Stefan Pohl Computer Chess

Latest Website-News (2026/11/05): VLTC Testrun of Triumviratus 261029 (vs. Stockfish 19) finished: -12 Celo to Stockfish 19 and -21 Celo to the latest SF-dev, tested here (SF 261025).

The result is included in the Stockfish VLTC testing. It will be deleted, if any other non-Stockfish engine is stronger than Triumviratus 261029. So, only 1 non-Stockfish result will be part of the Stockfish VLTC testing results. 

Next testrun: Triumviratus 261104

Stay tuned.

VLTC Stockfish testing (vs. latest Stockfish release)

Playing conditions:

The latest official Stockfish (Stockfish 19 right now), plays 3000 games versus the latest Stockfish dev with VLTC (30min+5sec, singlethread)

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 19: 500 kn/s (when 31 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 huge UHO_XXL_2022 openings (formerly used in Fishtest)(UHO 2022 openings are part of my Anti Draw Openings download-package). Each gamepair played with a randomly chosen opening.

Ponder, Large Memory Pages & learning: Off

Thinking time: 30min+5sec per game/engine. One testrun (3000 games) takes 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). 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).

Latest update: 2026/11/05: Triumviratus 261029

(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 full EAS-statistics file of Stockfish VLTC testing here

See the Decision Time statistics of Stockfish VLTC testing here

Download the gamebase of the Stockfish VLTC testing here

Download the old UHO-Top15 gamebase, the full-list gamebase and the archive here

(best Stockfish Celo: Stockfish 261025: 3914 Celo, latest full release (Stockfish 19) has 3905 Celo)

     Program                    Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 261025         : 3914    8    8  3000    51.3%   3905   64.4%
   2 Stockfish 261013         : 3908    8    8  3000    50.4%   3905   62.8%
   3 Stockfish 19 260905      : 3905    3    3 21000    54.3%   3875   63.9%
   4 Triumviratus 261029      : 3893    8    8  3000    48.3%   3905   64.9%
   5 Stockfish 18 260131      : 3875    8    8  3000    45.8%   3905   64.9%
   6 Stockfish 17.1 250530    : 3857    8    8  3000    43.2%   3905   64.3%
   7 Stockfish 17 240916      : 3846    8    8  3000    41.6%   3905   63.4%
   8 Stockfish 16.1 240224    : 3830    9    9  3000    39.5%   3905   62.4%

Games        : 21000 (finished)
White Wins   : 7563 (36.0%)
Black Wins   : 26    (0.1%)
Draws        : 13411 (63.9%)

Here the EAS-calculation of the Stockfish VLTC gamebase

                         early           bad  avg.win 
Rank  EAS-Score  sacs    sacs   shorts  draws  moves  Engine/player 
---------------------------------------------------------------------------
   1    180012  15.11%  36.00%  21.75%  21.04%   88   Stockfish 17.1 250530  
   2    179133  14.06%  37.14%  22.49%  22.88%   87   Stockfish 16.1 240224  
   3    166828  09.40%  36.28%  21.18%  19.71%   85   Stockfish 19 260905  
   4    166391  11.97%  40.35%  18.49%  16.80%   90   Triumviratus 261029  
   5    151420  10.25%  39.02%  17.25%  21.17%   88   Stockfish 18 260131  
   6    137201  10.49%  31.67%  18.71%  19.11%   88   Stockfish 261025  
   7    135613  12.42%  24.32%  23.83%  22.65%   87   Stockfish 17 240916  
   8    125197  09.98%  29.82%  15.94%  20.18%   87   Stockfish 261013  
-------------------------------------------------------------------
*** Average length of all won games:             87 moves
*** Movelimit for early sac bonus  :             43 moves

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"...