Stefan Pohl Computer Chess

Latest Website-News (2026/09/15): Testrun of Triumviratus 7.0 AI finished: +24 Celo to Triumviratus 6.0. Interesting: In my EAS Ratinglist, Triumviratus 7.0 has the second best sacrifices-overall stat in the UHO-Top15 Ratinglist: Sacrifice in 18.29% of all won games. Only Torch is a little bit better here (19.07%), Stockfish 19 has achieved only 16.45% sacs...

 

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: Integral 8.0 and 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: 2026/09/15: Triumviratus 7.0 (+24 Celo to Triumviratus 6.0)

 

(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 260829        : 3905    4    4 15000    67.6%   3775   48.5%
   2 Stockfish 19 260905     : 3905    4    4 15000    67.5%   3775   48.8%
   3 Reckless 260502 a512    : 3829    4    4 15000    56.8%   3780   49.4%
   4 Torch 4d a512           : 3811    4    4 15000    54.2%   3781   49.5%
   5 PlentyChess 8.0.0       : 3806    4    4 15000    53.5%   3781   49.1%
   6 Pawnocchio 2.0 a512     : 3782    4    4 15000    50.0%   3783   49.7%
   7 Coda 0.9.4 AI           : 3780    4    4 15000    49.6%   3783   49.0%
   8 Cinder 6.0 a512         : 3775    4    4 15000    48.9%   3783   49.1%
   9 Obsidian 250706 a512    : 3766    4    4 15000    47.6%   3784   49.2%
  10 Viridithas 20.0 a512    : 3760    4    4 15000    46.6%   3785   49.6%
  11 Triumviratus 7.0 AI     : 3753    4    4 15000    45.7%   3785   50.7%
  12 Alexandria 9.0 a512     : 3738    4    4 15000    43.4%   3786   48.8%
  13 Integral 250805 a512    : 3735    4    4 15000    43.0%   3786   49.6%
  14 Stormphrax 8.0.0        : 3733    4    4 15000    42.6%   3786   48.9%
  15 Quanticade 260810       : 3731    4    4 15000    42.4%   3786   49.8%
  16 Hobbes 3.0 a512         : 3720    4    4 15000    40.8%   3787   49.6%

 

Games        : 120000 (finished)
White Wins   : 60108 (50.1 %)
Black Wins   : 699 (0.6 %)
Draws        : 59193 (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  5342  1996   162  84.5      58
   2 Stockfish 260829        :    3904     11    7500  5335  1997   168  84.4     100
   3 Reckless 260502 a512    :    3699     10    7500  3056  3392  1052  63.4     100
   4 Torch 4d a512           :    3659     10    7500  2629  3464  1407  58.1      99
   5 PlentyChess 8.0.0       :    3648     10    7500  2477  3547  1476  56.7     100
   6 Pawnocchio 2.0 a512     :    3597     10    7500  1947  3582  1971  49.8      91
   7 Coda 0.9.4 AI           :    3592     10    7500  1895  3575  2030  49.1      99
   8 Cinder 6.0 a512         :    3582     10    7500  1767  3639  2094  47.8     100
   9 Obsidian 250706 a512    :    3564     10    7500  1593  3608  2299  45.3     100
  10 Viridithas 20.0 a512    :    3548     10    7500  1420  3628  2452  43.1     100
  11 Triumviratus 7.0 AI     :    3537     10    7500  1355  3532  2613  41.6     100
  12 Alexandria 9.0 a512     :    3503     10    7500  1038  3489  2973  37.1      95
  13 Integral 250805 a512    :    3496     10    7500  1015  3395  3090  36.2      79
  14 Stormphrax 8.0.0        :    3492     10    7500   970  3416  3114  35.7      94
  15 Quanticade 260810       :    3486     10    7500   942  3347  3211  34.9     100
  16 Hobbes 3.0 a512         :    3465     10    7500   782  3267  3451  32.2     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 26437 (= 44.06%) 
--- Number of 1:1 drawn Gamepairs    : 13393 (= 22.32%) 
--- Number of 2-draws drawn Gamepairs: 13044 (= 21.74%) 
------------------------------------------------------------------- 

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"...