridithas 250712        :    3428     11    7500  1154  3092  3254  36.0     100
  13 Stormphrax 7.0 avx2      :    3415     11    7500  1080  3015  3405  34.5     100
  14 RubiChess 250606 a512    :    3374     10    7500   766  2900  3834  29.5      99
  15 Horsie 1.1 a512          :    3363     11    7500   752  2753  3995  28.4     100
  16 Clover 8.2 a512          :    3337     11    7500   598  2628  4274  25.5     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 23046 (= 38.41%) 
--- Number of 1:1 drawn Gamepairs    : 11299 (= 18.83%) 
--- Number of 2-draws drawn Gamepairs: 11747 (= 19.58%) 
------------------------------------------------------------------- 

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, 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"...