Stefan Pohl Computer Chess

Latest Website-News (2026/04/10): Testrun of Caissa 1.25 finished: +11 Celo to Caissa 1.24.

Testrun of Stockfish 260402 finished: +1 Celo to Stockfish 260318.

 

My gift to the community - a much better cutechessGUI. Made by Patrick Leonhardt (PlentyChess), payed for the work by me. Learn more about new cutechess on talkchess and download it right here 

Please mention, this is an early release, bugs are still possible - please report them on talkchess or contact me.

 

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: Stockfish 260409

 

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: 2026/04/10: Stockfish 260402 (+1 Celo to Stockfish 260318) and Caissa 1.25 (+11 Celo to Caissa 1.24)

 

(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 260402: 3879 Celo, latest full release (Stockfish 18) has 3873 Celo)

     Program                    Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 260402 a512    : 3879    4    4 15000    67.3%   3749   48.4%
   2 Stockfish 18 260131      : 3873    4    4 15000    66.5%   3749   49.1%
   3 Reckless 260401 a512     : 3844    4    4 15000    62.6%   3751   48.8%
   4 Torch 4d a512            : 3827    4    4 15000    60.2%   3752   50.0%
   5 PlentyChess 7.0.37       : 3800    4    4 15000    56.4%   3754   48.2%
   6 Obsidian 250706 a512     : 3784    4    4 15000    54.1%   3755   49.9%
   7 Alexandria 9.0 a512      : 3757    4    4 15000    50.1%   3757   49.2%
   8 Integral 250805 a512     : 3753    4    4 15000    49.5%   3757   50.5%
   9 Berserk 250606 a512      : 3738    4    4 15000    47.3%   3758   50.3%
  10 Viridithas 19.0 a512     : 3723    4    4 15000    45.1%   3759   49.4%
  11 Caissa 1.25 a512         : 3704    4    4 15000    42.3%   3760   50.0%
  12 Clover 9.1 a512          : 3692    4    4 15000    40.6%   3761   50.6%
  13 KomodoDragon 3.3 avx2    : 3690    4    4 15000    40.3%   3761   49.3%
  14 Halogen 16.0 a512        : 3686    4    4 15000    39.8%   3762   49.0%
  15 Tarnished 5.0 a512       : 3683    4    4 15000    39.3%   3762   50.1%
  16 Pawnocchio 1.9 a512      : 3677    4    4 15000    38.5%   3762   50.4%

 

Games        : 120000 (finished)
White Wins   : 59456 (49.5%)
Black Wins   : 1064   (0.9%)
Draws        : 59480 (49.6%)

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 260402 a512    :    3893     11    7500  5319  1955   226  84.0     100
   2 Stockfish 18 260131      :    3873   ----    7500  5126  2105   269  82.4     100
   3 Reckless 260401 a512     :    3785     11    7500  4306  2537   657  74.3     100
   4 Torch 4d a512            :    3743     10    7500  3836  2815   849  69.9     100
   5 PlentyChess 7.0.37       :    3675     10    7500  3121  3084  1295  62.2     100
   6 Obsidian 250706 a512     :    3640     10    7500  2773  3158  1569  58.0     100
   7 Alexandria 9.0 a512      :    3577     10    7500  2126  3262  2112  50.1      97
   8 Integral 250805 a512     :    3568     11    7500  2065  3220  2215  49.0     100
   9 Berserk 250606 a512      :    3533     10    7500  1720  3234  2546  44.5     100
  10 Viridithas 19.0 a512     :    3500     10    7500  1415  3224  2861  40.4     100
  11 Caissa 1.25 a512         :    3456     11    7500  1064  3111  3325  34.9     100
  12 KomodoDragon 3.3 avx2    :    3429     10    7500   913  2929  3658  31.7      58
  13 Clover 9.1 a512          :    3428     11    7500   881  2979  3640  31.6      96
  14 Halogen 16.0 a512        :    3420     10    7500   874  2862  3764  30.7     100
  15 Tarnished 5.0 a512       :    3406     11    7500   752  2861  3887  29.1     100
  16 Pawnocchio 1.9 a512      :    3389     10    7500   707  2668  4125  27.2     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 23002 (= 38.34%) 
--- Number of 1:1 drawn Gamepairs    : 11373 (= 18.95%) 
--- Number of 2-draws drawn Gamepairs: 11629 (= 19.38%) 
------------------------------------------------------------------- 

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, 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"...