Stefan Pohl Computer Chess

Home of famous UHO openings and EAS Ratinglist


Latest Website-News (2025/07/14): Testrun of Reckless 250630 (binaries by Jim Ablett, download here ) finished: +72 Celo to Reckless 250521 - incredible progress in just 5 weeks... Reckless jumped from rank #12 to rank #8.

 

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: Clover 8.2 (binaries by Jim Ablett (around +30% faster on my machines, than the binaries by the author, Jim is a wizard...), download here) and Viridithas 250712 (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: 2025/07/14: Reckless 250630 (+72 Celo to Reckless 250521)

 

(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    68.1%   3722   48.3%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    67.6%   3722   48.8%
   3 Obsidian 250706 a512     : 3793    4    4 15000    59.2%   3726   49.4%
   4 Torch 3.1 a512           : 3792    4    4 15000    59.0%   3726   49.2%
   5 Integral 250708 a512     : 3758    4    4 15000    54.1%   3728   50.2%
   6 PlentyChess 6.02 a512    : 3754    4    4 15000    53.6%   3729   50.5%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   7 Berserk 250606 a512      : 3747    4    4 15000    52.6%   3729   49.8%
   8 Reckless 250630 bmi2     : 3738    4    4 15000    51.2%   3730   49.5%
   9 Alexandria 8.0 a512      : 3715    4    4 15000    47.9%   3731   50.2%
  10 KomodoDragon 3.3 avx2    : 3695    4    4 15000    44.9%   3733   49.9%
  11 Caissa 1.22 a512         : 3684    4    4 15000    43.3%   3733   50.4%
  12 Stormphrax 7.0 avx2      : 3676    4    4 15000    42.2%   3734   49.1%
  13 Viridithas 17.0 a512     : 3661    4    4 15000    40.0%   3735   50.9%
  14 Horsie 1.1 a512          : 3657    4    4 15000    39.4%   3735   49.4%
  15 RubiChess 250606 a512    : 3657    4    4 15000    39.4%   3735   50.0%
  16 Ethereal 14.38 avx2      : 3644    4    4 15000    37.6%   3736   49.9%

 

Games        : 120000 (finished)
White Wins   : 59154 (49.3%)
Black Wins   : 1168   (1.0%)
Draws        : 59678 (49.7%)


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    :    3869     11    7500  5518  1786   196  85.5      99
   2 Stockfish 17.1 250330    :    3854   ----    7500  5369  1918   213  84.4     100
   3 Obsidian 250706 a512     :    3681     11    7500  3709  2775  1016  68.0      90
   4 Torch 3.1 a512           :    3676     11    7500  3636  2826  1038  67.3     100
   5 Integral 250708 a512     :    3598     10    7500  2774  3160  1566  58.1      99
   6 PlentyChess 6.02 a512    :    3588     10    7500  2703  3112  1685  56.8     100
   7 Berserk 250606 a512      :    3572     11    7500  2514  3193  1793  54.8     100
   8 Reckless 250630 bmi2     :    3550     10    7500  2307  3191  2002  52.0     100
   9 Alexandria 8.0 a512      :    3500     10    7500  1794  3250  2456  45.6     100
  10 KomodoDragon 3.3 avx2    :    3459     10    7500  1449  3160  2891  40.4     100
  11 Caissa 1.22 a512         :    3432     11    7500  1242  3061  3197  37.0     100
  12 Stormphrax 7.0 avx2      :    3412     11    7500  1070  3038  3392  34.5     100
  13 Viridithas 17.0 a512     :    3382     11    7500   911  2825  3764  31.0     100
  14 RubiChess 250606 a512    :    3371     10    7500   781  2880  3839  29.6      89
  15 Horsie 1.1 a512          :    3365     11    7500   792  2762  3946  29.0     100
  16 Ethereal 14.38 avx2      :    3340     11    7500   632  2661  4207  26.2     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 22799 (= 38.00%) 
--- Number of 1:1 drawn Gamepairs    : 11153 (= 18.59%) 
--- Number of 2-draws drawn Gamepairs: 11646 (= 19.41%) 
------------------------------------------------------------------- 


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"...







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