Stefan Pohl Computer Chess

Latest Website-News (2026/06/22): Testrun of Quanticade 260617 finished (dev, taken from official GitHub): +24 Celo to Quanticade 260519. Very impressive progress in just 1 month.

 

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). 

 

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: 2026/06/22: Quanticade 260617 (+24 Celo to Quanticade 260519)

 

(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    68.1%   3756   48.7%
   2 Stockfish 18 260131       : 3873    4    4 15000    65.7%   3757   48.9%
   3 Reckless 260502 a512      : 3839    4    4 15000    61.0%   3759   48.4%
   4 Torch 4d a512             : 3824    4    4 15000    58.8%   3760   49.9%
   5 PlentyChess 7.0.37        : 3797    4    4 15000    54.9%   3762   48.7%
   6 Obsidian 250706 a512      : 3779    4    4 15000    52.3%   3763   49.4%
   7 Alexandria 9.0 a512       : 3752    4    4 15000    48.2%   3765   49.0%
   8 Pawnocchio 260527 a512    : 3750    4    4 15000    47.9%   3765   49.3%
   9 Integral 250805 a512      : 3746    4    4 15000    47.4%   3765   50.4%
  10 Berserk 14.0 a512         : 3734    4    4 15000    45.6%   3766   49.2%
  11 Quanticade 260617 a512    : 3720    4    4 15000    43.5%   3767   49.1%
  12 Viridithas 19.0 a512      : 3717    4    4 15000    43.1%   3767   49.3%
  13 Raphael 260609 a512       : 3708    4    4 15000    41.9%   3768   49.2%
  14 Halogen 16.5 a512         : 3701    4    4 15000    40.8%   3768   48.7%
  15 Caissa 1.25 a512          : 3699    4    4 15000    40.5%   3769   49.4%
  16 Tarnished 6.0 a512        : 3698    4    4 15000    40.4%   3769   49.3%

 

Games        : 120000 (finished)
White Wins   : 60131 (50.1%)
Black Wins   : 845    (0.7%)
Draws        : 59024 (49.2%)

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          :    3931     11    7500  5473  1882   145  85.5     100
   2 Stockfish 18 260131       :    3873   ----    7500  4942  2237   321  80.8     100
   3 Reckless 260502 a512      :    3778     10    7500  3934  2852   714  71.5     100
   4 Torch 4d a512             :    3742     10    7500  3500  3105   895  67.4     100
   5 PlentyChess 7.0.37        :    3675      9    7500  2784  3325  1391  59.3     100
   6 Obsidian 250706 a512      :    3637     10    7500  2387  3392  1721  54.4     100
   7 Alexandria 9.0 a512       :    3577     10    7500  1772  3428  2300  46.5      92
   8 Pawnocchio 260527 a512    :    3571     10    7500  1745  3365  2390  45.7      90
   9 Integral 250805 a512      :    3566     10    7500  1682  3383  2435  45.0     100
  10 Berserk 14.0 a512         :    3536     10    7500  1413  3347  2740  41.2     100
  11 Quanticade 260617 a512    :    3506     10    7500  1132  3326  3042  37.3      91
  12 Viridithas 19.0 a512      :    3501     10    7500  1100  3279  3121  36.5     100
  13 Raphael 260609 a512       :    3478     10    7500   948  3161  3391  33.7      98
  14 Halogen 16.5 a512         :    3469     10    7500   871  3151  3478  32.6      99
  15 Caissa 1.25 a512          :    3459     10    7500   820  3066  3614  31.4      55
  16 Tarnished 6.0 a512        :    3458     11    7500   831  3033  3636  31.3     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 24666 (= 41.11%) 
--- Number of 1:1 drawn Gamepairs    : 12535 (= 20.89%) 
--- Number of 2-draws drawn Gamepairs: 12131 (= 20.22%) 
------------------------------------------------------------------- 

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"...