Stefan Pohl Computer Chess

Latest Website-News (2026/01/09): Testrun of Viridithas 19.0 finished: +37 Celo to Viridithas 18.0. The EAS-Score of Viridithas 19.0 (97k) is clearly better than Viridithas 18.0 (77k), but Viridithas is still at the bottom of the UHO-Top15 EAS-Ratinglist...

 

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 testruns: CS Tal Extreme and Reckless 260108 (new dev, taken from official GitHub)

 

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: 2026/01/09: Viridithas 19.0 (+37 Celo to Viridithas 18.0)

 

(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

Download all interesting wins (filtered by EAS-Tool) from the full UHO Ratinglist here

See the old SPCC-Ratinglist (full list) and EAS-List from 2020 until 2023/08/28: here

 

(best Stockfish Celo: Stockfish 260101: 3876 Celo, latest full release (Stockfish 17.1) had 3854 Celo)

     Program                     Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 260101 a512     : 3875    4    4 15000    68.0%   3740   48.5%
   2 Stockfish 17.1 250330     : 3854    4    4 15000    65.2%   3741   49.0%
   3 Torch 4a a512             : 3817    4    4 15000    60.0%   3744   49.6%
   4 Reckless 251212 a512      : 3807    4    4 15000    58.7%   3744   48.9%
   5 PlentyChess 7.0.37        : 3802    4    4 15000    57.9%   3745   48.2%
   6 Obsidian 250706 a512      : 3784    4    4 15000    55.3%   3746   50.4%
   7 Integral 250805 a512      : 3752    4    4 15000    50.7%   3748   50.2%
   8 Berserk 250606 a512       : 3736    4    4 15000    48.2%   3749   50.1%
   9 Alexandria 8.1.12 a512    : 3732    4    4 15000    47.6%   3749   50.2%
  10 Viridithas 19.0 a512      : 3725    4    4 15000    46.6%   3750   49.5%
  11 Caissa 1.24 a512          : 3692    4    4 15000    41.8%   3752   50.2%
  12 Clover 9.1 a512           : 3689    4    4 15000    41.4%   3752   50.3%
  13 KomodoDragon 3.3 avx2     : 3688    4    4 15000    41.3%   3752   49.5%
  14 Pawnocchio 1.9 a512       : 3678    4    4 15000    39.8%   3753   50.5%
  15 Quanticade 3.0 a512       : 3675    4    4 15000    39.4%   3753   47.7%
  16 Stormphrax 7.0 avx2       : 3666    4    4 15000    38.1%   3754   48.8%

 

Games        : 120000 (finished)
White Wins   : 59637 (49.7%)
Black Wins   : 982    (0.8%)
Draws        : 59381 (49.5%)

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 260101 a512     :    3919     10    7500  5449  1890   161  85.3     100
   2 Stockfish 17.1 250330     :    3854   ----    7500  4851  2280   369  79.9     100
   3 Torch 4a a512             :    3753      9    7500  3806  2843   851  69.7     100
   4 Reckless 251212 a512      :    3727      9    7500  3495  3021   984  66.7     100
   5 PlentyChess 7.0.37        :    3712     10    7500  3346  3057  1097  65.0     100
   6 Obsidian 250706 a512      :    3673     10    7500  2944  3165  1391  60.4     100
   7 Integral 250805 a512      :    3602     10    7500  2204  3289  2007  51.3     100
   8 Berserk 250606 a512       :    3562     10    7500  1824  3275  2401  46.2      94
   9 Alexandria 8.1.12 a512    :    3555     10    7500  1771  3248  2481  45.3     100
  10 Viridithas 19.0 a512      :    3541      9    7500  1609  3298  2593  43.4     100
  11 Caissa 1.24 a512          :    3467     10    7500  1034  3055  3411  34.2      83
  12 KomodoDragon 3.3 avx2     :    3462     10    7500  1038  2967  3495  33.6      84
  13 Clover 9.1 a512           :    3458     10    7500   979  3003  3518  33.1     100
  14 Pawnocchio 1.9 a512       :    3429     10    7500   779  2904  3817  29.7      65
  15 Quanticade 3.0 a512       :    3427      9    7500   776  2878  3846  29.5     100
  16 Stormphrax 7.0 avx2       :    3403     11    7500   621  2775  4104  26.8     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 23474 (= 39.12%) 
--- Number of 1:1 drawn Gamepairs    : 11694 (= 19.49%) 
--- Number of 2-draws drawn Gamepairs: 11780 (= 19.63%) 
------------------------------------------------------------------- 

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, Quanticade 2.0, Clarity 8

Below you find a diagram of the progress of Stockfish in my tests since February 2023. 

And below that diagram, the older diagrams.

 

You can save the diagrams on your PC with mouseclick (right button) and then choose "save image"...