Stefan Pohl Computer Chess

Latest Website-News (2025/12/19): Testrun of Torch 4a finished: +14 Celo to Torch 4.

Testrun of PlentyChess 7.0.37 finished: +9 Celo to PlentyChess 7.0.22.

Torch jumped back on rank #2. And right now the first 7 engines have a CFS (=Chance For Superiority) in the gamepair-ratinglist of 100%, so the ranking (not the rating!) of the first 7 engines is very valid.

 

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: Quanticade 3.0 - will it be strong enough to enter the UHO-Top15 Ratinglist?

 

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: 2025/12/19: Torch 4a (+14 Celo to Torch 4) & PlentyChess 7.0.37 (+9 Celo to PlentyChess 7.0.22)

 

(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 251130: 3872 Celo, latest full release (Stockfish 17.1) had 3854 Celo)

     Program                     Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 251130 a512     : 3873    4    4 15000    68.1%   3736   48.7%
   2 Stockfish 17.1 250330     : 3854    4    4 15000    65.6%   3738   49.0%
   3 Torch 4a a512             : 3820    4    4 15000    60.9%   3740   49.3%
   4 Reckless 251212 a512      : 3810    4    4 15000    59.5%   3741   48.5%
   5 PlentyChess 7.0.37        : 3803    4    4 15000    58.5%   3741   48.2%
   6 Obsidian 250706 a512      : 3785    4    4 15000    55.9%   3742   50.1%
   7 Integral 250805 a512      : 3755    4    4 15000    51.5%   3744   50.1%
   8 Berserk 250606 a512       : 3736    4    4 15000    48.8%   3745   50.0%
   9 Alexandria 8.1.12 a512    : 3734    4    4 15000    48.5%   3746   50.5%
  10 Caissa 1.24 a512          : 3697    4    4 15000    43.1%   3748   50.4%
  11 Clover 9.1 a512           : 3693    4    4 15000    42.6%   3748   50.5%
  12 KomodoDragon 3.3 avx2     : 3691    4    4 15000    42.1%   3748   49.8%
  13 Viridithas 18.0 a512      : 3690    4    4 15000    42.0%   3748   49.4%
  14 Stormphrax 7.0 avx2       : 3670    4    4 15000    39.2%   3750   48.4%
  15 Horsie 1.1 a512           : 3654    4    4 15000    37.0%   3751   48.8%
  16 RubiChess 250606 a512     : 3652    4    4 15000    36.8%   3751   49.0%

 

Games        : 120000 (finished)
White Wins   : 59546 (49.6%)
Black Wins   : 1140   (0.9%)
Draws        : 59314 (49.4%)

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 251130 a512     :    3913     11    7500  5469  1856   175  85.3     100
   2 Stockfish 17.1 250330     :    3854   ----    7500  4936  2212   352  80.6     100
   3 Torch 4a a512             :    3758     10    7500  3995  2695   810  71.2     100
   4 Reckless 251212 a512      :    3729      9    7500  3664  2889   947  68.1     100
   5 PlentyChess 7.0.37        :    3711     10    7500  3498  2919  1083  66.1     100
   6 Obsidian 250706 a512      :    3672     10    7500  3098  3040  1362  61.6     100
   7 Integral 250805 a512      :    3602      9    7500  2406  3134  1960  53.0     100
   8 Berserk 250606 a512       :    3557      9    7500  1947  3215  2338  47.4      81
   9 Alexandria 8.1.12 a512    :    3554     10    7500  1937  3165  2398  46.9     100
  10 Caissa 1.24 a512          :    3470      9    7500  1225  3042  3233  36.6      99
  11 Clover 9.1 a512           :    3460     10    7500  1148  3000  3352  35.3      57
  12 KomodoDragon 3.3 avx2     :    3459      9    7500  1155  2973  3372  35.2      88
  13 Viridithas 18.0 a512      :    3454     10    7500  1104  2989  3407  34.6     100
  14 Stormphrax 7.0 avx2       :    3403     10    7500   769  2780  3951  28.8     100
  15 RubiChess 250606 a512     :    3366      9    7500   583  2549  4368  24.8      71
  16 Horsie 1.1 a512           :    3363     10    7500   574  2526  4400  24.5     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 22492 (= 37.49%) 
--- Number of 1:1 drawn Gamepairs    : 11181 (= 18.63%) 
--- Number of 2-draws drawn Gamepairs: 11311 (= 18.85%) 
------------------------------------------------------------------- 

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"...