Stefan Pohl Computer Chess

Latest Website-News (2026/09/16): Testrun of Integral 8.0 finished, huge progress: +47 Celo to Integral 250805 and +125 Celo to Integral 7.0.

 

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 260913

 

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: 2026/09/16: Integral 8.0 (+47 Celo to Integral 250805 and +125 Celo to Integral 7)

 

(Ordo-calculation fixed to Stockfish 19 = 3905 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 Decision Time 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 260829: 3907 Celo, latest full release (Stockfish 19) has 3905 Celo)

     Program                   Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 19 260905     : 3905    4    4 15000    67.3%   3777   48.8%
   2 Stockfish 260829        : 3905    4    4 15000    67.3%   3777   48.5%
   3 Reckless 260502 a512    : 3828    4    4 15000    56.4%   3782   49.4%
   4 Torch 4d a512           : 3809    4    4 15000    53.7%   3783   49.4%
   5 PlentyChess 8.0.0       : 3804    4    4 15000    53.0%   3783   49.0%
   6 Integral 8.0 a512       : 3782    4    4 15000    49.7%   3785   49.5%
   7 Pawnocchio 2.0 a512     : 3781    4    4 15000    49.5%   3785   49.7%
   8 Coda 0.9.4 AI           : 3778    4    4 15000    49.1%   3785   49.4%
   9 Cinder 6.0 a512         : 3773    4    4 15000    48.3%   3785   48.9%
  10 Obsidian 250706 a512    : 3765    4    4 15000    47.1%   3786   49.2%
  11 Viridithas 20.0 a512    : 3758    4    4 15000    46.1%   3786   49.8%
  12 Triumviratus 7.0 AI     : 3752    4    4 15000    45.2%   3787   50.7%
  13 Alexandria 9.0 a512     : 3736    4    4 15000    42.9%   3788   48.8%
  14 Stormphrax 8.0.0        : 3731    4    4 15000    42.1%   3788   49.0%
  15 Quanticade 260810       : 3729    4    4 15000    41.9%   3788   49.7%
  16 Hobbes 3.0 a512         : 3718    4    4 15000    40.2%   3789   49.5%

 

Games        : 120000 (finished)
White Wins   : 60130 (50.1%)
Black Wins   : 688    (0.6%)
Draws        : 59182 (49.3%)

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 19 260905     :    3905   ----    7500  5286  2048   166  84.1      70
   2 Stockfish 260829        :    3902     11    7500  5261  2063   176  83.9     100
   3 Reckless 260502 a512    :    3700     10    7500  2982  3428  1090  62.6     100
   4 Torch 4d a512           :    3659     10    7500  2547  3505  1448  57.3     100
   5 PlentyChess 8.0.0       :    3647     10    7500  2384  3583  1533  55.7     100
   6 Integral 8.0 a512       :    3602     10    7500  1893  3646  1961  49.5      85
   7 Pawnocchio 2.0 a512     :    3598      9    7500  1868  3613  2019  49.0      94
   8 Coda 0.9.4 AI           :    3592      9    7500  1796  3627  2077  48.1      99
   9 Cinder 6.0 a512         :    3581     10    7500  1681  3646  2173  46.7     100
  10 Obsidian 250706 a512    :    3564     10    7500  1506  3646  2348  44.4     100
  11 Viridithas 20.0 a512    :    3548     10    7500  1348  3630  2522  42.2     100
  12 Triumviratus 7.0 AI     :    3537     10    7500  1289  3519  2692  40.6     100
  13 Alexandria 9.0 a512     :    3502     10    7500   970  3458  3072  36.0      99
  14 Stormphrax 8.0.0        :    3491     10    7500   908  3379  3213  34.6      90
  15 Quanticade 260810       :    3486     10    7500   879  3334  3287  33.9     100
  16 Hobbes 3.0 a512         :    3464     10    7500   714  3251  3535  31.2     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 26688 (= 44.48%) 
--- Number of 1:1 drawn Gamepairs    : 13525 (= 22.54%) 
--- Number of 2-draws drawn Gamepairs: 13163 (= 21.94%) 
------------------------------------------------------------------- 

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

Icarus 1.1, Heimdall 1.5, Renegade 1.2.0, Igel 3.7.0, Minic 3.41, Booot 7.3, Black Marlin 9.0, Equisetum 1.0, Clarity 8, PZChessBot 7.1, Prune 4.0.1

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"...