Stefan Pohl Computer Chess

Latest Website-News (2026/07/09): Testrun of Stormphrax 8.0.0 avx512 finished: +81 Celo to Stormphrax 7.0. Stormphrax re-entered the UHO-Top15 Ratinglist and kicked Tarnished 6.0 out.

 

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: Cinder 0.5.1 and Stockfish 260706. Followed by PZChessBot v7.1, Heimdall 1.5.

 

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: 2026/07/09: Stormphrax 8.0.0 (if there is no info on the binary in the engine-name, I normally use the avx512 binary) (+81 Celo to Stormphrax 7.0)

 

(Ordo-calculation fixed to Stockfish 18 = 3873 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 260614: 3891 Celo, latest full release (Stockfish 18) has 3873 Celo)

     Program                     Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 260614          : 3891    4    4 15000    67.1%   3764   49.0%
   2 Stockfish 18 260131       : 3873    4    4 15000    64.6%   3765   49.0%
   3 Reckless 260502 a512      : 3836    4    4 15000    59.5%   3767   49.0%
   4 Torch 4d a512             : 3819    4    4 15000    56.9%   3769   49.9%
   5 PlentyChess 8.0.0         : 3815    4    4 15000    56.4%   3769   48.0%
   6 Pawnocchio 2.0 a512       : 3793    4    4 15000    53.2%   3770   49.3%
   7 Obsidian 250706 a512      : 3774    4    4 15000    50.4%   3772   48.9%
   8 Viridithas 20.0 a512      : 3772    4    4 15000    50.0%   3772   50.0%
   9 Alexandria 9.0 a512       : 3747    4    4 15000    46.4%   3773   49.0%
  10 Integral 250805 a512      : 3743    4    4 15000    45.8%   3774   49.6%
  11 Stormphrax 8.0.0          : 3741    4    4 15000    45.5%   3774   49.0%
  12 Berserk 14.0 a512         : 3729    4    4 15000    43.8%   3775   49.3%
  13 Quanticade 260617 a512    : 3713    3    3 15000    41.5%   3776   49.1%
  14 Raphael 4.2.0 a512        : 3711    4    4 15000    41.1%   3776   48.9%
  15 Halogen 16.5 a512         : 3698    4    4 15000    39.2%   3777   48.6%
  16 Caissa 1.25 a512          : 3694    4    4 15000    38.7%   3777   49.6%

 

Games        : 120000 (finished)
White Wins   : 60281 (50.2%)
Black Wins   : 753    (0.6%)
Draws        : 58966 (49.1%)

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 260614          :    3925     10    7500  5201  2129   170  83.5     100
   2 Stockfish 18 260131       :    3873   ----    7500  4691  2453   356  78.9     100
   3 Reckless 260502 a512      :    3775      9    7500  3582  3110   808  68.5     100
   4 Torch 4d a512             :    3735      9    7500  3119  3314  1067  63.7      99
   5 PlentyChess 8.0.0         :    3725      9    7500  3006  3347  1147  62.4     100
   6 Pawnocchio 2.0 a512       :    3677      9    7500  2521  3386  1593  56.2     100
   7 Obsidian 250706 a512      :    3635     10    7500  2081  3444  1975  50.7      91
   8 Viridithas 20.0 a512      :    3629      9    7500  2011  3466  2023  49.9     100
   9 Alexandria 9.0 a512       :    3576      9    7500  1471  3474  2555  42.8      98
  10 Integral 250805 a512      :    3567      9    7500  1400  3452  2648  41.7      68
  11 Stormphrax 8.0.0          :    3565      9    7500  1390  3431  2679  41.4     100
  12 Berserk 14.0 a512         :    3535      9    7500  1176  3278  3046  37.5     100
  13 Quanticade 260617 a512    :    3502     10    7500   898  3192  3410  33.3      97
  14 Raphael 4.2.0 a512        :    3493      9    7500   835  3164  3501  32.2     100
  15 Halogen 16.5 a512         :    3470     10    7500   685  3054  3761  29.5     100

  16 Caissa 1.25 a512          :    3456      9    7500   636  2900  3964  27.8     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 25297 (= 42.16%) 
--- Number of 1:1 drawn Gamepairs    : 12903 (= 21.50%) 
--- Number of 2-draws drawn Gamepairs: 12394 (= 20.66%) 
------------------------------------------------------------------- 

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

Icarus 1.1, Raphael 4.0, 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, Clarity 8

Below you find a diagram of the progress of Stockfish in my tests since February 2026. 

And below that diagram, the older diagrams.

 

You can save the diagrams on your PC with mouseclick (right button) and then choose "save image"...